summaryrefslogtreecommitdiff
path: root/sql/wsrep_mysqld.cc
blob: 43e694f63677422a6d1689f16f54e1b122be36fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
/* Copyright (c) 2008, 2022 Codership Oy <http://www.codership.com>
   Copyright (c) 2020, 2022, MariaDB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.x1

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#include "sql_plugin.h"                         /* wsrep_plugins_pre_init() */
#include "my_global.h"
#include "wsrep_server_state.h"
#include "wsrep_status.h"

#include "mariadb.h"
#include <mysqld.h>
#include <transaction.h>
#include <sql_class.h>
#include <sql_parse.h>
#include <sql_base.h> /* find_temporary_table() */
#include <sql_statistics.h> /* is_stat_table() */
#include "slave.h"
#include "rpl_mi.h"
#include "sql_repl.h"
#include "rpl_filter.h"
#include "sql_callback.h"
#include "sp_head.h"
#include "sql_show.h"
#include "sp.h"
#include "handler.h"
#include "wsrep_priv.h"
#include "wsrep_thd.h"
#include "wsrep_sst.h"
#include "wsrep_utils.h"
#include "wsrep_var.h"
#include "wsrep_binlog.h"
#include "wsrep_applier.h"
#include "wsrep_schema.h"
#include "wsrep_xid.h"
#include "wsrep_trans_observer.h"
#include "mysql/service_wsrep.h"
#include <cstdio>
#include <cstdlib>
#include <string>
#include "log_event.h"
#include "sql_connect.h"
#include "thread_cache.h"

#include <sstream>

/* wsrep-lib */
Wsrep_server_state* Wsrep_server_state::m_instance;

my_bool wsrep_emulate_bin_log= FALSE; // activating parts of binlog interface
my_bool wsrep_preordered_opt= FALSE;

/* Streaming Replication */
const char *wsrep_fragment_units[]= { "bytes", "rows", "statements", NullS };
const char *wsrep_SR_store_types[]= { "none", "table", NullS };

/*
 * Begin configuration options
 */

extern my_bool plugins_are_initialized;

/* System variables. */
const char *wsrep_provider;
const char *wsrep_provider_options;
const char *wsrep_cluster_address;
const char *wsrep_cluster_name;
const char *wsrep_node_name;
const char *wsrep_node_address;
const char *wsrep_node_incoming_address;
const char *wsrep_start_position;
const char *wsrep_data_home_dir;
const char *wsrep_dbug_option;
const char *wsrep_notify_cmd;
const char *wsrep_status_file;
const char *wsrep_allowlist;

ulong   wsrep_debug;                            // Debug level logging
my_bool wsrep_convert_LOCK_to_trx;              // Convert locking sessions to trx
my_bool wsrep_auto_increment_control;           // Control auto increment variables
my_bool wsrep_drupal_282555_workaround;         // Retry autoinc insert after dupkey
my_bool wsrep_certify_nonPK;                    // Certify, even when no primary key
ulong   wsrep_certification_rules      = WSREP_CERTIFICATION_RULES_STRICT;
my_bool wsrep_recovery;                         // Recovery
my_bool wsrep_log_conflicts;
my_bool wsrep_load_data_splitting= 0;           // Commit load data every 10K intervals
my_bool wsrep_slave_UK_checks;                  // Slave thread does UK checks
my_bool wsrep_slave_FK_checks;                  // Slave thread does FK checks
my_bool wsrep_restart_slave;                    // Should mysql slave thread be
                                                // restarted, when node joins back?
my_bool wsrep_desync;                           // De(re)synchronize the node from the
                                                // cluster
ulonglong wsrep_mode;
bool wsrep_service_started;                     // If Galera was initialized
long wsrep_slave_threads;                       // No. of slave appliers threads
ulong wsrep_retry_autocommit;                   // Retry aborted autocommit trx
ulong wsrep_max_ws_size;                        // Max allowed ws (RBR buffer) size
ulong wsrep_max_ws_rows;                        // Max number of rows in ws
ulong wsrep_forced_binlog_format= BINLOG_FORMAT_UNSPEC;
ulong wsrep_mysql_replication_bundle;

bool              wsrep_gtid_mode;              // Enable WSREP native GTID support
Wsrep_gtid_server wsrep_gtid_server;
uint  wsrep_gtid_domain_id=0;                   // Domain id on above structure

/* Other configuration variables and their default values. */
my_bool wsrep_incremental_data_collection= 0;   // Incremental data collection
my_bool wsrep_restart_slave_activated= 0;       // Node has dropped, and slave
                                                // restart will be needed
bool wsrep_new_cluster= false;                  // Bootstrap the cluster?
int wsrep_slave_count_change= 0;                // No. of appliers to stop/start
int wsrep_to_isolation= 0;                      // No. of active TO isolation threads
long wsrep_max_protocol_version= 4;             // Maximum protocol version to use
long int  wsrep_protocol_version= wsrep_max_protocol_version;
ulong wsrep_trx_fragment_unit= WSREP_FRAG_BYTES;
                                                // unit for fragment size
ulong wsrep_SR_store_type= WSREP_SR_STORE_TABLE;
uint  wsrep_ignore_apply_errors= 0;

std::atomic <bool> wsrep_thread_create_failed;

/*
 * End configuration options
 */

/*
 * Cached variables
 */

// Whether the Galera write-set replication provider is set
// wsrep_provider && strcmp(wsrep_provider, WSREP_NONE)
bool WSREP_PROVIDER_EXISTS_;

// Whether the Galera write-set replication is enabled
// global_system_variables.wsrep_on && WSREP_PROVIDER_EXISTS_
bool WSREP_ON_;

/*
 * Other wsrep global variables.
 */

mysql_mutex_t LOCK_wsrep_ready;
mysql_cond_t  COND_wsrep_ready;
mysql_mutex_t LOCK_wsrep_sst;
mysql_cond_t  COND_wsrep_sst;
mysql_mutex_t LOCK_wsrep_sst_init;
mysql_cond_t  COND_wsrep_sst_init;
mysql_mutex_t LOCK_wsrep_replaying;
mysql_cond_t  COND_wsrep_replaying;
mysql_mutex_t LOCK_wsrep_slave_threads;
mysql_cond_t  COND_wsrep_slave_threads;
mysql_mutex_t LOCK_wsrep_gtid_wait_upto;
mysql_mutex_t LOCK_wsrep_cluster_config;
mysql_mutex_t LOCK_wsrep_desync;
mysql_mutex_t LOCK_wsrep_config_state;
mysql_mutex_t LOCK_wsrep_group_commit;
mysql_mutex_t LOCK_wsrep_SR_pool;
mysql_mutex_t LOCK_wsrep_SR_store;
mysql_mutex_t LOCK_wsrep_joiner_monitor;
mysql_mutex_t LOCK_wsrep_donor_monitor;
mysql_cond_t  COND_wsrep_joiner_monitor;
mysql_cond_t  COND_wsrep_donor_monitor;

int wsrep_replaying= 0;
ulong  wsrep_running_threads = 0; // # of currently running wsrep
				  // # threads
ulong  wsrep_running_applier_threads = 0; // # of running applier threads
ulong  wsrep_running_rollbacker_threads = 0; // # of running
					     // # rollbacker threads
ulong  my_bind_addr;

#ifdef HAVE_PSI_INTERFACE
PSI_mutex_key
  key_LOCK_wsrep_replaying, key_LOCK_wsrep_ready, key_LOCK_wsrep_sst,
  key_LOCK_wsrep_sst_thread, key_LOCK_wsrep_sst_init,
  key_LOCK_wsrep_slave_threads, key_LOCK_wsrep_gtid_wait_upto,
  key_LOCK_wsrep_desync,
  key_LOCK_wsrep_config_state, key_LOCK_wsrep_cluster_config,
  key_LOCK_wsrep_group_commit,
  key_LOCK_wsrep_SR_pool,
  key_LOCK_wsrep_SR_store,
  key_LOCK_wsrep_thd_queue,
  key_LOCK_wsrep_joiner_monitor,
  key_LOCK_wsrep_donor_monitor;

PSI_cond_key key_COND_wsrep_thd,
  key_COND_wsrep_replaying, key_COND_wsrep_ready, key_COND_wsrep_sst,
  key_COND_wsrep_sst_init, key_COND_wsrep_sst_thread,
  key_COND_wsrep_thd_queue, key_COND_wsrep_slave_threads, key_COND_wsrep_gtid_wait_upto,
  key_COND_wsrep_joiner_monitor, key_COND_wsrep_donor_monitor;

PSI_file_key key_file_wsrep_gra_log;

static PSI_mutex_info wsrep_mutexes[]=
{
  { &key_LOCK_wsrep_ready, "LOCK_wsrep_ready", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_sst, "LOCK_wsrep_sst", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_sst_thread, "wsrep_sst_thread", 0},
  { &key_LOCK_wsrep_sst_init, "LOCK_wsrep_sst_init", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_sst, "LOCK_wsrep_sst", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_replaying, "LOCK_wsrep_replaying", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_slave_threads, "LOCK_wsrep_slave_threads", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_gtid_wait_upto, "LOCK_wsrep_gtid_wait_upto", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_cluster_config, "LOCK_wsrep_cluster_config", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_desync, "LOCK_wsrep_desync", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_config_state, "LOCK_wsrep_config_state", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_group_commit, "LOCK_wsrep_group_commit", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_SR_pool, "LOCK_wsrep_SR_pool", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_SR_store, "LOCK_wsrep_SR_store", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_joiner_monitor, "LOCK_wsrep_joiner_monitor", PSI_FLAG_GLOBAL},
  { &key_LOCK_wsrep_donor_monitor, "LOCK_wsrep_donor_monitor", PSI_FLAG_GLOBAL}
};

static PSI_cond_info wsrep_conds[]=
{
  { &key_COND_wsrep_ready, "COND_wsrep_ready", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_sst, "COND_wsrep_sst", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_sst_init, "COND_wsrep_sst_init", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_sst_thread, "wsrep_sst_thread", 0},
  { &key_COND_wsrep_thd, "THD::COND_wsrep_thd", 0},
  { &key_COND_wsrep_replaying, "COND_wsrep_replaying", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_slave_threads, "COND_wsrep_wsrep_slave_threads", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_gtid_wait_upto, "COND_wsrep_gtid_wait_upto", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_joiner_monitor, "COND_wsrep_joiner_monitor", PSI_FLAG_GLOBAL},
  { &key_COND_wsrep_donor_monitor, "COND_wsrep_donor_monitor", PSI_FLAG_GLOBAL}
};

static PSI_file_info wsrep_files[]=
{
  { &key_file_wsrep_gra_log, "wsrep_gra_log", 0}
};

PSI_thread_key key_wsrep_sst_joiner, key_wsrep_sst_donor,
  key_wsrep_rollbacker, key_wsrep_applier,
  key_wsrep_sst_joiner_monitor, key_wsrep_sst_donor_monitor;

static PSI_thread_info wsrep_threads[]=
{
 {&key_wsrep_sst_joiner, "wsrep_sst_joiner_thread", PSI_FLAG_GLOBAL},
 {&key_wsrep_sst_donor, "wsrep_sst_donor_thread", PSI_FLAG_GLOBAL},
 {&key_wsrep_rollbacker, "wsrep_rollbacker_thread", PSI_FLAG_GLOBAL},
 {&key_wsrep_applier, "wsrep_applier_thread", PSI_FLAG_GLOBAL},
 {&key_wsrep_sst_joiner_monitor, "wsrep_sst_joiner_monitor", PSI_FLAG_GLOBAL},
 {&key_wsrep_sst_donor_monitor, "wsrep_sst_donor_monitor", PSI_FLAG_GLOBAL}
};

#endif /* HAVE_PSI_INTERFACE */

my_bool wsrep_inited= 0; // initialized ?

static wsrep_uuid_t node_uuid= WSREP_UUID_UNDEFINED;
static char         cluster_uuid_str[40]= { 0, };

static char provider_name[256]= { 0, };
static char provider_version[256]= { 0, };
static char provider_vendor[256]= { 0, };

/*
 * Wsrep status variables. LOCK_status must be locked When modifying
 * these variables,
 */
my_bool     wsrep_connected         = FALSE;
my_bool     wsrep_ready             = FALSE;
const char* wsrep_cluster_state_uuid= cluster_uuid_str;
long long   wsrep_cluster_conf_id   = WSREP_SEQNO_UNDEFINED;
const char* wsrep_cluster_status    = "Disconnected";
long        wsrep_cluster_size      = 0;
long        wsrep_local_index       = -1;
long long   wsrep_local_bf_aborts   = 0;
const char* wsrep_provider_name     = provider_name;
const char* wsrep_provider_version  = provider_version;
const char* wsrep_provider_vendor   = provider_vendor;
char* wsrep_provider_capabilities   = NULL;
char* wsrep_cluster_capabilities    = NULL;
/* End wsrep status variables */

wsp::Config_state *wsrep_config_state;

void WSREP_LOG(void (*fun)(const char* fmt, ...), const char* fmt, ...)
{
  /* Allocate short buffer from stack. If the vsnprintf() return value
     indicates that the message was truncated, a new buffer will be allocated
     dynamically and the message will be reprinted. */
  char msg[128] = {'\0'};
  va_list arglist;
  va_start(arglist, fmt);
  int n= vsnprintf(msg, sizeof(msg), fmt, arglist);
  va_end(arglist);
  if (n < 0)
  {
    sql_print_warning("WSREP: Printing message failed");
  }
  else if (n < (int)sizeof(msg))
  {
    fun("WSREP: %s", msg);
  }
  else
  {
    size_t dynbuf_size= std::max(n, 4096);
    char* dynbuf= (char*) my_malloc(PSI_NOT_INSTRUMENTED, dynbuf_size, MYF(0));
    if (dynbuf)
    {
      va_start(arglist, fmt);
      (void)vsnprintf(&dynbuf[0], dynbuf_size - 1, fmt, arglist);
      va_end(arglist);
      dynbuf[dynbuf_size - 1] = '\0';
      fun("WSREP: %s", &dynbuf[0]);
      my_free(dynbuf);
    }
    else
    {
      /* Memory allocation for vector failed, print truncated message. */
      fun("WSREP: %s", msg);
    }
  }
}


wsrep_uuid_t               local_uuid       = WSREP_UUID_UNDEFINED;
wsrep_seqno_t              local_seqno      = WSREP_SEQNO_UNDEFINED;

/*
 */
Wsrep_schema *wsrep_schema= 0;

static void wsrep_log_cb(wsrep::log::level level,
                         const char*, const char *msg)
{
  /*
    Silence all wsrep related logging from lib and provider if
    wsrep is not enabled.
  */
  if (!WSREP_ON) return;

  switch (level) {
  case wsrep::log::info:
    WSREP_INFO("%s", msg);
    break;
  case wsrep::log::warning:
    WSREP_WARN("%s", msg);
    break;
  case wsrep::log::error:
    WSREP_ERROR("%s", msg);
    break;
  case wsrep::log::debug:
    WSREP_DEBUG("%s", msg);
    break;
  case wsrep::log::unknown:
    WSREP_UNKNOWN("%s", msg);
    break;
  }
}

void wsrep_init_gtid()
{
  wsrep_server_gtid_t stored_gtid= wsrep_get_SE_checkpoint<wsrep_server_gtid_t>();
  if (stored_gtid.server_id == 0)
  {
    rpl_gtid wsrep_last_gtid;
    stored_gtid.domain_id= wsrep_gtid_server.domain_id;
    if (mysql_bin_log.is_open() &&
        mysql_bin_log.lookup_domain_in_binlog_state(stored_gtid.domain_id,
                                                    &wsrep_last_gtid))
    {
      stored_gtid.server_id= wsrep_last_gtid.server_id;
      stored_gtid.seqno= wsrep_last_gtid.seq_no;
    }
    else
    {
      stored_gtid.server_id= global_system_variables.server_id;
      stored_gtid.seqno= 0;
    }
  }
  wsrep_gtid_server.gtid(stored_gtid);
}

bool wsrep_get_binlog_gtid_seqno(wsrep_server_gtid_t& gtid)
{
  rpl_gtid binlog_gtid;
  int ret= 0;
  if (mysql_bin_log.is_open() &&
      mysql_bin_log.find_in_binlog_state(gtid.domain_id,
                                         gtid.server_id,
                                         &binlog_gtid))
  {
    gtid.domain_id= binlog_gtid.domain_id;
    gtid.server_id= binlog_gtid.server_id;
    gtid.seqno=     binlog_gtid.seq_no;
    ret= 1;
  }
  return ret;
}

bool wsrep_check_gtid_seqno(const uint32& domain, const uint32& server,
                            uint64& seqno)
{
  if (domain == wsrep_gtid_server.domain_id && 
      server == wsrep_gtid_server.server_id)
  {
    if (wsrep_gtid_server.seqno_committed() < seqno) return 1;
    return 0;
  }
  return 0;
}

void wsrep_init_sidno(const wsrep::id& uuid)
{
  /*
    Protocol versions starting from 4 use group gtid as it is.
    For lesser protocol versions generate new Sid map entry from inverted
    uuid.
  */
  rpl_gtid sid;
  if (wsrep_protocol_version >= 4)
  {
    memcpy((void*)&sid, (const uchar*)uuid.data(),16);
  }
  else
  {
    wsrep_uuid_t ltid_uuid;
    for (size_t i= 0; i < sizeof(ltid_uuid.data); ++i)
    {
      ltid_uuid.data[i]= ~((const uchar*)uuid.data())[i];
    }
    memcpy((void*)&sid, (const uchar*)ltid_uuid.data,16);
  }
#ifdef GTID_SUPPORT
  global_sid_lock->wrlock();
  wsrep_sidno= global_sid_map->add_sid(sid);
  WSREP_INFO("Initialized wsrep sidno %d", wsrep_sidno);
  global_sid_lock->unlock();
#endif
}

void wsrep_init_schema()
{
  DBUG_ASSERT(!wsrep_schema);

