Merge mikael@ndb.mysql.com:/home/mikael/bug12594

into  mysql.com:/Users/mikron/mysql-4.1

4 files changed, 110 insertions, 74 deletions

diff --git a/ndb/src/kernel/blocks/dblqh/Dblqh.hpp b/ndb/src/kernel/blocks/dblqh/Dblqh.hpp
index 836fc9398e5..951d1e90251 100644
--- a/ndb/src/kernel/blocks/dblqh/Dblqh.hpp
+++ b/ndb/src/kernel/blocks/dblqh/Dblqh.hpp
@@ -86,6 +86,17 @@
 #define ZCURR_PAGE_INDEX 8
 #define ZLAST_LOG_PREP_REF 10
 #define ZPOS_DIRTY 11
+/* A number of debug items written in the page header of all log files */
+#define ZPOS_LOG_TIMER 12
+#define ZPOS_PAGE_I 13
+#define ZPOS_PLACE_WRITTEN_FROM 14
+#define ZPOS_PAGE_NO 15
+#define ZPOS_PAGE_FILE_NO 16
+#define ZPOS_WORD_WRITTEN 17
+#define ZPOS_IN_WRITING 18
+#define ZPOS_PREV_PAGE_NO 19
+#define ZPOS_IN_FREE_LIST 20
+
 /* ------------------------------------------------------------------------- */
 /*       CONSTANTS FOR THE VARIOUS REPLICA AND NODE TYPES.                   */
 /* ------------------------------------------------------------------------- */
@@ -2278,7 +2289,7 @@ private:
 			  const LogPartRecordPtr &sltLogPartPtr);
   void checkGcpCompleted(Signal* signal, Uint32 pageWritten, Uint32 wordWritten);
   void initFsopenconf(Signal* signal);
-  void initFsrwconf(Signal* signal);
+  void initFsrwconf(Signal* signal, bool write);
   void initLfo(Signal* signal);
   void initLogfile(Signal* signal, Uint32 fileNo);
   void initLogpage(Signal* signal);
@@ -2294,7 +2305,8 @@ private:
   void writeFileDescriptor(Signal* signal);
   void writeFileHeaderOpen(Signal* signal, Uint32 type);
   void writeInitMbyte(Signal* signal);
-  void writeSinglePage(Signal* signal, Uint32 pageNo, Uint32 wordWritten);
+  void writeSinglePage(Signal* signal, Uint32 pageNo,
+                       Uint32 wordWritten, Uint32 place);
   void buildLinkedLogPageList(Signal* signal);
   void changeMbyte(Signal* signal);
   Uint32 checkIfExecLog(Signal* signal);
@@ -2303,7 +2315,7 @@ private:
   void checkScanTcCompleted(Signal* signal);
   void checkSrCompleted(Signal* signal);
   void closeFile(Signal* signal, LogFileRecordPtr logFilePtr);
-  void completedLogPage(Signal* signal, Uint32 clpType);
+  void completedLogPage(Signal* signal, Uint32 clpType, Uint32 place);
   void deleteFragrec(Uint32 fragId);
   void deleteTransidHash(Signal* signal);
   void findLogfile(Signal* signal,
@@ -2399,7 +2411,9 @@ private:
   void writeAbortLog(Signal* signal);
   void writeCommitLog(Signal* signal, LogPartRecordPtr regLogPartPtr);
   void writeCompletedGciLog(Signal* signal);
-  void writeDirty(Signal* signal);
+  void writeDbgInfoPageHeader(LogPageRecordPtr logPagePtr, Uint32 place,
+                              Uint32 pageNo, Uint32 wordWritten);
+  void writeDirty(Signal* signal, Uint32 place);
   void writeKey(Signal* signal);
   void writeLogHeader(Signal* signal);
   void writeLogWord(Signal* signal, Uint32 data);
diff --git a/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp b/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp
index 5e2e6dc392c..b6178227d31 100644
--- a/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp
+++ b/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp
@@ -11749,42 +11749,34 @@ void Dblqh::execFSCLOSECONF(Signal* signal)
     ptrCheckGuard(logFilePtr, clogFileFileSize, logFileRecord);
     exitFromInvalidate(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_INIT:
     jam();
     closingInitLab(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_SR:
     jam();
     closingSrLab(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_EXEC_SR:
     jam();
     closeExecSrLab(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_EXEC_SR_COMPLETED:
     jam();
     closeExecSrCompletedLab(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_WRITE_LOG:
     jam();
     closeWriteLogLab(signal);
     return;
-    break;
   case LogFileRecord::CLOSING_EXEC_LOG:
     jam();
     closeExecLogLab(signal);
     return;
-    break;
   default:
     jam();
     systemErrorLab(signal);
     return;
-    break;
   }//switch
 }//Dblqh::execFSCLOSECONF()
 