  WSREP_INFO("wsrep_init_schema_and_SR %p", wsrep_schema);
  if (!wsrep_schema)
  {
    wsrep_schema= new Wsrep_schema();
    if (wsrep_schema->init())
    {
      WSREP_ERROR("Failed to init wsrep schema");
      unireg_abort(1);
    }
    // If we are bootstraping new cluster we should 
    // clear allowlist table and populate it from variable
    if (wsrep_new_cluster) 
    {
      wsrep_schema->clear_allowlist();
      std::vector<std::string> ip_allowlist;
      if (wsrep_split_allowlist(ip_allowlist))
      {
        wsrep_schema->store_allowlist(ip_allowlist);
      }
    }
  }
}

void wsrep_deinit_schema()
{
  delete wsrep_schema;
  wsrep_schema= 0;
}

void wsrep_recover_sr_from_storage(THD *orig_thd)
{
  switch (wsrep_SR_store_type)
  {
  case WSREP_SR_STORE_TABLE:
    if (!wsrep_schema)
    {
      WSREP_ERROR("Wsrep schema not initialized when trying to recover "
                  "streaming transactions: wsrep_on %d", WSREP_ON);
      trans_commit(orig_thd);
    }
    if (wsrep_schema->recover_sr_transactions(orig_thd))
    {
      WSREP_ERROR("Failed to recover SR transactions from schema: wsrep_on : %d", WSREP_ON);
      trans_commit(orig_thd);
    }
    break;
  default:
    /* */
    WSREP_ERROR("Unsupported wsrep SR store type: %lu wsrep_on: %d",
                wsrep_SR_store_type, WSREP_ON);
    trans_commit(orig_thd);
    break;
  }
}

/** Export the WSREP provider's capabilities as a human readable string.
 * The result is saved in a dynamically allocated string of the form:
 * :cap1:cap2:cap3:
 */
static void wsrep_capabilities_export(wsrep_cap_t const cap, char** str)
{
  static const char* names[] =
  {
    /* Keep in sync with wsrep/wsrep_api.h WSREP_CAP_* macros. */
    "MULTI_MASTER",
    "CERTIFICATION",
    "PARALLEL_APPLYING",
    "TRX_REPLAY",
    "ISOLATION",
    "PAUSE",
    "CAUSAL_READS",
    "CAUSAL_TRX",
    "INCREMENTAL_WRITESET",
    "SESSION_LOCKS",
    "DISTRIBUTED_LOCKS",
    "CONSISTENCY_CHECK",
    "UNORDERED",
    "ANNOTATION",
    "PREORDERED",
    "STREAMING",
    "SNAPSHOT",
    "NBO",
  };

  std::string s;
  for (size_t i= 0; i < sizeof(names) / sizeof(names[0]); ++i)
  {
    if (cap & (1ULL << i))
    {
      if (s.empty())
      {
        s= ":";
      }
      s += names[i];
      s += ":";
    }
  }

  /* A read from the string pointed to by *str may be started at any time,
   * so it must never point to free(3)d memory or non '\0' terminated string. */

  char* const previous= *str;

  *str= strdup(s.c_str());

  if (previous != NULL)
  {
    free(previous);
  }
}

/* Verifies that SE position is consistent with the group position
 * and initializes other variables */
void wsrep_verify_SE_checkpoint(const wsrep_uuid_t& uuid,
                                wsrep_seqno_t const seqno)
{
}

/*
  Wsrep is considered ready if
  1) Provider is not loaded (native mode)
  2) Server has reached synced state
  3) Server is in joiner mode and mysqldump SST method has been
     specified
  See Wsrep_server_service::log_state_change() for further details.
 */
my_bool wsrep_ready_get (void)
{
  if (mysql_mutex_lock (&LOCK_wsrep_ready)) abort();
  my_bool ret= wsrep_ready;
  mysql_mutex_unlock (&LOCK_wsrep_ready);
  return ret;
}

int wsrep_show_ready(THD *thd, SHOW_VAR *var, char *buff)
{
  var->type= SHOW_MY_BOOL;
  var->value= buff;
  *((my_bool *)buff)= wsrep_ready_get();
  return 0;
}

void wsrep_update_cluster_state_uuid(const char* uuid)
{
  strncpy(cluster_uuid_str, uuid, sizeof(cluster_uuid_str) - 1);
}

static void wsrep_init_position()
{
}

/****************************************************************************
                         Helpers for wsrep_init()
 ****************************************************************************/
static std::string wsrep_server_name()
{
  std::string ret(wsrep_node_name ? wsrep_node_name : "");
  return ret;
}

static std::string wsrep_server_id()
{
  /* using empty server_id, which enables view change handler to
     set final server_id later on
  */
  std::string ret("");
  return ret;
}

static std::string wsrep_server_node_address()
{

  std::string ret;
  if (!wsrep_data_home_dir || strlen(wsrep_data_home_dir) == 0)
    wsrep_data_home_dir= mysql_real_data_home;

  /* Initialize node address */
  if (!wsrep_node_address || !strcmp(wsrep_node_address, ""))
  {
    char node_addr[512]= {0, };
    const size_t node_addr_max= sizeof(node_addr) - 1;
    size_t guess_ip_ret= wsrep_guess_ip(node_addr, node_addr_max);
    if (!(guess_ip_ret > 0 && guess_ip_ret < node_addr_max))
    {
      WSREP_WARN("Failed to guess base node address. Set it explicitly via "
                 "wsrep_node_address.");
    }
    else
    {
      ret= node_addr;
    }
  }
  else
  {
    ret= wsrep_node_address;
  }
  return ret;
}

static std::string wsrep_server_incoming_address()
{
  std::string ret;
  const std::string node_addr(wsrep_server_node_address());
  char inc_addr[512]= { 0, };
  size_t const inc_addr_max= sizeof (inc_addr);

  /*
    In case wsrep_node_incoming_address is either not set or set to AUTO,
    we need to use mysqld's my_bind_addr_str:mysqld_port, lastly fallback
    to wsrep_node_address' value if mysqld's bind-address is not set either.
  */
  if ((!wsrep_node_incoming_address ||
       !strcmp (wsrep_node_incoming_address, WSREP_NODE_INCOMING_AUTO)))
  {
    bool is_ipv6= false;
    unsigned int my_bind_ip= INADDR_ANY; // default if not set

    if (my_bind_addr_str && strlen(my_bind_addr_str) &&
        strcmp(my_bind_addr_str, "*") != 0)
    {
      my_bind_ip= wsrep_check_ip(my_bind_addr_str, &is_ipv6);
    }

    if (INADDR_ANY != my_bind_ip)
    {
      /*
        If its a not a valid address, leave inc_addr as empty string. mysqld
        is not listening for client connections on network interfaces.
      */
      if (INADDR_NONE != my_bind_ip && INADDR_LOOPBACK != my_bind_ip)
      {
        const char *fmt= (is_ipv6) ? "[%s]:%u" : "%s:%u";
        snprintf(inc_addr, inc_addr_max, fmt, my_bind_addr_str, mysqld_port);
      }
    }
    else /* mysqld binds to 0.0.0.0, try taking IP from wsrep_node_address. */
    {
      if (node_addr.size())
      {
        size_t const ip_len_mdb= wsrep_host_len(node_addr.c_str(), node_addr.size());
        if (ip_len_mdb + 7 /* :55555\0 */ < inc_addr_max)
        {
          memcpy (inc_addr, node_addr.c_str(), ip_len_mdb);
          snprintf(inc_addr + ip_len_mdb, inc_addr_max - ip_len_mdb, ":%u",
                   (int)mysqld_port);
        }
        else
        {
          WSREP_WARN("Guessing address for incoming client connections: "
                     "address too long.");
          inc_addr[0]= '\0';
        }
      }

      if (!strlen(inc_addr))
      {
        WSREP_WARN("Guessing address for incoming client connections failed. "
                   "Try setting wsrep_node_incoming_address explicitly.");
        WSREP_INFO("Node addr: %s", node_addr.c_str());
      }
    }
  }
  else
  {
    wsp::Address addr(wsrep_node_incoming_address);

    if (!addr.is_valid())
    {
      WSREP_WARN("Could not parse wsrep_node_incoming_address : %s",
                 wsrep_node_incoming_address);
      goto done;
    }

    /*
      In case port is not specified in wsrep_node_incoming_address, we use
      mysqld_port.
      Note that we might get here before we execute set_ports().
    */
    int local_port= (addr.get_port() > 0) ? addr.get_port() : (int) mysqld_port;
    if (!local_port)
      local_port= MYSQL_PORT;
    const char *fmt= (addr.is_ipv6()) ? "[%s]:%u" : "%s:%u";

    snprintf(inc_addr, inc_addr_max, fmt, addr.get_address(), local_port);
  }

 done:
  if (!strlen(inc_addr))
    ret= wsrep_node_incoming_address;
  else
    ret= inc_addr;
  WSREP_DEBUG("wsrep_incoming_address = %s", ret.c_str());
  return ret;
}

static std::string wsrep_server_working_dir()
{
  std::string ret;
  if (!wsrep_data_home_dir || strlen(wsrep_data_home_dir) == 0)
  {
    ret= mysql_real_data_home;
  }
  else
  {
    ret= wsrep_data_home_dir;
  }
  return ret;
}

static wsrep::gtid wsrep_server_initial_position()
{
  wsrep::gtid ret;
  WSREP_DEBUG("Server initial position: %s", wsrep_start_position);
  std::istringstream is(wsrep_start_position);
  is >> ret;
  return ret;
}

/*
  Intitialize provider specific status variables
 */
static void wsrep_init_provider_status_variables()
{
  wsrep_inited= 1;
  const wsrep::provider& provider=
    Wsrep_server_state::instance().provider();
  strncpy(provider_name,
          provider.name().c_str(),    sizeof(provider_name) - 1);
  strncpy(provider_version,
          provider.version().c_str(), sizeof(provider_version) - 1);
  strncpy(provider_vendor,
          provider.vendor().c_str(),  sizeof(provider_vendor) - 1);
}

int wsrep_init_server()
{
  wsrep::log::logger_fn(wsrep_log_cb);
  try
  {
    Wsrep_status::init_once(wsrep_status_file);

    std::string server_name;
    std::string server_id;
    std::string node_address;
    std::string incoming_address;
    std::string working_dir;
    wsrep::gtid initial_position;

    server_name= wsrep_server_name();
    server_id= wsrep_server_id();
    node_address= wsrep_server_node_address();
    incoming_address= wsrep_server_incoming_address();
    working_dir= wsrep_server_working_dir();
    initial_position= wsrep_server_initial_position();

    Wsrep_server_state::init_once(server_name,
                                  incoming_address,
                                  node_address,
                                  working_dir,
                                  initial_position,
                                  wsrep_max_protocol_version);
    Wsrep_server_state::instance().debug_log_level(wsrep_debug);
  }
  catch (const wsrep::runtime_error& e)
  {
    WSREP_ERROR("Failed to init wsrep server %s", e.what());
    return 1;
  }
  catch (const std::exception& e)
  {
    WSREP_ERROR("Failed to init wsrep server %s", e.what());
  }
  return 0;
}

void wsrep_init_globals()
{
  wsrep_init_sidno(Wsrep_server_state::instance().connected_gtid().id());
  /* Recover last written wsrep gtid */
  wsrep_init_gtid();
  if (wsrep_new_cluster)
  {
    /* Start with provided domain_id & server_id found in configuration */
    wsrep_server_gtid_t new_gtid;
    new_gtid.domain_id= wsrep_gtid_domain_id;
    new_gtid.server_id= global_system_variables.server_id;
    new_gtid.seqno= 0;
    /* Try to search for domain_id and server_id combination in binlog if found continue from last seqno */
    wsrep_get_binlog_gtid_seqno(new_gtid);
    wsrep_gtid_server.gtid(new_gtid);
  }
  else
  {
    if (wsrep_gtid_mode && wsrep_gtid_server.server_id != global_system_variables.server_id)
    {
      WSREP_WARN("Ignoring server id for non bootstrap node.");
    }
  }
  wsrep_init_schema();
  if (WSREP_ON)
  {
    Wsrep_server_state::instance().initialized();
  }
}

void wsrep_deinit_server()
{
  wsrep_deinit_schema();
  Wsrep_server_state::destroy();
  Wsrep_status::destroy();
}

int wsrep_init()
{
  assert(wsrep_provider);

  wsrep_init_position();
  wsrep_sst_auth_init();

  if (strlen(wsrep_provider)== 0 ||
      !strcmp(wsrep_provider, WSREP_NONE))
  {
    // enable normal operation in case no provider is specified
    global_system_variables.wsrep_on= 0;
    int err= Wsrep_server_state::instance().load_provider(wsrep_provider, wsrep_provider_options ? wsrep_provider_options : "");
    if (err)
    {
      DBUG_PRINT("wsrep",("wsrep::init() failed: %d", err));
      WSREP_ERROR("wsrep::init() failed: %d, must shutdown", err);
    }
    else
      wsrep_init_provider_status_variables();
    return err;
  }

  if (wsrep_gtid_mode && opt_bin_log && !opt_log_slave_updates)
  {
    WSREP_ERROR("Option --log-slave-updates is required if "
                "binlog is enabled, GTID mode is on and wsrep provider "
                "is specified");
    return 1;
  }

  if (!wsrep_data_home_dir || strlen(wsrep_data_home_dir) == 0)
    wsrep_data_home_dir= mysql_real_data_home;

  Wsrep_server_state::init_provider_services();
  if (Wsrep_server_state::instance().load_provider(
      wsrep_provider,
      wsrep_provider_options,
      Wsrep_server_state::instance().provider_services()))
  {
    WSREP_ERROR("Failed to load provider");
    Wsrep_server_state::deinit_provider_services();
    return 1;
  }

  if (!wsrep_provider_is_SR_capable() &&
      global_system_variables.wsrep_trx_fragment_size > 0)
  {
    WSREP_ERROR("The WSREP provider (%s) does not support streaming "
                "replication but wsrep_trx_fragment_size is set to a "
                "value other than 0 (%llu). Cannot continue. Either set "
                "wsrep_trx_fragment_size to 0 or use wsrep_provider that "
                "supports streaming replication.",
                wsrep_provider, global_system_variables.wsrep_trx_fragment_size);
    Wsrep_server_state::instance().unload_provider();
    Wsrep_server_state::deinit_provider_services();
    return 1;
  }

  /* Now WSREP is fully initialized */
  global_system_variables.wsrep_on= 1;
  WSREP_ON_= wsrep_provider && strcmp(wsrep_provider, WSREP_NONE);
  wsrep_service_started= 1;

  wsrep_init_provider_status_variables();
  wsrep_capabilities_export(Wsrep_server_state::instance().provider().capabilities(),
                            &wsrep_provider_capabilities);

  WSREP_DEBUG("SR storage init for: %s",
              (wsrep_SR_store_type == WSREP_SR_STORE_TABLE) ? "table" : "void");

  return 0;
}

/* Initialize wsrep thread LOCKs and CONDs */
void wsrep_thr_init()
{
  DBUG_ENTER("wsrep_thr_init");
  wsrep_config_state= new wsp::Config_state;
#ifdef HAVE_PSI_INTERFACE
  mysql_mutex_register("sql", wsrep_mutexes, array_elements(wsrep_mutexes));
  mysql_cond_register("sql", wsrep_conds, array_elements(wsrep_conds));
  mysql_file_register("sql", wsrep_files, array_elements(wsrep_files));
  mysql_thread_register("sql", wsrep_threads, array_elements(wsrep_threads));
#endif

  mysql_mutex_init(key_LOCK_wsrep_ready, &LOCK_wsrep_ready, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_ready, &COND_wsrep_ready, NULL);
  mysql_mutex_init(key_LOCK_wsrep_sst, &LOCK_wsrep_sst, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_sst, &COND_wsrep_sst, NULL);
  mysql_mutex_init(key_LOCK_wsrep_sst_init, &LOCK_wsrep_sst_init, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_sst_init, &COND_wsrep_sst_init, NULL);
  mysql_mutex_init(key_LOCK_wsrep_replaying, &LOCK_wsrep_replaying, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_replaying, &COND_wsrep_replaying, NULL);
  mysql_mutex_init(key_LOCK_wsrep_slave_threads, &LOCK_wsrep_slave_threads, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_slave_threads, &COND_wsrep_slave_threads, NULL);
  mysql_mutex_init(key_LOCK_wsrep_gtid_wait_upto, &LOCK_wsrep_gtid_wait_upto, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_cluster_config, &LOCK_wsrep_cluster_config, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_desync, &LOCK_wsrep_desync, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_config_state, &LOCK_wsrep_config_state, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_group_commit, &LOCK_wsrep_group_commit, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_SR_pool,
                   &LOCK_wsrep_SR_pool, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_SR_store,
                   &LOCK_wsrep_SR_store, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_joiner_monitor,
                   &LOCK_wsrep_joiner_monitor, MY_MUTEX_INIT_FAST);
  mysql_mutex_init(key_LOCK_wsrep_donor_monitor,
                   &LOCK_wsrep_donor_monitor, MY_MUTEX_INIT_FAST);
  mysql_cond_init(key_COND_wsrep_joiner_monitor, &COND_wsrep_joiner_monitor, NULL);
  mysql_cond_init(key_COND_wsrep_donor_monitor, &COND_wsrep_donor_monitor, NULL);

  DBUG_VOID_RETURN;
}

void wsrep_init_startup (bool sst_first)
{
  if (wsrep_init()) unireg_abort(1);

  /*
    Pre-initialize global_system_variables.table_plugin with a dummy engine
    (placeholder) required during the initialization of wsrep threads (THDs).
    (see: plugin_thdvar_init())
    Note: This only needs to be done for rsync & mariabackup based SST methods.
    In case of mysqldump SST method, the wsrep threads are created after the
    server plugins & global system variables are initialized.
  */
  if (wsrep_before_SE())
    wsrep_plugins_pre_init();

  /* Skip replication start if dummy wsrep provider is loaded */
  if (!strcmp(wsrep_provider, WSREP_NONE)) return;

  /* Skip replication start if no cluster address */
  if (!wsrep_cluster_address_exists()) return;

  /*
    Read value of wsrep_new_cluster before wsrep_start_replication(),
    the value is reset to FALSE inside wsrep_start_replication.
  */
  if (!wsrep_start_replication(wsrep_cluster_address)) unireg_abort(1);

  wsrep_create_rollbacker();
  wsrep_create_appliers(1);

  Wsrep_server_state& server_state= Wsrep_server_state::instance();
  /*
    If the SST happens before server initialization, wait until the server
    state reaches initializing. This indicates that
    either SST was not necessary or SST has been delivered.

    With mysqldump SST (!sst_first) wait until the server reaches
    joiner state and procedd to accepting connections.
  */
  if (sst_first)
  {
    server_state.wait_until_state(Wsrep_server_state::s_initializing);
  }
  else
  {
    server_state.wait_until_state(Wsrep_server_state::s_joiner);
  }
}


void wsrep_deinit(bool free_options)
{
  DBUG_ASSERT(wsrep_inited == 1);
  WSREP_DEBUG("wsrep_deinit");

  Wsrep_server_state::instance().unload_provider();
  Wsrep_server_state::deinit_provider_services();

  provider_name[0]=    '\0';
  provider_version[0]= '\0';
  provider_vendor[0]=  '\0';

  wsrep_inited= 0;

  if (wsrep_provider_capabilities != NULL)
  {
    char* p= wsrep_provider_capabilities;
    wsrep_provider_capabilities= NULL;
    free(p);
  }

  if (free_options)
  {
    wsrep_sst_auth_free();
  }
}

/* Destroy wsrep thread LOCKs and CONDs */
void wsrep_thr_deinit()
{
  if (!wsrep_config_state)
    return;                                     // Never initialized
  WSREP_DEBUG("wsrep_thr_deinit");
  mysql_mutex_destroy(&LOCK_wsrep_ready);
  mysql_cond_destroy(&COND_wsrep_ready);
  mysql_mutex_destroy(&LOCK_wsrep_sst);
  mysql_cond_destroy(&COND_wsrep_sst);
  mysql_mutex_destroy(&LOCK_wsrep_sst_init);
  mysql_cond_destroy(&COND_wsrep_sst_init);
  mysql_mutex_destroy(&LOCK_wsrep_replaying);
  mysql_cond_destroy(&COND_wsrep_replaying);
  mysql_mutex_destroy(&LOCK_wsrep_gtid_wait_upto);
  mysql_mutex_destroy(&LOCK_wsrep_slave_threads);
  mysql_cond_destroy(&COND_wsrep_slave_threads);
  mysql_mutex_destroy(&LOCK_wsrep_cluster_config);
  mysql_mutex_destroy(&LOCK_wsrep_desync);
  mysql_mutex_destroy(&LOCK_wsrep_config_state);
  mysql_mutex_destroy(&LOCK_wsrep_group_commit);
  mysql_mutex_destroy(&LOCK_wsrep_SR_pool);
  mysql_mutex_destroy(&LOCK_wsrep_SR_store);
  mysql_mutex_destroy(&LOCK_wsrep_joiner_monitor);
  mysql_mutex_destroy(&LOCK_wsrep_donor_monitor);
  mysql_cond_destroy(&COND_wsrep_joiner_monitor);
  mysql_cond_destroy(&COND_wsrep_donor_monitor);

  delete wsrep_config_state;
  wsrep_config_state= 0;                        // Safety

  if (wsrep_cluster_capabilities != NULL)
  {
    char* p= wsrep_cluster_capabilities;
    wsrep_cluster_capabilities= NULL;
    free(p);
  }
}

void wsrep_recover()
{
  char uuid_str[40];

  if (wsrep_uuid_compare(&local_uuid, &WSREP_UUID_UNDEFINED) == 0 &&
      local_seqno == -2)
  {
    wsrep_uuid_print(&local_uuid, uuid_str, sizeof(uuid_str));
    WSREP_INFO("Position %s:%lld given at startup, skipping position recovery",
               uuid_str, (long long)local_seqno);
    return;
  }
  wsrep::gtid gtid= wsrep_get_SE_checkpoint<wsrep::gtid>();
  std::ostringstream oss;
  oss << gtid;
  if (wsrep_gtid_mode)
  {
    wsrep_server_gtid_t server_gtid=  wsrep_get_SE_checkpoint<wsrep_server_gtid_t>();
    WSREP_INFO("Recovered position: %s,%d-%d-%llu", oss.str().c_str(), server_gtid.domain_id,
                server_gtid.server_id, server_gtid.seqno);
  }
  else
  {
    WSREP_INFO("Recovered position: %s", oss.str().c_str());
  }
}


void wsrep_stop_replication(THD *thd)
{
  WSREP_INFO("Stop replication by %llu", (thd) ? thd->thread_id : 0);
  if (Wsrep_server_state::instance().state() !=
      Wsrep_server_state::s_disconnected)
  {
    WSREP_DEBUG("Disconnect provider");
    Wsrep_server_state::instance().disconnect();
    Wsrep_server_state::instance().wait_until_state(Wsrep_server_state::s_disconnected);
  }

  /* my connection, should not terminate with wsrep_close_client_connection(),
     make transaction to rollback
  */
  if (thd && !thd->wsrep_applier) trans_rollback(thd);
  wsrep_close_client_connections(TRUE, thd);

  /* wait until appliers have stopped */
  wsrep_wait_appliers_close(thd);

  node_uuid= WSREP_UUID_UNDEFINED;
}

void wsrep_shutdown_replication()
{
  WSREP_INFO("Shutdown replication");
  if (Wsrep_server_state::instance().state() != wsrep::server_state::s_disconnected)
  {
    WSREP_DEBUG("Disconnect provider");
    Wsrep_server_state::instance().disconnect();
    Wsrep_server_state::instance().wait_until_state(Wsrep_server_state::s_disconnected);
  }

  wsrep_close_client_connections(TRUE);

  /* wait until appliers have stopped */
  wsrep_wait_appliers_close(NULL);
  node_uuid= WSREP_UUID_UNDEFINED;

  /* Undocking the thread specific data. */
  set_current_thd(nullptr);
}

bool wsrep_start_replication(const char *wsrep_cluster_address)
{
  int rcode;
  WSREP_DEBUG("wsrep_start_replication");

  /*
    if provider is trivial, don't even try to connect,
    but resume local node operation
  */
  if (!WSREP_PROVIDER_EXISTS)
  {
    // enable normal operation in case no provider is specified
    return true;
  }

  DBUG_ASSERT(wsrep_cluster_address[0]);

  // --wsrep-new-cluster flag is not used, checking wsrep_cluster_address
  // it should match gcomm:// only to be considered as bootstrap node.
  // This logic is used in galera.
  if (!wsrep_new_cluster && 
      (strlen(wsrep_cluster_address) == 8) &&
      !strncmp(wsrep_cluster_address, "gcomm://", 8)) 
  {
    wsrep_new_cluster= true;
  }

  bool const bootstrap(TRUE == wsrep_new_cluster);

  WSREP_INFO("Start replication");

  if ((rcode= Wsrep_server_state::instance().connect(
        wsrep_cluster_name,
        wsrep_cluster_address,
        wsrep_sst_donor,
        bootstrap)))
  {
    DBUG_PRINT("wsrep",("wsrep_ptr->connect(%s) failed: %d",
                        wsrep_cluster_address, rcode));
    WSREP_ERROR("wsrep::connect(%s) failed: %d",
                wsrep_cluster_address, rcode);
    return false;
  }
  else
  {
    try
    {
      std::string opts= Wsrep_server_state::instance().provider().options();
      wsrep_provider_options_init(opts.c_str());
    }
    catch (const wsrep::runtime_error&)
    {
      WSREP_WARN("Failed to get wsrep options");
    }
  }

  return true;
}

bool wsrep_check_mode (enum_wsrep_mode mask)
{
  return wsrep_mode & mask;
}

//seconds after which the limit warnings suppression will be activated
#define WSREP_WARNING_ACTIVATION_TIMEOUT 5*60
//number of limit warnings after which the suppression will be activated
#define WSREP_WARNING_ACTIVATION_THRESHOLD 10

enum wsrep_warning_type {
  WSREP_DISABLED = 0,
  WSREP_REQUIRE_PRIMARY_KEY= 1,
  WSREP_REQUIRE_INNODB= 2,
  WSREP_REQUIRE_MAX=3,
};

static ulonglong wsrep_warning_start_time=0;
static bool wsrep_warning_active[WSREP_REQUIRE_MAX+1];
static ulonglong wsrep_warning_count[WSREP_REQUIRE_MAX+1];
static ulonglong wsrep_total_warnings_count=0;

/**
  Auxiliary function to reset the limit of wsrep warnings.
  This is done without mutex protection, but this should be good
  enough as it doesn't matter if we loose a couple of suppressed
  messages or if this is called multiple times.
*/

static void wsrep_reset_warnings(ulonglong now)
{
  uint i;

  wsrep_warning_start_time= now;
  wsrep_total_warnings_count= 0;

  for (i= 0 ; i < WSREP_REQUIRE_MAX ; i++)
  {
    wsrep_warning_active[i]= false;
    wsrep_warning_count[i]= 0;
  }
}

static const char* wsrep_warning_name(const enum wsrep_warning_type type)
{
  switch(type)
  {
  case WSREP_REQUIRE_PRIMARY_KEY:
    return "WSREP_REQUIRE_PRIMARY_KEY"; break;
  case WSREP_REQUIRE_INNODB:
    return "WSREP_REQUIRE_INNODB"; break;
  default: assert(0); return " "; break; // for compiler
  }
}
/**
  Auxiliary function to check if the warning statements should be
  thrown or suppressed.

  Logic is:
  - If we get more than WSREP_WARNING_ACTIVATION_THRESHOLD errors
    of one type, that type of errors will be suppressed for
    WSREP_WARNING_ACTIVATION_TIMEOUT.
  - When the time limit has been reached, all suppressions are reset.

  This means that if one gets many different types of errors, some of them
  may be reset less than WSREP_WARNING_ACTIVATION_TIMEOUT. However at
  least one error is disabled for this time.

  SYNOPSIS:
  @params
   warning_type - The type of warning.

  RETURN:
    0   0k to log
    1   Message suppressed
*/

static bool wsrep_protect_against_warning_flood(
              enum wsrep_warning_type warning_type)
{
  ulonglong count;
  ulonglong now= my_interval_timer()/1000000000ULL;

  count= ++wsrep_warning_count[warning_type];
  wsrep_total_warnings_count++;

  /*
    INITIALIZING:
    If this is the first time this function is called with log warning
    enabled, the monitoring the warnings should start.
  */
  if (wsrep_warning_start_time == 0)
  {
    wsrep_reset_warnings(now);
    return false;
  }