@@ -11802,77 +11794,64 @@ void Dblqh::execFSOPENCONF(Signal* signal)
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     readFileInInvalidate(signal);
     return;
-    break;
   case LogFileRecord::OPENING_INIT:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openFileInitLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_FRONTPAGE:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrFrontpageLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_LAST_FILE:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrLastFileLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_NEXT_FILE:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrNextFileLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_EXEC_SR_START:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openExecSrStartLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_EXEC_SR_NEW_MBYTE:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openExecSrNewMbyteLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_FOURTH_PHASE:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrFourthPhaseLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_FOURTH_NEXT:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrFourthNextLab(signal);
     return;
-    break;
   case LogFileRecord::OPEN_SR_FOURTH_ZERO:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openSrFourthZeroLab(signal);
     return;
-    break;
   case LogFileRecord::OPENING_WRITE_LOG:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     return;
-    break;
   case LogFileRecord::OPEN_EXEC_LOG:
     jam();
     logFilePtr.p->logFileStatus = LogFileRecord::OPEN;
     openExecLogLab(signal);
     return;
-    break;
   default:
     jam();
     systemErrorLab(signal);
     return;
-    break;
   }//switch
 }//Dblqh::execFSOPENCONF()
 
@@ -11883,7 +11862,7 @@ void Dblqh::execFSOPENCONF(Signal* signal)
 void Dblqh::execFSREADCONF(Signal* signal) 
 {
   jamEntry();
-  initFsrwconf(signal);
+  initFsrwconf(signal, false);
 
   switch (lfoPtr.p->lfoState) {
   case LogFileOperationRecord::READ_SR_LAST_MBYTE:
@@ -11891,57 +11870,47 @@ void Dblqh::execFSREADCONF(Signal* signal)
     releaseLfo(signal);
     readSrLastMbyteLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_FRONTPAGE:
     jam();
     releaseLfo(signal);
     readSrFrontpageLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_LAST_FILE:
     jam();
     releaseLfo(signal);
     readSrLastFileLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_NEXT_FILE:
     jam();
     releaseLfo(signal);
     readSrNextFileLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_EXEC_SR:
     jam();
     readExecSrLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_EXEC_LOG:
     jam();
     readExecLogLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_INVALIDATE_PAGES:
     jam();
     invalidateLogAfterLastGCI(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_FOURTH_PHASE:
     jam();
     releaseLfo(signal);
     readSrFourthPhaseLab(signal);
     return;
-    break;
   case LogFileOperationRecord::READ_SR_FOURTH_ZERO:
     jam();
     releaseLfo(signal);
     readSrFourthZeroLab(signal);
     return;
-    break;
   default:
     jam();
     systemErrorLab(signal);
     return;
-    break;
   }//switch
 }//Dblqh::execFSREADCONF()
 
@@ -11998,63 +11967,52 @@ void Dblqh::execFSREADREF(Signal* signal)
 void Dblqh::execFSWRITECONF(Signal* signal) 
 {
   jamEntry();
-  initFsrwconf(signal);
+  initFsrwconf(signal, true);
   switch (lfoPtr.p->lfoState) {
   case LogFileOperationRecord::WRITE_SR_INVALIDATE_PAGES:
     jam();
     invalidateLogAfterLastGCI(signal);
     return;
-    break;
   case LogFileOperationRecord::WRITE_PAGE_ZERO:
     jam();
     writePageZeroLab(signal);
     return;
-    break;
   case LogFileOperationRecord::LAST_WRITE_IN_FILE:
     jam();
     lastWriteInFileLab(signal);
     return;
-    break;
   case LogFileOperationRecord::INIT_WRITE_AT_END:
     jam();
     initWriteEndLab(signal);
     return;
-    break;
   case LogFileOperationRecord::INIT_FIRST_PAGE:
     jam();
     initFirstPageLab(signal);
     return;
-    break;
   case LogFileOperationRecord::WRITE_GCI_ZERO:
     jam();
     writeGciZeroLab(signal);
     return;
-    break;
   case LogFileOperationRecord::WRITE_DIRTY:
     jam();
     writeDirtyLab(signal);
     return;
-    break;
   case LogFileOperationRecord::WRITE_INIT_MBYTE:
     jam();
     writeInitMbyteLab(signal);
     return;
-    break;
   case LogFileOperationRecord::ACTIVE_WRITE_LOG:
     jam();
     writeLogfileLab(signal);
     return;
-    break;
   case LogFileOperationRecord::FIRST_PAGE_WRITE_IN_LOGFILE:
     jam();
     firstPageWriteLab(signal);
     return;
-    break;
   default:
     jam();
     systemErrorLab(signal);
     return;
-    break;
   }//switch
 }//Dblqh::execFSWRITECONF()
 