  /*
    The following is true if we got too many errors or if the error was
    already suppressed
  */
  if (count >= WSREP_WARNING_ACTIVATION_THRESHOLD)
  {
    ulonglong diff_time= (now - wsrep_warning_start_time);

    if (!wsrep_warning_active[warning_type])
    {
      /*
        ACTIVATION:
        We got WSREP_WARNING_ACTIVATION_THRESHOLD warnings in
        less than WSREP_WARNING_ACTIVATION_TIMEOUT we activate the
        suppression.
      */
      if (diff_time <= WSREP_WARNING_ACTIVATION_TIMEOUT)
      {
        wsrep_warning_active[warning_type]= true;
        WSREP_INFO("Suppressing warnings of type '%s' for up to %d seconds because of flooding",
                   wsrep_warning_name(warning_type),
                   WSREP_WARNING_ACTIVATION_TIMEOUT);
      }
      else
      {
        /*
          There is no flooding till now, therefore we restart the monitoring
        */
        wsrep_reset_warnings(now);
      }
    }
    else
    {
      /* This type of warnings was suppressed */
      if (diff_time > WSREP_WARNING_ACTIVATION_TIMEOUT)
      {
        ulonglong save_count= wsrep_total_warnings_count;
        /* Print a suppression note and remove the suppression */
        wsrep_reset_warnings(now);
        WSREP_INFO("Suppressed %lu unsafe warnings during "
                              "the last %d seconds",
                              save_count, (int) diff_time);
      }
    }
  }

  return wsrep_warning_active[warning_type];
}

/**
  Auxiliary function to push warning to client and to the error log
*/
static void wsrep_push_warning(THD *thd,
                               enum wsrep_warning_type type,
                               const handlerton *hton,
                               const TABLE_LIST *tables)
{
  switch(type)
  {
  case WSREP_REQUIRE_PRIMARY_KEY:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_OPTION_PREVENTS_STATEMENT,
                        "WSREP: wsrep_mode = REQUIRED_PRIMARY_KEY enabled. "
                        "Table '%s'.'%s' should have PRIMARY KEY defined.",
                        tables->db.str, tables->table_name.str);
    if (global_system_variables.log_warnings > 1 &&
	!wsrep_protect_against_warning_flood(type))
      WSREP_WARN("wsrep_mode = REQUIRED_PRIMARY_KEY enabled. "
                 "Table '%s'.'%s' should have PRIMARY KEY defined",
                 tables->db.str, tables->table_name.str);
    break;
  case WSREP_REQUIRE_INNODB:
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_OPTION_PREVENTS_STATEMENT,
                        "WSREP: wsrep_mode = STRICT_REPLICATION enabled. "
                        "Storage engine %s for table '%s'.'%s' is "
                        "not supported in Galera",
                        ha_resolve_storage_engine_name(hton),
                        tables->db.str, tables->table_name.str);
    if (global_system_variables.log_warnings > 1 &&
	!wsrep_protect_against_warning_flood(type))
      WSREP_WARN("wsrep_mode = STRICT_REPLICATION enabled. "
                 "Storage engine %s for table '%s'.'%s' is "
                 "not supported in Galera",
                 ha_resolve_storage_engine_name(hton),
                 tables->db.str, tables->table_name.str);
    break;

  default: assert(0); break;
  }
}

bool wsrep_check_mode_after_open_table (THD *thd,
	const handlerton *hton,
	TABLE_LIST *tables)
{
  enum_sql_command sql_command= thd->lex->sql_command;
  bool is_dml_stmt= thd->get_command() != COM_STMT_PREPARE &&
                    (sql_command == SQLCOM_INSERT ||
                     sql_command == SQLCOM_INSERT_SELECT ||
                     sql_command == SQLCOM_REPLACE ||
                     sql_command == SQLCOM_REPLACE_SELECT ||
                     sql_command == SQLCOM_UPDATE ||
                     sql_command == SQLCOM_UPDATE_MULTI ||
                     sql_command == SQLCOM_LOAD ||
                     sql_command == SQLCOM_DELETE);

  if (!is_dml_stmt)
    return true;

  const legacy_db_type db_type= hton->db_type;
  bool replicate= ((db_type == DB_TYPE_MYISAM && wsrep_check_mode(WSREP_MODE_REPLICATE_MYISAM)) ||
                   (db_type == DB_TYPE_ARIA && wsrep_check_mode(WSREP_MODE_REPLICATE_ARIA)));
  TABLE *tbl= tables->table;

  if (replicate)
  {
    /* It is not recommended to replicate MyISAM as it lacks rollback feature
    but if user demands then actions are replicated using TOI.
    Following code will kick-start the TOI but this has to be done only once
    per statement.
    Note: kick-start will take-care of creating isolation key for all tables
    involved in the list (provided all of them are MYISAM or Aria tables). */
    if (!is_stat_table(&tables->db, &tables->alias))
    {
      if (tbl->s->primary_key == MAX_KEY &&
          wsrep_check_mode(WSREP_MODE_REQUIRED_PRIMARY_KEY))
      {
        /* Other replicated table doesn't have explicit primary-key defined. */
        wsrep_push_warning(thd, WSREP_REQUIRE_PRIMARY_KEY, hton, tables);
      }

      wsrep_before_rollback(thd, true);
      wsrep_after_rollback(thd, true);
      wsrep_after_statement(thd);
      WSREP_TO_ISOLATION_BEGIN(NULL, NULL, (tables));
    }
  } else if (db_type != DB_TYPE_UNKNOWN &&
             db_type != DB_TYPE_PERFORMANCE_SCHEMA)
  {
    bool is_system_db= (tbl &&
                       ((strcmp(tbl->s->db.str, "mysql") == 0) ||
                        (strcmp(tbl->s->db.str, "information_schema") == 0)));

    if (!is_system_db &&
	!is_temporary_table(tables))
    {

      if (db_type != DB_TYPE_INNODB &&
	  wsrep_check_mode(WSREP_MODE_STRICT_REPLICATION))
      {
        /* Table is not an InnoDB table and strict replication is requested*/
        wsrep_push_warning(thd, WSREP_REQUIRE_INNODB, hton, tables);
      }

      if (tbl->s->primary_key == MAX_KEY &&
          db_type == DB_TYPE_INNODB &&
          wsrep_check_mode(WSREP_MODE_REQUIRED_PRIMARY_KEY))
      {
        /* InnoDB table doesn't have explicit primary-key defined. */
        wsrep_push_warning(thd, WSREP_REQUIRE_PRIMARY_KEY, hton, tables);
      }

      if (db_type != DB_TYPE_INNODB &&
	  thd->variables.sql_log_bin == 1 &&
	  wsrep_check_mode(WSREP_MODE_DISALLOW_LOCAL_GTID))
      {
        /* Table is not an InnoDB table and local GTIDs are disallowed */
        my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
        push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                            ER_OPTION_PREVENTS_STATEMENT,
                            "You can't execute statements that would generate local "
                            "GTIDs when wsrep_mode = DISALLOW_LOCAL_GTID is set. "
                            "Try disabling binary logging with SET sql_log_bin=0 "
                            "to execute this statement.");
        goto wsrep_error_label;
      }
    }
  }

  return true;

wsrep_error_label:
  return false;
}

bool wsrep_check_mode_before_cmd_execute (THD *thd)
{
  bool ret= true;
  if (wsrep_check_mode(WSREP_MODE_BINLOG_ROW_FORMAT_ONLY) &&
      !thd->is_current_stmt_binlog_format_row() && is_update_query(thd->lex->sql_command))
  {
    my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_OPTION_PREVENTS_STATEMENT,
                        "WSREP: wsrep_mode = BINLOG_ROW_FORMAT_ONLY enabled. Only ROW binlog format is supported.");
    ret= false;
  }
  if (wsrep_check_mode(WSREP_MODE_REQUIRED_PRIMARY_KEY) &&
      thd->lex->sql_command == SQLCOM_CREATE_TABLE)
  {
    Key *key;
    List_iterator<Key> key_iterator(thd->lex->alter_info.key_list);
    bool primary_key_found= false;
    while ((key= key_iterator++))
    {
      if (key->type == Key::PRIMARY)
      {
        primary_key_found= true;
        break;
      }
    }
    if (!primary_key_found)
    {
      my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
      push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                          ER_OPTION_PREVENTS_STATEMENT,
                          "WSREP: wsrep_mode = REQUIRED_PRIMARY_KEY enabled. Table should have PRIMARY KEY defined.");
      ret= false;
    }
  }
  return ret;
}

bool wsrep_must_sync_wait (THD* thd, uint mask)
{
  bool ret= 0;
  if (thd->variables.wsrep_on)
  {
    mysql_mutex_lock(&thd->LOCK_thd_data);
    ret= (thd->variables.wsrep_sync_wait & mask) &&
      thd->wsrep_client_thread &&
      WSREP_ON &&
      !(thd->variables.wsrep_dirty_reads &&
        !is_update_query(thd->lex->sql_command)) &&
      !thd->in_active_multi_stmt_transaction() &&
      thd->wsrep_trx().state() !=
      wsrep::transaction::s_replaying &&
      thd->wsrep_cs().sync_wait_gtid().is_undefined();
    mysql_mutex_unlock(&thd->LOCK_thd_data);
  }
  return ret;
}

bool wsrep_sync_wait (THD* thd, uint mask)
{
  if (wsrep_must_sync_wait(thd, mask))
  {
    WSREP_DEBUG("wsrep_sync_wait: thd->variables.wsrep_sync_wait= %u, "
                "mask= %u, thd->variables.wsrep_on= %d",
                thd->variables.wsrep_sync_wait, mask,
                thd->variables.wsrep_on);
    /*
      This allows autocommit SELECTs and a first SELECT after SET AUTOCOMMIT=0
      TODO: modify to check if thd has locked any rows.
    */
    if (thd->wsrep_cs().sync_wait(-1))
    {
      const char* msg;
      int err;

      /*
        Possibly relevant error codes:
        ER_CHECKREAD, ER_ERROR_ON_READ, ER_INVALID_DEFAULT, ER_EMPTY_QUERY,
        ER_FUNCTION_NOT_DEFINED, ER_NOT_ALLOWED_COMMAND, ER_NOT_SUPPORTED_YET,
        ER_FEATURE_DISABLED, ER_QUERY_INTERRUPTED
      */

      switch (thd->wsrep_cs().current_error())
      {
      case wsrep::e_not_supported_error:
        msg= "synchronous reads by wsrep backend. "
          "Please unset wsrep_causal_reads variable.";
        err= ER_NOT_SUPPORTED_YET;
        break;
      default:
        msg= "Synchronous wait failed.";
        err= ER_LOCK_WAIT_TIMEOUT; // NOTE: the above msg won't be displayed
                                   //       with ER_LOCK_WAIT_TIMEOUT
      }

      my_error(err, MYF(0), msg);

      return true;
    }
  }

  return false;
}

enum wsrep::provider::status
wsrep_sync_wait_upto (THD*          thd,
                      wsrep_gtid_t* upto,
                      int           timeout)
{
  DBUG_ASSERT(upto);
  enum wsrep::provider::status ret;
  if (upto)
  {
    wsrep::gtid upto_gtid(wsrep::id(upto->uuid.data, sizeof(upto->uuid.data)),
                          wsrep::seqno(upto->seqno));
    ret= Wsrep_server_state::instance().wait_for_gtid(upto_gtid, timeout);
  }
  else
  {
    ret= Wsrep_server_state::instance().causal_read(timeout).second;
  }
  WSREP_DEBUG("wsrep_sync_wait_upto: %d", ret);
  return ret;
}

bool wsrep_is_show_query(enum enum_sql_command command)
{
  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
  return (sql_command_flags[command] & CF_STATUS_COMMAND) != 0;
}

static bool wsrep_is_diagnostic_query(enum enum_sql_command command)
{
  assert(command >= 0 && command <= SQLCOM_END);
  return (sql_command_flags[command] & CF_DIAGNOSTIC_STMT) != 0;
}

static enum enum_wsrep_sync_wait
wsrep_sync_wait_mask_for_command(enum enum_sql_command command)
{
  switch (command)
  {
  case SQLCOM_SELECT:
  case SQLCOM_CHECKSUM:
    return WSREP_SYNC_WAIT_BEFORE_READ;
  case SQLCOM_DELETE:
  case SQLCOM_DELETE_MULTI:
  case SQLCOM_UPDATE:
  case SQLCOM_UPDATE_MULTI:
    return WSREP_SYNC_WAIT_BEFORE_UPDATE_DELETE;
  case SQLCOM_REPLACE:
  case SQLCOM_INSERT:
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
    return WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE;
  default:
    if (wsrep_is_diagnostic_query(command))
    {
      return WSREP_SYNC_WAIT_NONE;
    }
    if (wsrep_is_show_query(command))
    {
      switch (command)
      {
      case SQLCOM_SHOW_PROFILE:
      case SQLCOM_SHOW_PROFILES:
      case SQLCOM_SHOW_SLAVE_HOSTS:
      case SQLCOM_SHOW_RELAYLOG_EVENTS:
      case SQLCOM_SHOW_SLAVE_STAT:
      case SQLCOM_SHOW_BINLOG_STAT:
      case SQLCOM_SHOW_ENGINE_STATUS:
      case SQLCOM_SHOW_ENGINE_MUTEX:
      case SQLCOM_SHOW_ENGINE_LOGS:
      case SQLCOM_SHOW_PROCESSLIST:
      case SQLCOM_SHOW_PRIVILEGES:
        return WSREP_SYNC_WAIT_NONE;
      default:
        return WSREP_SYNC_WAIT_BEFORE_SHOW;
      }
    }
  }
  return WSREP_SYNC_WAIT_NONE;
}

bool wsrep_sync_wait(THD* thd, enum enum_sql_command command)
{
  bool res = false;
  if (WSREP_CLIENT(thd) && thd->variables.wsrep_sync_wait)
    res = wsrep_sync_wait(thd, wsrep_sync_wait_mask_for_command(command));
  return res;
}

void wsrep_keys_free(wsrep_key_arr_t* key_arr)
{
    for (size_t i= 0; i < key_arr->keys_len; ++i)
    {
        my_free((void*)key_arr->keys[i].key_parts);
    }
    my_free(key_arr->keys);
    key_arr->keys= 0;
    key_arr->keys_len= 0;
}

/*!
 * @param thd    thread
 * @param tables list of tables
 * @param keys   prepared keys

 * @return true if parent table append was successfull, otherwise false.
*/
bool
wsrep_append_fk_parent_table(THD* thd, TABLE_LIST* tables, wsrep::key_array* keys)
{
    bool fail= false;
    TABLE_LIST *table;
    TABLE_LIST *table_last_in_list;

    for (table= tables; table; table= table->next_local)
    {
      if (is_temporary_table(table))
      {
        WSREP_DEBUG("Temporary table %s.%s already opened query=%s", table->db.str,
                    table->table_name.str, wsrep_thd_query(thd));
	return false;
      }
    }

    thd->release_transactional_locks();
    uint counter;
    MDL_savepoint mdl_savepoint= thd->mdl_context.mdl_savepoint();

    for (table_last_in_list= tables;;table_last_in_list= table_last_in_list->next_local)    {
      if (!table_last_in_list->next_local) {
        break;
      }
    }

    if (open_tables(thd, &tables, &counter, MYSQL_OPEN_FORCE_SHARED_HIGH_PRIO_MDL))
    {
      WSREP_DEBUG("Unable to open table for FK checks for %s", wsrep_thd_query(thd));
      fail= true;
      goto exit;
    }

    for (table= tables; table; table= table->next_local)
    {
      if (!is_temporary_table(table) && table->table)
      {
        FOREIGN_KEY_INFO *f_key_info;
        List<FOREIGN_KEY_INFO> f_key_list;

        table->table->file->get_foreign_key_list(thd, &f_key_list);
        List_iterator_fast<FOREIGN_KEY_INFO> it(f_key_list);
        while ((f_key_info=it++))
        {
          WSREP_DEBUG("appended fkey %s", f_key_info->referenced_table->str);
          keys->push_back(wsrep_prepare_key_for_toi(f_key_info->referenced_db->str,
                                                    f_key_info->referenced_table->str,
                                                    wsrep::key::shared));
        }
      }
    }

exit:
    /* close the table and release MDL locks */
    close_thread_tables(thd);
    thd->mdl_context.rollback_to_savepoint(mdl_savepoint);
    bool invalidate_next_global= false;
    for (table= tables; table; table= table->next_local)
    {
      table->table= NULL;
      table->mdl_request.ticket= NULL;
      // We should invalidate `next_global` only for entries that are added 
      // in this function
      if (table == table_last_in_list) {
        invalidate_next_global= true;
      }
      if (invalidate_next_global) {
        table->next_global= NULL;
      }
    }

    return fail;
}

bool wsrep_reload_ssl()
{
  try
  {
    std::string opts= Wsrep_server_state::instance().provider().options();
    if (opts.find("socket.ssl_reload") == std::string::npos)
    {
      WSREP_DEBUG("Option `socket.ssl_reload` not found in parameters.");
      return false;
    }
    const std::string reload_ssl_param("socket.ssl_reload=1");
    enum wsrep::provider::status ret= Wsrep_server_state::instance().provider().options(reload_ssl_param);
    if (ret)
    {
      WSREP_ERROR("Set options returned %d", ret);
      return true;
    }
    return false;
  }
  catch (...)
  {
    WSREP_ERROR("Failed to get provider options");
    return true;
  }
}

bool wsrep_split_allowlist(std::vector<std::string>& allowlist)
{
  if (!wsrep_allowlist || 0 == strlen(wsrep_allowlist))
  {
    return false;
  }
  std::istringstream ss{wsrep_allowlist};
  std::string token;
  while (std::getline(ss, token, ',')) 
  {
    if (!token.empty()) 
    {
      struct sockaddr_in sa_4;
      struct sockaddr_in6 sa_6;
      if ((inet_pton(AF_INET, token.c_str(), &(sa_4.sin_addr)) != 0) ||
          (inet_pton(AF_INET6, token.c_str(), &(sa_6.sin6_addr)) != 0))
      {
        allowlist.push_back(token);
      }
      else
      {
        WSREP_WARN("Invalid IP address %s provided in `wsrep_allowlist` variable", token.c_str());
      }
    }
  }
  return allowlist.size();
}

/*!
 * @param db      Database string
 * @param table   Table string
 * @param key     Array of wsrep_key_t
 * @param key_len In: number of elements in key array, Out: number of
 *                elements populated
 *
 * @return true if preparation was successful, otherwise false.
 */

static bool wsrep_prepare_key_for_isolation(const char* db,
                                           const char* table,
                                           wsrep_buf_t* key,
                                           size_t* key_len)
{
  if (*key_len < 2) return false;

  switch (wsrep_protocol_version)
  {
  case 0:
    *key_len= 0;
    break;
  case 1:
  case 2:
  case 3:
  case 4:
  {
    *key_len= 0;
    if (db)
    {
      key[*key_len].ptr= db;
      key[*key_len].len= strlen(db);
      ++(*key_len);
      if (table)
      {
        key[*key_len].ptr= table;
        key[*key_len].len= strlen(table);
        ++(*key_len);
      }
    }
    break;
  }
  default:
    assert(0);
    WSREP_ERROR("Unsupported protocol version: %ld", wsrep_protocol_version);
    unireg_abort(1);
    return false;
  }

    return true;
}

static bool wsrep_prepare_key_for_isolation(const char* db,
                                            const char* table,
                                            wsrep_key_arr_t* ka)
{
  wsrep_key_t* tmp;
  tmp= (wsrep_key_t*)my_realloc(PSI_INSTRUMENT_ME, ka->keys,
                                (ka->keys_len + 1) * sizeof(wsrep_key_t),
                                MYF(MY_ALLOW_ZERO_PTR));
  if (!tmp)
  {
    WSREP_ERROR("Can't allocate memory for key_array");
    return false;
  }
  ka->keys= tmp;
  if (!(ka->keys[ka->keys_len].key_parts= (wsrep_buf_t*)
        my_malloc(PSI_INSTRUMENT_ME, sizeof(wsrep_buf_t)*2, MYF(0))))
  {
    WSREP_ERROR("Can't allocate memory for key_parts");
    return false;
  }
  ka->keys[ka->keys_len].key_parts_num= 2;
  ++ka->keys_len;
  if (!wsrep_prepare_key_for_isolation(db, table,
                                       (wsrep_buf_t*)ka->keys[ka->keys_len - 1].key_parts,
                                       &ka->keys[ka->keys_len - 1].key_parts_num))
  {
    WSREP_ERROR("Preparing keys for isolation failed");
    return false;
  }

  return true;
}

static bool wsrep_prepare_keys_for_alter_add_fk(const char* child_table_db,
                                                const Alter_info* alter_info,
                                                wsrep_key_arr_t* ka)
{
  Key *key;
  List_iterator<Key> key_iterator(const_cast<Alter_info*>(alter_info)->key_list);
  while ((key= key_iterator++))
  {
    if (key->type == Key::FOREIGN_KEY)
    {
      Foreign_key *fk_key= (Foreign_key *)key;
      const char *db_name= fk_key->ref_db.str;
      const char *table_name= fk_key->ref_table.str;
      if (!db_name)
      {
        db_name= child_table_db;
      }
      if (!wsrep_prepare_key_for_isolation(db_name, table_name, ka))
      {
        return false;
      }
    }
  }
  return true;
}

static bool wsrep_prepare_keys_for_isolation(THD*              thd,
                                             const char*       db,
                                             const char*       table,
                                             const TABLE_LIST* table_list,
                                             Alter_info*       alter_info,
                                             wsrep_key_arr_t*  ka)
{
  ka->keys= 0;
  ka->keys_len= 0;

  if (db || table)
  {
    if (!wsrep_prepare_key_for_isolation(db, table, ka))
      goto err;
  }

  for (const TABLE_LIST* table= table_list; table; table= table->next_global)
  {
    if (!wsrep_prepare_key_for_isolation(table->db.str, table->table_name.str, ka))
      goto err;
  }

  if (alter_info)
  {
    if (!wsrep_prepare_keys_for_alter_add_fk(table_list->db.str, alter_info, ka))
      goto err;
  }
  return false;

err:
    wsrep_keys_free(ka);
    return true;
}

/*
 * Prepare key list from db/table and table_list
 *
 * Return zero in case of success, 1 in case of failure.
 */

bool wsrep_prepare_keys_for_isolation(THD*              thd,
                                      const char*       db,
                                      const char*       table,
                                      const TABLE_LIST* table_list,
                                      wsrep_key_arr_t*  ka)
{
  return wsrep_prepare_keys_for_isolation(thd, db, table, table_list, NULL, ka);
}

bool wsrep_prepare_key(const uchar* cache_key, size_t cache_key_len,
                       const uchar* row_id, size_t row_id_len,
                       wsrep_buf_t* key, size_t* key_len)
{
    if (*key_len < 3) return false;

    *key_len= 0;
    switch (wsrep_protocol_version)
    {
    case 0:
    {
        key[0].ptr= cache_key;
        key[0].len= cache_key_len;

        *key_len= 1;
        break;
    }
    case 1:
    case 2:
    case 3:
    case 4:
    {
        key[0].ptr= cache_key;
        key[0].len= strlen( (char*)cache_key );

        key[1].ptr= cache_key + strlen( (char*)cache_key ) + 1;
        key[1].len= strlen( (char*)(key[1].ptr) );

        *key_len= 2;
        break;
    }
    default:
        return false;
    }

    key[*key_len].ptr= row_id;
    key[*key_len].len= row_id_len;
    ++(*key_len);

    return true;
}

bool wsrep_prepare_key_for_innodb(THD* thd,
                                  const uchar* cache_key,
                                  size_t cache_key_len,
                                  const uchar* row_id,
                                  size_t row_id_len,
                                  wsrep_buf_t* key,
                                  size_t* key_len)
{

  return wsrep_prepare_key(cache_key, cache_key_len, row_id, row_id_len, key, key_len);
}

wsrep::key wsrep_prepare_key_for_toi(const char* db, const char* table,
                                     enum wsrep::key::type type)
{
  wsrep::key ret(type);
  DBUG_ASSERT(db);
  ret.append_key_part(db, strlen(db));
  if (table) ret.append_key_part(table, strlen(table));
  return ret;
}

wsrep::key_array
wsrep_prepare_keys_for_alter_add_fk(const char* child_table_db,
                                    const Alter_info* alter_info)

{
  wsrep::key_array ret;
  Key *key;
  List_iterator<Key> key_iterator(const_cast<Alter_info*>(alter_info)->key_list);
  while ((key= key_iterator++))
  {
    if (key->type == Key::FOREIGN_KEY)
    {
      Foreign_key *fk_key= (Foreign_key *)key;
      const char *db_name= fk_key->ref_db.str;
      const char *table_name= fk_key->ref_table.str;
      if (!db_name)
      {
        db_name= child_table_db;
      }
      ret.push_back(wsrep_prepare_key_for_toi(db_name, table_name,
                                              wsrep::key::exclusive));
    }
  }
  return ret;
}

wsrep::key_array wsrep_prepare_keys_for_toi(const char *db,
                                            const char *table,
                                            const TABLE_LIST *table_list,
                                            const Alter_info *alter_info,
                                            const wsrep::key_array *fk_tables)
{
  wsrep::key_array ret;
  if (db || table)
  {
    ret.push_back(wsrep_prepare_key_for_toi(db, table, wsrep::key::exclusive));
  }
  for (const TABLE_LIST* table= table_list; table; table= table->next_global)
  {
    ret.push_back(wsrep_prepare_key_for_toi(table->db.str, table->table_name.str,
                                            wsrep::key::exclusive));
  }
  if (alter_info)
  {
    wsrep::key_array fk(wsrep_prepare_keys_for_alter_add_fk(table_list->db.str, alter_info));
    if (!fk.empty())
    {
      ret.insert(ret.end(), fk.begin(), fk.end());
    }
  }
  if (fk_tables && !fk_tables->empty())
  {
    ret.insert(ret.end(), fk_tables->begin(), fk_tables->end());
  }
  return ret;
}

/*
 * Construct Query_log_Event from thd query and serialize it
 * into buffer.
 *
 * Return 0 in case of success, 1 in case of error.
 */
int wsrep_to_buf_helper(
    THD* thd, const char *query, uint query_len, uchar** buf, size_t* buf_len)
{
  IO_CACHE tmp_io_cache;
  Log_event_writer writer(&tmp_io_cache, 0);
  if (open_cached_file(&tmp_io_cache, mysql_tmpdir, TEMP_PREFIX,
                       65536, MYF(MY_WME)))
    return 1;
  int ret(0);
  enum enum_binlog_checksum_alg current_binlog_check_alg=
    (enum_binlog_checksum_alg) binlog_checksum_options;

  Format_description_log_event *tmp_fd= new Format_description_log_event(4);
  tmp_fd->checksum_alg= current_binlog_check_alg;
  writer.write(tmp_fd);
  delete tmp_fd;

#ifdef GTID_SUPPORT
  if (thd->variables.gtid_next.type == GTID_GROUP)
  {
      Gtid_log_event gtid_ev(thd, FALSE, &thd->variables.gtid_next);
      if (!gtid_ev.is_valid()) ret= 0;
      if (!ret && writer.write(&gtid_ev)) ret= 1;
  }
#endif /* GTID_SUPPORT */
  /*
   * Check if this is applier thread, slave_thread or
   * we have set manually WSREP GTID seqno. Add GTID event.
   */
  if (thd->slave_thread || wsrep_thd_is_applying(thd) || 
      thd->variables.wsrep_gtid_seq_no)
  {
    uint64 seqno= thd->variables.gtid_seq_no;
    uint32 domain_id= thd->variables.gtid_domain_id;
    uint32 server_id= thd->variables.server_id;
    if (!thd->variables.gtid_seq_no && thd->variables.wsrep_gtid_seq_no)
    {
      seqno= thd->variables.wsrep_gtid_seq_no;
      domain_id= wsrep_gtid_server.domain_id;
      server_id= wsrep_gtid_server.server_id;
    }
    Gtid_log_event gtid_event(thd, seqno, domain_id, true,
                              LOG_EVENT_SUPPRESS_USE_F, true, 0);
    gtid_event.server_id= server_id;
    if (!gtid_event.is_valid()) ret= 0;
    ret= writer.write(&gtid_event);
  }
  /*
    It's local DDL so in case of possible gtid seqno (SET gtid_seq_no=X)
    manipulation, seqno value will be ignored.
   */
  else
  {
    thd->variables.gtid_seq_no= 0;
  }

  /* if there is prepare query, add event for it */
  if (!ret && thd->wsrep_TOI_pre_query)
  {
    Query_log_event ev(thd, thd->wsrep_TOI_pre_query,
		       thd->wsrep_TOI_pre_query_len,
		       FALSE, FALSE, FALSE, 0);
    ev.checksum_alg= current_binlog_check_alg;
    if (writer.write(&ev)) ret= 1;
  }

  /* continue to append the actual query */
  Query_log_event ev(thd, query, query_len, FALSE, FALSE, FALSE, 0);
  /* WSREP GTID mode, we need to change server_id */
  if (wsrep_gtid_mode && !thd->variables.gtid_seq_no)
    ev.server_id= wsrep_gtid_server.server_id;
  ev.checksum_alg= current_binlog_check_alg;
  if (!ret && writer.write(&ev)) ret= 1;
  if (!ret && wsrep_write_cache_buf(&tmp_io_cache, buf, buf_len)) ret= 1;
  close_cached_file(&tmp_io_cache);
  return ret;
}

static int
wsrep_alter_query_string(THD *thd, String *buf)
{
  /* Append the "ALTER" part of the query */
  if (buf->append(STRING_WITH_LEN("ALTER ")))
    return 1;
  /* Append definer */
  append_definer(thd, buf, &(thd->lex->definer->user), &(thd->lex->definer->host));
  /* Append the left part of thd->query after event name part */
  if (buf->append(thd->lex->stmt_definition_begin,
                  thd->lex->stmt_definition_end -
                  thd->lex->stmt_definition_begin))
    return 1;

  return 0;
}

static int wsrep_alter_event_query(THD *thd, uchar** buf, size_t* buf_len)
{
  String log_query;

  if (wsrep_alter_query_string(thd, &log_query))
  {
    WSREP_WARN("events alter string failed: schema: %s, query: %s",
               thd->get_db(), thd->query());
    return 1;
  }
  return wsrep_to_buf_helper(thd, log_query.ptr(), log_query.length(), buf, buf_len);
}

#include "sql_show.h"
static int
create_view_query(THD *thd, uchar** buf, size_t* buf_len)
{
    LEX *lex= thd->lex;
    SELECT_LEX *select_lex= lex->first_select_lex();
    TABLE_LIST *first_table= select_lex->table_list.first;
    TABLE_LIST *views= first_table;
    LEX_USER *definer;
    String buff;
    const LEX_CSTRING command[3]=
      {{ STRING_WITH_LEN("CREATE ") },
       { STRING_WITH_LEN("ALTER ") },
       { STRING_WITH_LEN("CREATE OR REPLACE ") }};

    buff.append(&command[thd->lex->create_view->mode]);

    if (lex->definer)
      definer= get_current_user(thd, lex->definer);
    else
    {
      /*
        DEFINER-clause is missing; we have to create default definer in
        persistent arena to be PS/SP friendly.
        If this is an ALTER VIEW then the current user should be set as
        the definer.
      */
      definer= create_default_definer(thd, false);
    }

    if (definer)
    {
      views->definer.user= definer->user;
      views->definer.host= definer->host;
    } else {
      WSREP_ERROR("Failed to get DEFINER for VIEW.");
      return 1;
    }

    views->algorithm   = lex->create_view->algorithm;
    views->view_suid   = lex->create_view->suid;
    views->with_check  = lex->create_view->check;

    view_store_options(thd, views, &buff);
    buff.append(STRING_WITH_LEN("VIEW "));
    /* Test if user supplied a db (ie: we did not use thd->db) */
    if (views->db.str && views->db.str[0] &&
        (thd->db.str == NULL || cmp(&views->db, &thd->db)))
    {
      append_identifier(thd, &buff, &views->db);
      buff.append('.');
    }
    append_identifier(thd, &buff, &views->table_name);
    if (lex->view_list.elements)
    {
      List_iterator_fast<LEX_CSTRING> names(lex->view_list);
      LEX_CSTRING *name;
      int i;

      buff.append('(');
      for (i= 0; (name= names++); i++)
      {
        append_identifier(thd, &buff, name);
        buff.append(", ", 2);
      }
      if (i)
        buff.length(buff.length()-2);
      buff.append(')');
    }
    buff.append(STRING_WITH_LEN(" AS "));
    buff.append(thd->lex->create_view->select.str,
                thd->lex->create_view->select.length);
    return wsrep_to_buf_helper(thd, buff.ptr(), buff.length(), buf, buf_len);
}

/*
  Rewrite DROP TABLE for TOI. Temporary tables are eliminated from
  the query as they are visible only to client connection.

  TODO: See comments for sql_base.cc:drop_temporary_table() and refine
  the function to deal with transactional locked tables.
 */
static int wsrep_drop_table_query(THD* thd, uchar** buf, size_t* buf_len)
{

  LEX* lex= thd->lex;
  SELECT_LEX* select_lex= lex->first_select_lex();
  TABLE_LIST* first_table= select_lex->table_list.first;
  String buff;

  DBUG_ASSERT(!lex->create_info.tmp_table());

  bool found_temp_table= false;
  for (TABLE_LIST* table= first_table; table; table= table->next_global)
  {
    if (thd->find_temporary_table(table->db.str, table->table_name.str))
    {
      found_temp_table= true;
      break;
    }
  }

  if (found_temp_table)
  {
    buff.append(STRING_WITH_LEN("DROP TABLE "));
    if (lex->check_exists)
      buff.append(STRING_WITH_LEN("IF EXISTS "));

    for (TABLE_LIST* table= first_table; table; table= table->next_global)
    {
      if (!thd->find_temporary_table(table->db.str, table->table_name.str))
      {
        append_identifier(thd, &buff, table->db.str, table->db.length);
        buff.append('.');
        append_identifier(thd, &buff,
                          table->table_name.str, table->table_name.length);
        buff.append(',');
      }
    }

    /* Chop the last comma */
    buff.chop();
    buff.append(STRING_WITH_LEN(" /* generated by wsrep */"));

    WSREP_DEBUG("Rewrote '%s' as '%s'", thd->query(), buff.ptr());

    return wsrep_to_buf_helper(thd, buff.ptr(), buff.length(), buf, buf_len);
  }
  else
  {
    return wsrep_to_buf_helper(thd, thd->query(), thd->query_length(),
                               buf, buf_len);
  }
}


/* Forward declarations. */
int wsrep_create_trigger_query(THD *thd, uchar** buf, size_t* buf_len);

bool wsrep_should_replicate_ddl_iterate(THD* thd, const TABLE_LIST* table_list)
{
  if (WSREP(thd))
  {
    for (const TABLE_LIST* it= table_list; it; it= it->next_global)
    {
      if (it->table &&
          !wsrep_should_replicate_ddl(thd, it->table->s->db_type()))
        return false;
    }
  }
  return true;
}

bool wsrep_should_replicate_ddl(THD* thd, const handlerton *hton)
{
  if (!wsrep_check_mode(WSREP_MODE_STRICT_REPLICATION))
    return true;

  if (!hton)
    return true;

  switch (hton->db_type)
  {
    case DB_TYPE_INNODB:
      return true;
      break;
    case DB_TYPE_MYISAM:
      if (wsrep_check_mode(WSREP_MODE_REPLICATE_MYISAM))
        return true;
      else
        WSREP_DEBUG("wsrep OSU failed for %s", wsrep_thd_query(thd));
      break;
    case DB_TYPE_ARIA:
      if (wsrep_check_mode(WSREP_MODE_REPLICATE_ARIA))
	return true;
      else
        WSREP_DEBUG("wsrep OSU failed for %s", wsrep_thd_query(thd));
      break;
    default:
      WSREP_DEBUG("wsrep OSU failed for %s", wsrep_thd_query(thd));
      break;
  }

  /* wsrep_mode = STRICT_REPLICATION, treat as error */
  my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
  push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                      ER_ILLEGAL_HA,
                      "WSREP: wsrep_mode = STRICT_REPLICATION enabled. "
                      "Storage engine %s not supported.",
                      ha_resolve_storage_engine_name(hton));
  return false;
}
/*
  Decide if statement should run in TOI.