@@ -12130,16 +12088,35 @@ void Dblqh::initFsopenconf(Signal* signal)
 /* =======       INITIATE WHEN RECEIVING FSREADCONF AND FSWRITECONF  ======= */
 /*                                                                           */
 /* ========================================================================= */
-void Dblqh::initFsrwconf(Signal* signal) 
+void Dblqh::initFsrwconf(Signal* signal, bool write) 
 {
+  LogPageRecordPtr logP;
+  Uint32 noPages, totPages;
   lfoPtr.i = signal->theData[0];
   ptrCheckGuard(lfoPtr, clfoFileSize, logFileOperationRecord);
+  totPages= lfoPtr.p->noPagesRw;
   logFilePtr.i = lfoPtr.p->logFileRec;
   ptrCheckGuard(logFilePtr, clogFileFileSize, logFileRecord);
   logPartPtr.i = logFilePtr.p->logPartRec;
   ptrCheckGuard(logPartPtr, clogPartFileSize, logPartRecord);
   logPagePtr.i = lfoPtr.p->firstLfoPage;
   ptrCheckGuard(logPagePtr, clogPageFileSize, logPageRecord);
+  logP= logPagePtr;
+  noPages= 1;
+  ndbassert(totPages > 0);
+  for (;;)
+  {
+    logP.p->logPageWord[ZPOS_IN_WRITING]= 0;
+    logP.p->logPageWord[ZPOS_IN_FREE_LIST]= 0;
+    if (noPages == totPages)
+      return;
+    if (write)
+      logP.i= logP.p->logPageWord[ZNEXT_PAGE];
+    else
+      logP.i= lfoPtr.p->logPageArray[noPages];
+    ptrCheckGuard(logP, clogPageFileSize, logPageRecord);
+    noPages++;
+  }
 }//Dblqh::initFsrwconf()
 