  Look if table or table_list contain temporary tables. If the
  statement affects only temporary tables,   statement should not run
  in TOI. If the table list contains mix of regular and temporary tables
  (DROP TABLE, OPTIMIZE, ANALYZE), statement should be run in TOI but
  should be rewritten at later time for replication to contain only
  non-temporary tables.
 */
bool wsrep_can_run_in_toi(THD *thd, const char *db, const char *table,
                                 const TABLE_LIST *table_list,
                                 const HA_CREATE_INFO* create_info)
{
  DBUG_ASSERT(!table || db);
  DBUG_ASSERT(table_list || db);

  LEX* lex= thd->lex;
  SELECT_LEX* select_lex= lex->first_select_lex();
  const TABLE_LIST* first_table= select_lex->table_list.first;

  switch (lex->sql_command)
  {
  case SQLCOM_CREATE_TABLE:
    if (thd->lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
    {
      return false;
    }
    if (!wsrep_should_replicate_ddl(thd, create_info->db_type))
    {
      return false;
    }
    /*
      If mariadb master has replicated a CTAS, we should not replicate the create table
      part separately as TOI, but to replicate both create table and following inserts
      as one write set.
      Howver, if CTAS creates empty table, we should replicate the create table alone
      as TOI. We have to do relay log event lookup to see if row events follow the
      create table event.
    */
    if (thd->slave_thread &&
	!(thd->rgi_slave->gtid_ev_flags2 & Gtid_log_event::FL_STANDALONE))
    {
      /* this is CTAS, either empty or populated table */
      ulonglong event_size = 0;
      enum Log_event_type ev_type= wsrep_peak_event(thd->rgi_slave, &event_size);
      switch (ev_type)
      {
      case QUERY_EVENT:
        /* CTAS with empty table, we replicate create table as TOI */
        break;

      case TABLE_MAP_EVENT:
        WSREP_DEBUG("replicating CTAS of empty table as TOI");
        // fall through
      case WRITE_ROWS_EVENT:
        /* CTAS with populated table, we replicate later at commit time */
        WSREP_DEBUG("skipping create table of CTAS replication");
        return false;

      default:
        WSREP_WARN("unexpected async replication event: %d", ev_type);
      }
      return true;
    }
    /* no next async replication event */
    return true;
    break;
  case SQLCOM_CREATE_VIEW:

    DBUG_ASSERT(!table_list);
    DBUG_ASSERT(first_table); /* First table is view name */
    /*
      If any of the remaining tables refer to temporary table error
      is returned to client, so TOI can be skipped
    */
    for (const TABLE_LIST* it= first_table->next_global; it; it= it->next_global)
    {
      if (thd->find_temporary_table(it))
      {
        return false;
      }
    }
    return true;
    break;
  case SQLCOM_CREATE_TRIGGER:

    DBUG_ASSERT(first_table);

    if (thd->find_temporary_table(first_table))
    {
      return false;
    }
    return true;
    break;
  case SQLCOM_DROP_TRIGGER:
    DBUG_ASSERT(table_list);
    if (thd->find_temporary_table(table_list))
    {
      return false;
    }
    return true;
    break;
  case SQLCOM_ALTER_TABLE:
    if (create_info)
    {
      const handlerton *hton= create_info->db_type;

      if (!hton)
	hton= ha_default_handlerton(thd);
      if (!wsrep_should_replicate_ddl(thd, hton))
        return false;
    }
    /* fallthrough */
  default:
    if (table && !thd->find_temporary_table(db, table))
    {
      return true;
    }

    if (table_list)
    {
      for (const TABLE_LIST* table= first_table; table; table= table->next_global)
      {
        if (!thd->find_temporary_table(table->db.str, table->table_name.str))
        {
          return true;
        }
      }
    }

    return !(table || table_list);
    break;
  }
}

static int wsrep_create_sp(THD *thd, uchar** buf, size_t* buf_len)
{
  String log_query;
  sp_head *sp= thd->lex->sphead;
  sql_mode_t saved_mode= thd->variables.sql_mode;
  String retstr(64);
  LEX_CSTRING returns= empty_clex_str;
  retstr.set_charset(system_charset_info);

  log_query.set_charset(system_charset_info);

  if (sp->m_handler->type() == SP_TYPE_FUNCTION)
  {
    sp_returns_type(thd, retstr, sp);
    retstr.get_value(&returns);
  }
  if (sp->m_handler->
      show_create_sp(thd, &log_query,
                     sp->m_explicit_name ? sp->m_db : null_clex_str,
                     sp->m_name, sp->m_params, returns,
                     sp->m_body, sp->chistics(),
                     thd->lex->definer[0],
                     thd->lex->create_info,
                     saved_mode))
  {
    WSREP_WARN("SP create string failed: schema: %s, query: %s",
               thd->get_db(), thd->query());
    return 1;
  }

  return wsrep_to_buf_helper(thd, log_query.ptr(), log_query.length(), buf, buf_len);
}

static int wsrep_TOI_event_buf(THD* thd, uchar** buf, size_t* buf_len)
{
  int err;
  switch (thd->lex->sql_command)
  {
  case SQLCOM_CREATE_VIEW:
    err= create_view_query(thd, buf, buf_len);
    break;
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
    err= wsrep_create_sp(thd, buf, buf_len);
    break;
  case SQLCOM_CREATE_TRIGGER:
    err= wsrep_create_trigger_query(thd, buf, buf_len);
    break;
  case SQLCOM_CREATE_EVENT:
    err= wsrep_create_event_query(thd, buf, buf_len);
    break;
  case SQLCOM_ALTER_EVENT:
    err= wsrep_alter_event_query(thd, buf, buf_len);
    break;
  case SQLCOM_DROP_TABLE:
    err= wsrep_drop_table_query(thd, buf, buf_len);
    break;
  case SQLCOM_CREATE_ROLE:
    if (sp_process_definer(thd))
    {
      WSREP_WARN("Failed to set CREATE ROLE definer for TOI.");
    }
    /* fallthrough */
  default:
    err= wsrep_to_buf_helper(thd, thd->query(), thd->query_length(), buf,
                             buf_len);
    break;
  }

  return err;
}

static void wsrep_TOI_begin_failed(THD* thd, const wsrep_buf_t* /* const err */)
{
  if (wsrep_thd_trx_seqno(thd) > 0)
  {
    /* GTID was granted and TO acquired - need to log event and release TO */
    if (wsrep_emulate_bin_log) wsrep_thd_binlog_trx_reset(thd);
    if (wsrep_write_dummy_event(thd, "TOI begin failed")) { goto fail; }
    wsrep::client_state& cs(thd->wsrep_cs());
    std::string const err(wsrep::to_c_string(cs.current_error()));
    wsrep::mutable_buffer err_buf;
    err_buf.push_back(err);
    int const ret= cs.leave_toi_local(err_buf);
    if (ret)
    {
      WSREP_ERROR("Leaving critical section for failed TOI failed: thd: %lld, "
                  "schema: %s, SQL: %s, rcode: %d wsrep_error: %s",
                  (long long)thd->real_id, thd->db.str,
                  thd->query(), ret, err.c_str());
      goto fail;
    }
  }
  return;
fail:
  WSREP_ERROR("Failed to release TOI resources. Need to abort.");
  unireg_abort(1);
}


/*
  returns:
   0: statement was replicated as TOI
   1: TOI replication was skipped
  -1: TOI replication failed
 */
static int wsrep_TOI_begin(THD *thd, const char *db, const char *table,
                           const TABLE_LIST *table_list,
                           const Alter_info *alter_info,
                           const wsrep::key_array *fk_tables,
                           const HA_CREATE_INFO *create_info)
{
  DBUG_ASSERT(wsrep_OSU_method_get(thd) == WSREP_OSU_TOI);

  WSREP_DEBUG("TOI Begin: %s", wsrep_thd_query(thd));

  if (wsrep_can_run_in_toi(thd, db, table, table_list, create_info) == false)
  {
    WSREP_DEBUG("No TOI for %s", wsrep_thd_query(thd));
    return 1;
  }

  uchar* buf= 0;
  size_t buf_len(0);
  int buf_err;
  int rc;

  buf_err= wsrep_TOI_event_buf(thd, &buf, &buf_len);

  if (buf_err) {
    WSREP_ERROR("Failed to create TOI event buf: %d", buf_err);
    my_message(ER_UNKNOWN_ERROR,
               "WSREP replication failed to prepare TOI event buffer. "
               "Check your query.",
               MYF(0));
    return -1;
  }

  struct wsrep_buf buff= { buf, buf_len };

  wsrep::key_array key_array=
    wsrep_prepare_keys_for_toi(db, table, table_list, alter_info, fk_tables);

  if (thd->has_read_only_protection())
  {
    /* non replicated DDL, affecting temporary tables only */
    WSREP_DEBUG("TO isolation skipped, sql: %s."
                "Only temporary tables affected.",
                wsrep_thd_query(thd));
    if (buf) my_free(buf);
    return -1;
  }

  thd_proc_info(thd, "acquiring total order isolation");
  WSREP_DEBUG("wsrep_TOI_begin for %s", wsrep_thd_query(thd));
  THD_STAGE_INFO(thd, stage_waiting_isolation);

  wsrep::client_state& cs(thd->wsrep_cs());

  int ret= cs.enter_toi_local(key_array,
                              wsrep::const_buffer(buff.ptr, buff.len));

  if (ret)
  {
    DBUG_ASSERT(cs.current_error());
    WSREP_DEBUG("to_execute_start() failed for %llu: %s, seqno: %lld",
                thd->thread_id, wsrep_thd_query(thd),
                (long long)wsrep_thd_trx_seqno(thd));

    /* jump to error handler in mysql_execute_command() */
    switch (cs.current_error())
    {
    case wsrep::e_size_exceeded_error:
      WSREP_WARN("TO isolation failed for: %d, schema: %s, sql: %s. "
                 "Maximum size exceeded.",
                 ret,
                 (thd->db.str ? thd->db.str : "(null)"),
                 wsrep_thd_query(thd));
      my_error(ER_UNKNOWN_ERROR, MYF(0), "Maximum writeset size exceeded");
      break;
    case wsrep::e_deadlock_error:
      WSREP_WARN("TO isolation failed for: %d, schema: %s, sql: %s. "
                 "Deadlock error.",
                 ret,
                 (thd->db.str ? thd->db.str : "(null)"),
                 wsrep_thd_query(thd));
      my_error(ER_LOCK_DEADLOCK, MYF(0));
      break;
    case wsrep::e_timeout_error:
      WSREP_WARN("TO isolation failed for: %d, schema: %s, sql: %s. "
                 "Operation timed out.",
                 ret,
                 (thd->db.str ? thd->db.str : "(null)"),
                 wsrep_thd_query(thd));
      my_error(ER_LOCK_WAIT_TIMEOUT, MYF(0));
      break;
    default:
      WSREP_WARN("TO isolation failed for: %d, schema: %s, sql: %s. "
                 "Check your wsrep connection state and retry the query.",
                 ret,
                 (thd->db.str ? thd->db.str : "(null)"),
                 wsrep_thd_query(thd));

      if (!thd->is_error())
      {
        my_error(ER_LOCK_DEADLOCK, MYF(0), "WSREP replication failed. Check "
                 "your wsrep connection state and retry the query.");
      }
    }
    rc= -1;
  }
  else {
    if (!thd->variables.gtid_seq_no)
    {
    uint64 seqno= 0;
      if (thd->variables.wsrep_gtid_seq_no &&
          thd->variables.wsrep_gtid_seq_no > wsrep_gtid_server.seqno())
      {
        seqno= thd->variables.wsrep_gtid_seq_no;
        wsrep_gtid_server.seqno(thd->variables.wsrep_gtid_seq_no);
      }
      else
      {
        seqno= wsrep_gtid_server.seqno_inc();
      }
      thd->variables.wsrep_gtid_seq_no= 0;
      thd->wsrep_current_gtid_seqno= seqno;
      if (mysql_bin_log.is_open() && wsrep_gtid_mode)
      {
        thd->variables.gtid_seq_no= seqno;
        thd->variables.gtid_domain_id= wsrep_gtid_server.domain_id;
        thd->variables.server_id= wsrep_gtid_server.server_id;
      }
    }
    ++wsrep_to_isolation;
    rc= 0;
  }

  if (buf) my_free(buf);

  if (rc) wsrep_TOI_begin_failed(thd, NULL);

  return rc;
}

static void wsrep_TOI_end(THD *thd) {
  wsrep_to_isolation--;
  wsrep::client_state& client_state(thd->wsrep_cs());
  DBUG_ASSERT(wsrep_thd_is_local_toi(thd));
  WSREP_DEBUG("TO END: %lld: %s", client_state.toi_meta().seqno().get(),
              wsrep_thd_query(thd));

  wsrep_gtid_server.signal_waiters(thd->wsrep_current_gtid_seqno, false);

  if (wsrep_thd_is_local_toi(thd))
  {
    wsrep::mutable_buffer err;

    thd->wsrep_last_written_gtid_seqno= thd->wsrep_current_gtid_seqno;
    wsrep_set_SE_checkpoint(client_state.toi_meta().gtid(), wsrep_gtid_server.gtid());

    if (thd->is_error() && !wsrep_must_ignore_error(thd))
    {
      wsrep_store_error(thd, err);
    }

    int const ret= client_state.leave_toi_local(err);

    if (!ret)
    {
      WSREP_DEBUG("TO END: %lld", client_state.toi_meta().seqno().get());
    }
    else
    {
      WSREP_WARN("TO isolation end failed for: %d, schema: %s, sql: %s",
                 ret, (thd->db.str ? thd->db.str : "(null)"), wsrep_thd_query(thd));
    }
  }
}

static int wsrep_RSU_begin(THD *thd, const char *db_, const char *table_)
{
  WSREP_DEBUG("RSU BEGIN: %lld, : %s", wsrep_thd_trx_seqno(thd),
              wsrep_thd_query(thd));

  if (thd->variables.wsrep_OSU_method == WSREP_OSU_RSU &&
      thd->variables.sql_log_bin == 1 &&
      wsrep_check_mode(WSREP_MODE_DISALLOW_LOCAL_GTID))
  {
    /* wsrep_mode = WSREP_MODE_DISALLOW_LOCAL_GTID, treat as error */
    my_error(ER_GALERA_REPLICATION_NOT_SUPPORTED, MYF(0));
    push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
                        ER_OPTION_PREVENTS_STATEMENT,
                        "You can't execute statements that would generate local "
                        "GTIDs when wsrep_mode = DISALLOW_LOCAL_GTID is set. "
                        "Try disabling binary logging with SET sql_log_bin=0 "
                        "to execute this statement.");

    return -1;
  }

  if (thd->wsrep_cs().begin_rsu(5000))
  {
    WSREP_WARN("RSU begin failed");
  }
  else
  {
    thd->variables.wsrep_on= 0;
  }
  return 0;
}

static void wsrep_RSU_end(THD *thd)
{
  WSREP_DEBUG("RSU END: %lld : %s", wsrep_thd_trx_seqno(thd),
              wsrep_thd_query(thd));
  if (thd->wsrep_cs().end_rsu())
  {
    WSREP_WARN("Failed to end RSU, server may need to be restarted");
  }
  thd->variables.wsrep_on= 1;
}

static inline bool is_replaying_connection(THD *thd)
{
  bool ret;

  mysql_mutex_lock(&thd->LOCK_thd_data);
  ret=  (thd->wsrep_trx().state() == wsrep::transaction::s_replaying) ? true : false;
  mysql_mutex_unlock(&thd->LOCK_thd_data);

  return ret;
}

int wsrep_to_isolation_begin(THD *thd, const char *db_, const char *table_,
                             const TABLE_LIST* table_list,
                             const Alter_info *alter_info,
                             const wsrep::key_array *fk_tables,
                             const HA_CREATE_INFO *create_info)
{
  /*
    No isolation for applier or replaying threads.
   */
  if (!wsrep_thd_is_local(thd))
  {
    if (wsrep_OSU_method_get(thd) == WSREP_OSU_TOI)
      WSREP_DEBUG("%s TOI Begin: %s",
                  is_replaying_connection(thd) ? "Replay" : "Apply",
                  wsrep_thd_query(thd));

    return 0;
  }

  if (thd->wsrep_parallel_slave_wait_for_prior_commit())
  {
    WSREP_WARN("TOI: wait_for_prior_commit() returned error.");
    return -1;
  }

  int ret= 0;

  mysql_mutex_lock(&thd->LOCK_thd_data);

  if (thd->wsrep_trx().state() == wsrep::transaction::s_must_abort)
  {
    WSREP_INFO("thread: %lld  schema: %s  query: %s has been aborted due to multi-master conflict",
               (longlong) thd->thread_id, thd->get_db(), thd->query());
    mysql_mutex_unlock(&thd->LOCK_thd_data);
    return WSREP_TRX_FAIL;
  }
  mysql_mutex_unlock(&thd->LOCK_thd_data);

  DBUG_ASSERT(wsrep_thd_is_local(thd));
  DBUG_ASSERT(thd->wsrep_trx().ws_meta().seqno().is_undefined());

  if (Wsrep_server_state::instance().desynced_on_pause())
  {
    my_message(ER_UNKNOWN_COM_ERROR,
               "Aborting TOI: Replication paused on node for FTWRL/BACKUP STAGE.", MYF(0));
    WSREP_DEBUG("Aborting TOI: Replication paused on node for FTWRL/BACKUP STAGE.: %s %llu",
                wsrep_thd_query(thd), thd->thread_id);
    return -1;
  }

  if (wsrep_debug && thd->mdl_context.has_locks())
  {
    WSREP_DEBUG("thread holds MDL locks at TI begin: %s %llu",
                wsrep_thd_query(thd), thd->thread_id);
  }

  /*
    It makes sense to set auto_increment_* to defaults in TOI operations.
    Must be done before wsrep_TOI_begin() since Query_log_event encapsulating
    TOI statement and auto inc variables for wsrep replication is constructed
    there. Variables are reset back in THD::reset_for_next_command() before
    processing of next command.
   */
  if (wsrep_auto_increment_control)
  {
    thd->variables.auto_increment_offset= 1;
    thd->variables.auto_increment_increment= 1;
  }

  if (thd->variables.wsrep_on && wsrep_thd_is_local(thd))
  {
    switch (wsrep_OSU_method_get(thd)) {
    case WSREP_OSU_TOI:
      ret= wsrep_TOI_begin(thd, db_, table_, table_list, alter_info, fk_tables,
                           create_info);
      break;
    case WSREP_OSU_RSU:
      ret= wsrep_RSU_begin(thd, db_, table_);
      break;
    default:
      WSREP_ERROR("Unsupported OSU method: %lu",
                  wsrep_OSU_method_get(thd));
      ret= -1;
      break;
    }

    switch (ret) {
    case 0: /* wsrep_TOI_begin should set toi mode */
      if (thd->variables.wsrep_OSU_method == WSREP_OSU_TOI)
      {
        /*
          TOI operations ignore the provided lock_wait_timeout once replicated,
          and restore it after operation is done.
         */
        thd->variables.saved_lock_wait_timeout= thd->variables.lock_wait_timeout;
        thd->variables.lock_wait_timeout= LONG_TIMEOUT;
      }
      break;
    case 1:
        /* TOI replication skipped, treat as success */
        ret= 0;
      break;
    case -1:
      /* TOI replication failed, treat as error */
      break;
    }
  }

  return ret;
}

void wsrep_to_isolation_end(THD *thd)
{
  if (wsrep_thd_is_local_toi(thd))
  {
    thd->variables.lock_wait_timeout= thd->variables.saved_lock_wait_timeout;
    DBUG_ASSERT(wsrep_OSU_method_get(thd) == WSREP_OSU_TOI);
    wsrep_TOI_end(thd);
  }
  else if (wsrep_thd_is_in_rsu(thd))
  {
    thd->variables.lock_wait_timeout= thd->variables.saved_lock_wait_timeout;
    DBUG_ASSERT(wsrep_OSU_method_get(thd) == WSREP_OSU_RSU);
    wsrep_RSU_end(thd);
  }
  else
  {
   /* Applier or replaying threads just output TO END */
   if (wsrep_debug)
   {
     wsrep::client_state& client_state(thd->wsrep_cs());
     WSREP_DEBUG("%s TO END: %lld: %s",
                 is_replaying_connection(thd) ? "Replay" : "Apply",
                 client_state.toi_meta().seqno().get(),
                 wsrep_thd_query(thd));
   }
   return;
  }

  if (wsrep_emulate_bin_log) wsrep_thd_binlog_trx_reset(thd);
}

#define WSREP_MDL_LOG(severity, msg, schema, schema_len, req, gra)             \
    WSREP_##severity(                                                          \
      "%s\n"                                                                   \
      "schema:  %.*s\n"                                                        \
      "request: (%llu \tseqno %lld \twsrep (%s, %s, %s) cmd %d %d \t%s)\n"     \
      "granted: (%llu \tseqno %lld \twsrep (%s, %s, %s) cmd %d %d \t%s)",      \
      msg, schema_len, schema,                                                 \
      req->thread_id, (long long)wsrep_thd_trx_seqno(req),                     \
      wsrep_thd_client_mode_str(req), wsrep_thd_client_state_str(req), wsrep_thd_transaction_state_str(req), \
      req->get_command(), req->lex->sql_command, req->query(),                 \
      gra->thread_id, (long long)wsrep_thd_trx_seqno(gra),                     \
      wsrep_thd_client_mode_str(gra), wsrep_thd_client_state_str(gra), wsrep_thd_transaction_state_str(gra), \
      gra->get_command(), gra->lex->sql_command, gra->query());

/**
  Check if request for the metadata lock should be granted to the requester.

  @param  requestor_ctx        The MDL context of the requestor
  @param  ticket               MDL ticket for the requested lock

  @retval TRUE   Lock request can be granted
  @retval FALSE  Lock request cannot be granted
*/

void wsrep_handle_mdl_conflict(MDL_context *requestor_ctx,
                               const MDL_ticket *ticket,
                               const MDL_key *key)
{
  THD *request_thd= requestor_ctx->get_thd();
  THD *granted_thd= ticket->get_ctx()->get_thd();

  /* Fallback to the non-wsrep behaviour */
  if (!WSREP(request_thd)) return;

  const char* schema= key->db_name();
  int schema_len= key->db_name_length();

  mysql_mutex_lock(&request_thd->LOCK_thd_data);

  if (wsrep_thd_is_toi(request_thd) ||
      wsrep_thd_is_applying(request_thd))
  {
    WSREP_DEBUG("wsrep_handle_mdl_conflict request TOI/APPLY for %s",
                wsrep_thd_query(request_thd));
    THD_STAGE_INFO(request_thd, stage_waiting_isolation);
    mysql_mutex_unlock(&request_thd->LOCK_thd_data);
    WSREP_MDL_LOG(DEBUG, "MDL conflict ", schema, schema_len,
                  request_thd, granted_thd);
    ticket->wsrep_report(wsrep_debug);

    mysql_mutex_lock(&granted_thd->LOCK_thd_data);

    if (wsrep_thd_is_toi(granted_thd) ||
        wsrep_thd_is_applying(granted_thd))
    {
      if (wsrep_thd_is_aborting(granted_thd))
      {
        WSREP_DEBUG("BF thread waiting for SR in aborting state for %s",
                    wsrep_thd_query(request_thd));
        THD_STAGE_INFO(request_thd, stage_waiting_isolation);
        ticket->wsrep_report(wsrep_debug);
        mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
      }
      else if (wsrep_thd_is_SR(granted_thd) && !wsrep_thd_is_SR(request_thd))
      {
        WSREP_MDL_LOG(INFO, "MDL conflict, DDL vs SR",
                      schema, schema_len, request_thd, granted_thd);
        mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
        WSREP_DEBUG("wsrep_handle_mdl_conflict DDL vs SR for %s",
                    wsrep_thd_query(request_thd));
        THD_STAGE_INFO(request_thd, stage_waiting_isolation);
        wsrep_abort_thd(request_thd, granted_thd, 1);
      }
      else
      {
        WSREP_MDL_LOG(INFO, "MDL BF-BF conflict", schema, schema_len,
                      request_thd, granted_thd);
        ticket->wsrep_report(true);
        mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
        unireg_abort(1);
      }
    }
    else if (granted_thd->lex->sql_command == SQLCOM_FLUSH ||
             granted_thd->mdl_context.has_explicit_locks())
    {
      WSREP_DEBUG("BF thread waiting for FLUSH for %s",
                  wsrep_thd_query(request_thd));
      THD_STAGE_INFO(request_thd, stage_waiting_ddl);
      ticket->wsrep_report(wsrep_debug);
      mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
    }
    else if (request_thd->lex->sql_command == SQLCOM_DROP_TABLE)
    {
      WSREP_DEBUG("DROP caused BF abort, conf %s for %s",
                  wsrep_thd_transaction_state_str(granted_thd),
                  wsrep_thd_query(request_thd));
      THD_STAGE_INFO(request_thd, stage_waiting_isolation);
      ticket->wsrep_report(wsrep_debug);
      mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
      wsrep_abort_thd(request_thd, granted_thd, 1);
    }
    else
    {
      WSREP_MDL_LOG(DEBUG, "MDL conflict-> BF abort", schema, schema_len,
                    request_thd, granted_thd);
      WSREP_DEBUG("wsrep_handle_mdl_conflict -> BF abort for %s",
                  wsrep_thd_query(request_thd));
      THD_STAGE_INFO(request_thd, stage_waiting_isolation);
      ticket->wsrep_report(wsrep_debug);

      if (granted_thd->wsrep_trx().active())
      {
        mysql_mutex_unlock(&granted_thd->LOCK_thd_data);
        wsrep_abort_thd(request_thd, granted_thd, 1);
      }
      else
      {
        /*
          Granted_thd is likely executing with wsrep_on=0. If the requesting
          thd is BF, BF abort and wait.
        */
        mysql_mutex_unlock(&granted_thd->LOCK_thd_data);

        if (wsrep_thd_is_BF(request_thd, FALSE))
        {
          ha_abort_transaction(request_thd, granted_thd, TRUE);
        }
        else
        {
	  WSREP_MDL_LOG(INFO, "MDL unknown BF-BF conflict",
                        schema, schema_len,
                        request_thd, granted_thd);
	  ticket->wsrep_report(true);
	  unireg_abort(1);
        }
      }
    }
  }
  else
  {
    mysql_mutex_unlock(&request_thd->LOCK_thd_data);
  }
}

/**/
static bool abort_replicated(THD *thd)
{
  bool ret_code= false;
  if (thd->wsrep_trx().state() == wsrep::transaction::s_committing)
  {
    WSREP_DEBUG("aborting replicated trx: %llu", (ulonglong)(thd->real_id));

    (void)wsrep_abort_thd(thd, thd, TRUE);
    ret_code= true;
  }
  return ret_code;
}

/**/
static inline bool is_client_connection(THD *thd)
{
  return (thd->wsrep_client_thread && thd->variables.wsrep_on);
}

static inline bool is_committing_connection(THD *thd)
{
  bool ret;

  mysql_mutex_lock(&thd->LOCK_thd_data);
  ret=  (thd->wsrep_trx().state() == wsrep::transaction::s_committing) ? true : false;
  mysql_mutex_unlock(&thd->LOCK_thd_data);

  return ret;
}

static my_bool have_client_connections(THD *thd, void*)
{
  DBUG_PRINT("quit",("Informing thread %lld that it's time to die",
                     (longlong) thd->thread_id));
  if (is_client_connection(thd) && thd->killed == KILL_CONNECTION)
  {
    (void)abort_replicated(thd);
    return 1;
  }
  return 0;
}

static void wsrep_close_thread(THD *thd)
{
  thd->set_killed(KILL_CONNECTION);
  MYSQL_CALLBACK(thread_scheduler, post_kill_notification, (thd));
  mysql_mutex_lock(&thd->LOCK_thd_kill);
  thd->abort_current_cond_wait(true);
  mysql_mutex_unlock(&thd->LOCK_thd_kill);
}

static my_bool have_committing_connections(THD *thd, void *)
{
  return is_client_connection(thd) && is_committing_connection(thd) ? 1 : 0;
}

int wsrep_wait_committing_connections_close(int wait_time)
{
  int sleep_time= 100;

  WSREP_DEBUG("wait for committing transaction to close: %d sleep: %d", wait_time, sleep_time);
  while (server_threads.iterate(have_committing_connections) && wait_time > 0)
  {
    WSREP_DEBUG("wait for committing transaction to close: %d", wait_time);
    my_sleep(sleep_time);
    wait_time -= sleep_time;
  }
  return server_threads.iterate(have_committing_connections);
}

static my_bool kill_all_threads(THD *thd, THD *caller_thd)
{
  DBUG_PRINT("quit", ("Informing thread %lld that it's time to die",
                      (longlong) thd->thread_id));
  /* We skip slave threads & scheduler on this first loop through. */
  if (is_client_connection(thd) && thd != caller_thd)
  {
    if (is_replaying_connection(thd))
      thd->set_killed(KILL_CONNECTION);
    else if (!abort_replicated(thd))
    {
      /* replicated transactions must be skipped */
      WSREP_DEBUG("closing connection %lld", (longlong) thd->thread_id);
      /* instead of wsrep_close_thread() we do now  soft kill by THD::awake */
      thd->awake(KILL_CONNECTION);
    }
  }
  return 0;
}

static my_bool kill_remaining_threads(THD *thd, THD *caller_thd)
{
#ifndef __bsdi__				// Bug in BSDI kernel
  if (is_client_connection(thd) &&
      !abort_replicated(thd)    &&
      !is_replaying_connection(thd) &&
      thd_is_connection_alive(thd) &&
      thd != caller_thd)
  {

    WSREP_INFO("killing local connection: %lld", (longlong) thd->thread_id);
    close_connection(thd);
  }
#endif
  return 0;
}

void wsrep_close_client_connections(my_bool wait_to_end, THD* except_caller_thd)
{
  /* Clear thread cache */
  thread_cache.final_flush();

  /*
    First signal all threads that it's time to die
  */
  server_threads.iterate(kill_all_threads, except_caller_thd);

  /*
    Force remaining threads to die by closing the connection to the client
  */
  server_threads.iterate(kill_remaining_threads, except_caller_thd);

  DBUG_PRINT("quit", ("Waiting for threads to die (count=%u)", THD_count::value()));
  WSREP_DEBUG("waiting for client connections to close: %u", THD_count::value());

  while (wait_to_end && server_threads.iterate(have_client_connections))
  {
    sleep(1);
    DBUG_PRINT("quit",("One thread died (count=%u)", THD_count::value()));
  }