 /* ######################################################################### */
@@ -12227,7 +12204,7 @@ void Dblqh::timeSup(Signal* signal)
         ndbrequire(wordWritten < ZPAGE_SIZE);
         if (logFilePtr.p->noLogpagesInBuffer > 0) {
           jam();
-          completedLogPage(signal, ZENFORCE_WRITE);
+          completedLogPage(signal, ZENFORCE_WRITE, __LINE__);
 /*---------------------------------------------------------------------------*/
 /*SINCE WE ARE ONLY WRITING PART OF THE LAST PAGE WE HAVE TO UPDATE THE WORD */
 /*WRITTEN TO REFLECT THE REAL LAST WORD WRITTEN. WE ALSO HAVE TO MOVE THE    */
@@ -12249,7 +12226,8 @@ void Dblqh::timeSup(Signal* signal)
             releaseLogpage(signal);
           } else {
             jam();
-            writeSinglePage(signal, logFilePtr.p->currentFilepage, wordWritten);
+            writeSinglePage(signal, logFilePtr.p->currentFilepage,
+                            wordWritten, __LINE__);
             lfoPtr.p->lfoState = LogFileOperationRecord::ACTIVE_WRITE_LOG;
           }//if
         }//if
@@ -12385,7 +12363,7 @@ void Dblqh::firstPageWriteLab(Signal* signal)
       logPagePtr.i = logFilePtr.p->logPageZero;
       ptrCheckGuard(logPagePtr, clogPageFileSize, logPageRecord);
       logPagePtr.p->logPageWord[ZPAGE_HEADER_SIZE + ZPOS_FILE_NO] = fileNo;
-      writeSinglePage(signal, 0, ZPAGE_SIZE - 1);
+      writeSinglePage(signal, 0, ZPAGE_SIZE - 1, __LINE__);
       lfoPtr.p->logFileRec = currLogFile;
       lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_PAGE_ZERO;
       return;
@@ -12474,7 +12452,7 @@ void Dblqh::lastWriteInFileLab(Signal* signal)
       logPagePtr.i = logFilePtr.p->logPageZero;
       ptrCheckGuard(logPagePtr, clogPageFileSize, logPageRecord);
       logPagePtr.p->logPageWord[ZPAGE_HEADER_SIZE + ZPOS_FILE_NO] = fileNo;
-      writeSinglePage(signal, 0, ZPAGE_SIZE - 1);
+      writeSinglePage(signal, 0, ZPAGE_SIZE - 1, __LINE__);
       lfoPtr.p->logFileRec = currLogFile;
       lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_PAGE_ZERO;
       return;
@@ -12509,7 +12487,8 @@ void Dblqh::openFileInitLab(Signal* signal)
 {
   logFilePtr.p->logFileStatus = LogFileRecord::OPEN_INIT;
   seizeLogpage(signal);
-  writeSinglePage(signal, (ZNO_MBYTES_IN_FILE * ZPAGES_IN_MBYTE) - 1, ZPAGE_SIZE - 1);
+  writeSinglePage(signal, (ZNO_MBYTES_IN_FILE * ZPAGES_IN_MBYTE) - 1,
+                  ZPAGE_SIZE - 1, __LINE__);
   lfoPtr.p->lfoState = LogFileOperationRecord::INIT_WRITE_AT_END;
   return;
 }//Dblqh::openFileInitLab()
@@ -12550,7 +12529,7 @@ void Dblqh::initFirstPageLab(Signal* signal)
     logPagePtr.p->logPageWord[ZPOS_LOG_LAP] = 1;
     logPagePtr.p->logPageWord[ZPAGE_HEADER_SIZE] = ZCOMPLETED_GCI_TYPE;
     logPagePtr.p->logPageWord[ZPAGE_HEADER_SIZE + 1] = 1;
-    writeSinglePage(signal, 1, ZPAGE_SIZE - 1);
+    writeSinglePage(signal, 1, ZPAGE_SIZE - 1, __LINE__);
     lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_GCI_ZERO;
     return;
   }//if
@@ -12852,17 +12831,13 @@ void Dblqh::releaseLogpage(Signal* signal)
 {
 #ifdef VM_TRACE
   // Check that log page isn't already in free list
-  LogPageRecordPtr TlogPagePtr;
-  TlogPagePtr.i = cfirstfreeLogPage;
-  while (TlogPagePtr.i != RNIL){
-    ptrCheckGuard(TlogPagePtr, clogPageFileSize, logPageRecord);
-    ndbrequire(TlogPagePtr.i != logPagePtr.i);
-    TlogPagePtr.i = TlogPagePtr.p->logPageWord[ZNEXT_PAGE];
-  }
+  ndbrequire(logPagePtr.p->logPageWord[ZPOS_IN_FREE_LIST] == 0);
 #endif
 
   cnoOfLogPages++;
   logPagePtr.p->logPageWord[ZNEXT_PAGE] = cfirstfreeLogPage;
+  logPagePtr.p->logPageWord[ZPOS_IN_WRITING]= 0;
+  logPagePtr.p->logPageWord[ZPOS_IN_FREE_LIST]= 1;
   cfirstfreeLogPage = logPagePtr.i;
 }//Dblqh::releaseLogpage()
 
@@ -12908,6 +12883,7 @@ void Dblqh::seizeLogpage(Signal* signal)
 /* ------------------------------------------------------------------------- */
   cfirstfreeLogPage = logPagePtr.p->logPageWord[ZNEXT_PAGE];
   logPagePtr.p->logPageWord[ZNEXT_PAGE] = RNIL;
+  logPagePtr.p->logPageWord[ZPOS_IN_FREE_LIST] = 0;
 }//Dblqh::seizeLogpage()
 