  /* All client connection threads have now been aborted */
}


void wsrep_close_applier(THD *thd)
{
  WSREP_DEBUG("closing applier %lld", (longlong) thd->thread_id);
  wsrep_close_thread(thd);
}

static my_bool wsrep_close_threads_callback(THD *thd, THD *caller_thd)
{
  DBUG_PRINT("quit",("Informing thread %lld that it's time to die",
                     (longlong) thd->thread_id));
  /* We skip slave threads & scheduler on this first loop through. */
  if (thd->wsrep_applier && thd != caller_thd)
  {
    WSREP_DEBUG("closing wsrep thread %lld", (longlong) thd->thread_id);
    wsrep_close_thread(thd);
  }
  return 0;
}

void wsrep_close_threads(THD *thd)
{
  server_threads.iterate(wsrep_close_threads_callback, thd);
}

void wsrep_wait_appliers_close(THD *thd)
{
  /* Wait for wsrep appliers to gracefully exit */
  mysql_mutex_lock(&LOCK_wsrep_slave_threads);
  while (wsrep_running_threads > 2)
    /*
      2 is for rollbacker thread which needs to be killed explicitly.
      This gotta be fixed in a more elegant manner if we gonna have arbitrary
      number of non-applier wsrep threads.
    */
  {
    mysql_cond_wait(&COND_wsrep_slave_threads, &LOCK_wsrep_slave_threads);
  }
  mysql_mutex_unlock(&LOCK_wsrep_slave_threads);
  DBUG_PRINT("quit",("applier threads have died (count=%u)",
                     uint32_t(wsrep_running_threads)));

  /* Now kill remaining wsrep threads: rollbacker */
  wsrep_close_threads (thd);
  /* and wait for them to die */
  mysql_mutex_lock(&LOCK_wsrep_slave_threads);
  while (wsrep_running_threads > 0)
  {
    mysql_cond_wait(&COND_wsrep_slave_threads, &LOCK_wsrep_slave_threads);
  }
  mysql_mutex_unlock(&LOCK_wsrep_slave_threads);
  DBUG_PRINT("quit",("all wsrep system threads have died"));

  /* All wsrep applier threads have now been aborted. However, if this thread
     is also applier, we are still running...
  */
}
int wsrep_must_ignore_error(THD* thd)
{
  const int error= thd->get_stmt_da()->sql_errno();
  const uint flags= sql_command_flags[thd->lex->sql_command];

  DBUG_ASSERT(error);
  DBUG_ASSERT(wsrep_thd_is_toi(thd));

  if ((wsrep_ignore_apply_errors & WSREP_IGNORE_ERRORS_ON_DDL))
    goto ignore_error;

  if ((flags & CF_WSREP_MAY_IGNORE_ERRORS) &&
      (wsrep_ignore_apply_errors & WSREP_IGNORE_ERRORS_ON_RECONCILING_DDL))
  {
    switch (error)
    {
    case ER_DB_DROP_EXISTS:
    case ER_BAD_TABLE_ERROR:
    case ER_CANT_DROP_FIELD_OR_KEY:
      goto ignore_error;
    }
  }

  return 0;

ignore_error:
  WSREP_WARN("Ignoring error '%s' on query. "
             "Default database: '%s'. Query: '%s', Error_code: %d",
             thd->get_stmt_da()->message(),
             print_slave_db_safe(thd->db.str),
             thd->query(),
             error);
  return 1;
}

int wsrep_ignored_error_code(Log_event* ev, int error)
{
  const THD* thd= ev->thd;

  DBUG_ASSERT(error);
  DBUG_ASSERT(wsrep_thd_is_applying(thd) &&
              !wsrep_thd_is_local_toi(thd));

  if ((wsrep_ignore_apply_errors & WSREP_IGNORE_ERRORS_ON_RECONCILING_DML))
  {
    const int ev_type= ev->get_type_code();
    if ((ev_type == DELETE_ROWS_EVENT || ev_type == DELETE_ROWS_EVENT_V1)
        && error == ER_KEY_NOT_FOUND)
      goto ignore_error;
  }

  return 0;

ignore_error:
  WSREP_WARN("Ignoring error '%s' on %s event. Error_code: %d",
             thd->get_stmt_da()->message(),
             ev->get_type_str(),
             error);
  return 1;
}

bool wsrep_provider_is_SR_capable()
{
  return Wsrep_server_state::has_capability(wsrep::provider::capability::streaming);
}

int wsrep_thd_retry_counter(const THD *thd)
{
  return thd->wsrep_retry_counter;
}

extern  bool wsrep_thd_ignore_table(THD *thd)
{
  return thd->wsrep_ignore_table;
}

bool wsrep_create_like_table(THD* thd, TABLE_LIST* table,
                             TABLE_LIST* src_table,
                             HA_CREATE_INFO *create_info)
{
  if (create_info->tmp_table())
  {
    /* CREATE TEMPORARY TABLE LIKE must be skipped from replication */
    WSREP_DEBUG("CREATE TEMPORARY TABLE LIKE... skipped replication\n %s",
                thd->query());
  }
  else if (!(thd->find_temporary_table(src_table)))
  {
    /* this is straight CREATE TABLE LIKE... with no tmp tables */
    WSREP_TO_ISOLATION_BEGIN_CREATE(table->db.str, table->table_name.str, table, create_info);
  }
  else
  {
    /* Non-MERGE tables ignore this call. */
    if (src_table->table->file->extra(HA_EXTRA_ADD_CHILDREN_LIST))
      return (true);

    char buf[2048];
    String query(buf, sizeof(buf), system_charset_info);
    query.length(0);  // Have to zero it since constructor doesn't

    int result __attribute__((unused))=
      show_create_table(thd, src_table, &query, NULL, WITH_DB_NAME);
    WSREP_DEBUG("TMP TABLE: %s ret_code %d", query.ptr(), result);

    thd->wsrep_TOI_pre_query=     query.ptr();
    thd->wsrep_TOI_pre_query_len= query.length();

    WSREP_TO_ISOLATION_BEGIN_CREATE(table->db.str, table->table_name.str, table, create_info);

    thd->wsrep_TOI_pre_query=      NULL;
    thd->wsrep_TOI_pre_query_len= 0;

    /* Non-MERGE tables ignore this call. */
    src_table->table->file->extra(HA_EXTRA_DETACH_CHILDREN);
  }

  return(false);
#ifdef WITH_WSREP
wsrep_error_label:
  thd->wsrep_TOI_pre_query= NULL;
  return (true);
#endif
}

int wsrep_create_trigger_query(THD *thd, uchar** buf, size_t* buf_len)
{
  LEX *lex= thd->lex;
  String stmt_query;

  LEX_CSTRING definer_user;
  LEX_CSTRING definer_host;

  if (!lex->definer)
  {
    if (!thd->slave_thread)
    {
      if (!(lex->definer= create_default_definer(thd, false)))
        return 1;
    }
  }

  if (lex->definer)
  {
    /* SUID trigger. */
    LEX_USER *d= get_current_user(thd, lex->definer);

    if (!d)
      return 1;

    definer_user= d->user;
    definer_host= d->host;
  }
  else
  {
    /* non-SUID trigger. */

    definer_user.str= 0;
    definer_user.length= 0;

    definer_host.str= 0;
    definer_host.length= 0;
  }

  const LEX_CSTRING command[2]=
      {{ C_STRING_WITH_LEN("CREATE ") },
       { C_STRING_WITH_LEN("CREATE OR REPLACE ") }};

  if (thd->lex->create_info.or_replace())
    stmt_query.append(command[1]);
  else
    stmt_query.append(command[0]);

  append_definer(thd, &stmt_query, &definer_user, &definer_host);

  LEX_CSTRING stmt_definition;
  stmt_definition.str= (char*) thd->lex->stmt_definition_begin;
  stmt_definition.length= thd->lex->stmt_definition_end
    - thd->lex->stmt_definition_begin;
  trim_whitespace(thd->charset(), &stmt_definition);

  stmt_query.append(stmt_definition.str, stmt_definition.length);

  return wsrep_to_buf_helper(thd, stmt_query.c_ptr(), stmt_query.length(),
                             buf, buf_len);
}

void* start_wsrep_THD(void *arg)
{
  THD *thd= NULL;

  Wsrep_thd_args* thd_args= (Wsrep_thd_args*) arg;

  if (my_thread_init() || (!(thd= new THD(next_thread_id(), true))))
  {
    goto error;
  }

  statistic_increment(thread_created, &LOCK_status);

  thd->real_id=pthread_self(); // Keep purify happy

  my_net_init(&thd->net,(st_vio*) 0, thd, MYF(0));

  DBUG_PRINT("wsrep",(("creating thread %lld"), (long long)thd->thread_id));
  thd->prior_thr_create_utime= thd->start_utime= microsecond_interval_timer();

  server_threads.insert(thd);

  /* from bootstrap()... */
  thd->bootstrap=1;
  thd->max_client_packet_length= thd->net.max_packet;
  thd->security_ctx->master_access= ALL_KNOWN_ACL;

  /* from handle_one_connection... */
  pthread_detach_this_thread();

  mysql_thread_set_psi_id(thd->thread_id);
  thd->thr_create_utime=  microsecond_interval_timer();

  DBUG_EXECUTE_IF("wsrep_simulate_failed_connection_1", goto error; );
// </5.1.17>
  /*
    handle_one_connection() is normally the only way a thread would
    start and would always be on the very high end of the stack ,
    therefore, the thread stack always starts at the address of the
    first local variable of handle_one_connection, which is thd. We
    need to know the start of the stack so that we could check for
    stack overruns.
  */
  DBUG_PRINT("wsrep", ("handle_one_connection called by thread %lld",
                       (long long)thd->thread_id));
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */

  thd->thread_stack= (char*) &thd;
  wsrep_assign_from_threadvars(thd);
  wsrep_store_threadvars(thd);

  thd->system_thread= SYSTEM_THREAD_SLAVE_SQL;
  thd->security_ctx->skip_grants();

  /* handle_one_connection() again... */
  thd->proc_info= 0;
  thd->set_command(COM_SLEEP);
  thd->init_for_queries();
  mysql_mutex_lock(&LOCK_wsrep_slave_threads);

  wsrep_running_threads++;

  switch (thd_args->thread_type()) {
    case WSREP_APPLIER_THREAD:
      wsrep_running_applier_threads++;
      break;
    case WSREP_ROLLBACKER_THREAD:
      wsrep_running_rollbacker_threads++;
      break;
    default:
      WSREP_ERROR("Incorrect wsrep thread type: %d", thd_args->thread_type());
      break;
  }

  mysql_cond_broadcast(&COND_wsrep_slave_threads);
  mysql_mutex_unlock(&LOCK_wsrep_slave_threads);

  WSREP_DEBUG("wsrep system thread %llu, %p starting",
              thd->thread_id, thd);
  thd_args->fun()(thd, static_cast<void *>(thd_args));

  WSREP_DEBUG("wsrep system thread: %llu, %p closing",
              thd->thread_id, thd);

  /* Wsrep may reset globals during thread context switches, store globals
     before cleanup. */
  wsrep_store_threadvars(thd);

  close_connection(thd, 0);

  mysql_mutex_lock(&LOCK_wsrep_slave_threads);
  DBUG_ASSERT(wsrep_running_threads > 0);
  wsrep_running_threads--;

  switch (thd_args->thread_type()) {
    case WSREP_APPLIER_THREAD:
      DBUG_ASSERT(wsrep_running_applier_threads > 0);
      wsrep_running_applier_threads--;
      break;
    case WSREP_ROLLBACKER_THREAD:
      DBUG_ASSERT(wsrep_running_rollbacker_threads > 0);
      wsrep_running_rollbacker_threads--;
      break;
    default:
      WSREP_ERROR("Incorrect wsrep thread type: %d", thd_args->thread_type());
      break;
  }

  delete thd_args;
  WSREP_DEBUG("wsrep running threads now: %lu", wsrep_running_threads);
  mysql_cond_broadcast(&COND_wsrep_slave_threads);
  mysql_mutex_unlock(&LOCK_wsrep_slave_threads);
  /*
    Note: We can't call THD destructor without crashing
    if plugins have not been initialized. However, in most of the
    cases this means that pre SE initialization SST failed and
    we are going to exit anyway.
  */
  if (plugins_are_initialized)
  {
    net_end(&thd->net);
    unlink_thd(thd);
  }
  else
  {
    /*
      TODO: lightweight cleanup to get rid of:
      'Error in my_thread_global_end(): 2 threads didn't exit'
      at server shutdown
    */
    server_threads.erase(thd);
  }

  delete thd;
  my_thread_end();
  return(NULL);

error:
  WSREP_ERROR("Failed to create/initialize system thread");

  if (thd)
  {
    close_connection(thd, ER_OUT_OF_RESOURCES);
    statistic_increment(aborted_connects, &LOCK_status);
    server_threads.erase(thd);
    delete thd;
    my_thread_end();
  }
  delete thd_args;
  // This will signal error to wsrep_slave_threads_update
  wsrep_thread_create_failed.store(true, std::memory_order_relaxed);

  /* Abort if its the first applier/rollbacker thread. */
  if (!mysqld_server_initialized)
    unireg_abort(1);
  else
    return NULL;
}

enum wsrep::streaming_context::fragment_unit wsrep_fragment_unit(ulong unit)
{
  switch (unit)
  {
  case WSREP_FRAG_BYTES: return wsrep::streaming_context::bytes;
  case WSREP_FRAG_ROWS: return wsrep::streaming_context::row;
  case WSREP_FRAG_STATEMENTS: return wsrep::streaming_context::statement;
  default:
    DBUG_ASSERT(0);
    return wsrep::streaming_context::bytes;
  }
}

bool THD::wsrep_parallel_slave_wait_for_prior_commit()
{
  if (rgi_slave && rgi_slave->is_parallel_exec && wait_for_prior_commit())
  {
    return 1;
  }
  return 0;
}

/***** callbacks for wsrep service ************/

my_bool get_wsrep_recovery()
{
  return wsrep_recovery;
}

bool wsrep_consistency_check(THD *thd)
{
  return thd->wsrep_consistency_check == CONSISTENCY_CHECK_RUNNING;
}


/*
  Commit an empty transaction.

  If the transaction is real and the wsrep transaction is still active,
  the transaction did not generate any rows or keys and is committed
  as empty. Here the wsrep transaction is rolled back and after statement
  step is performed to leave the wsrep transaction in the state as it
  never existed.

  This should not be an inline functions as it requires a lot of stack space
  because of WSREP_DBUG() usage.  It's also not a function that is
  frequently called.
*/

void wsrep_commit_empty(THD* thd, bool all)
{
  DBUG_ENTER("wsrep_commit_empty");
  WSREP_DEBUG("wsrep_commit_empty for %llu client_state %s client_mode"
              " %s trans_state %s sql %s",
              thd_get_thread_id(thd),
              wsrep::to_c_string(thd->wsrep_cs().state()),
              wsrep::to_c_string(thd->wsrep_cs().mode()),
              wsrep::to_c_string(thd->wsrep_cs().transaction().state()),
              wsrep_thd_query(thd));

  if (wsrep_is_real(thd, all) &&
      wsrep_thd_is_local(thd) &&
      thd->wsrep_trx().active() &&
      !thd->internal_transaction() &&
      thd->wsrep_trx().state() != wsrep::transaction::s_committed)
  {
    /* Here transaction is either empty (i.e. no changes) or
       it was CREATE TABLE with no row binlog format or
       we have already aborted transaction e.g. because max writeset size
       has been reached. */
    DBUG_ASSERT(!wsrep_has_changes(thd) ||
                (thd->lex->sql_command == SQLCOM_CREATE_TABLE &&
                 !thd->is_current_stmt_binlog_format_row()) ||
                thd->wsrep_cs().transaction().state() == wsrep::transaction::s_aborted);
    bool have_error= wsrep_current_error(thd);
    int ret= wsrep_before_rollback(thd, all) ||
      wsrep_after_rollback(thd, all) ||
      wsrep_after_statement(thd);
    /* The committing transaction was empty but it held some locks and
       got BF aborted. As there were no certified changes in the
       data, we ignore the deadlock error and rely on error reporting
       by storage engine/server. */
    if (!ret && !have_error && wsrep_current_error(thd))
    {
      DBUG_ASSERT(wsrep_current_error(thd) == wsrep::e_deadlock_error);
      thd->wsrep_cs().reset_error();
    }
    if (ret)
    {
      WSREP_DEBUG("wsrep_commit_empty failed: %d", wsrep_current_error(thd));
    }
  }
  DBUG_VOID_RETURN;
}