 /* ------------------------------------------------------------------------- */
@@ -13015,7 +12991,7 @@ WMO_LOOP:
 /*       LOG FILE. THIS HAS SPECIAL SIGNIFANCE TO FIND     */
 /*       THE END OF THE LOG AT SYSTEM RESTART.             */
 /* ------------------------------------------------------- */
-  writeSinglePage(signal, 0, ZPAGE_SIZE - 1);
+  writeSinglePage(signal, 0, ZPAGE_SIZE - 1, __LINE__);
   if (wmoType == ZINIT) {
     jam();
     lfoPtr.p->lfoState = LogFileOperationRecord::INIT_FIRST_PAGE;
@@ -13049,7 +13025,8 @@ WMO_LOOP:
 void Dblqh::writeInitMbyte(Signal* signal) 
 {
   initLogpage(signal);
-  writeSinglePage(signal, logFilePtr.p->currentMbyte * ZPAGES_IN_MBYTE, ZPAGE_SIZE - 1);
+  writeSinglePage(signal, logFilePtr.p->currentMbyte * ZPAGES_IN_MBYTE,
+                  ZPAGE_SIZE - 1, __LINE__);
   lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_INIT_MBYTE;
 }//Dblqh::writeInitMbyte()
 
@@ -13059,13 +13036,15 @@ void Dblqh::writeInitMbyte(Signal* signal)
 /*       INPUT:          TWSP_PAGE_NO    THE PAGE NUMBER WRITTEN             */
 /*       SUBROUTINE SHORT NAME:  WSP                                         */
 /* ------------------------------------------------------------------------- */
-void Dblqh::writeSinglePage(Signal* signal, Uint32 pageNo, Uint32 wordWritten) 
+void Dblqh::writeSinglePage(Signal* signal, Uint32 pageNo,
+                            Uint32 wordWritten, Uint32 place) 
 {
   seizeLfo(signal);
   initLfo(signal);
   lfoPtr.p->firstLfoPage = logPagePtr.i;
   logPagePtr.p->logPageWord[ZNEXT_PAGE] = RNIL;
 
+  writeDbgInfoPageHeader(logPagePtr, place, pageNo, wordWritten);
   // Calculate checksum for page
   logPagePtr.p->logPageWord[ZPOS_CHECKSUM] = calcPageCheckSum(logPagePtr);
 
@@ -14534,7 +14513,7 @@ void Dblqh::execSr(Signal* signal)
 	 *  IN THIS WE HAVE COMPLETED EXECUTION OF THE CURRENT LOG PAGE
 	 *  AND CAN WRITE IT TO DISK SINCE IT IS DIRTY.
 	 * ----------------------------------------------------------------- */
-        writeDirty(signal);
+        writeDirty(signal, __LINE__);
         return;
         break;
       case LogPartRecord::LES_EXEC_LOG:
@@ -14545,7 +14524,7 @@ void Dblqh::execSr(Signal* signal)
        * ------------------------------------------------------------------- */
         if (logFilePtr.p->currentLogpage != logPartPtr.p->prevLogpage) {
           jam();
-          writeDirty(signal);
+          writeDirty(signal, __LINE__);
           return;
         }//if
         break;
@@ -14989,7 +14968,8 @@ void Dblqh::invalidateLogAfterLastGCI(Signal* signal) {
       // This page must be invalidated.
       logPagePtr.p->logPageWord[ZPOS_LOG_LAP] = 0;
       // Contact NDBFS. Real time break.
-      writeSinglePage(signal, logPartPtr.p->invalidatePageNo, ZPAGE_SIZE - 1);
+      writeSinglePage(signal, logPartPtr.p->invalidatePageNo,
+                      ZPAGE_SIZE - 1, __LINE__);
       lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_SR_INVALIDATE_PAGES;
     } else {
       // We are done with invalidating. Finish start phase 3.4. 
@@ -15937,7 +15917,7 @@ void Dblqh::closeFile(Signal* signal, LogFileRecordPtr clfLogFilePtr)
 // logPartPtr
 // Defines lfoPtr
 /* ---------------------------------------------------------------- */
-void Dblqh::completedLogPage(Signal* signal, Uint32 clpType) 
+void Dblqh::completedLogPage(Signal* signal, Uint32 clpType, Uint32 place) 
 {
   LogPageRecordPtr clpLogPagePtr;
   LogPageRecordPtr wlpLogPagePtr;
@@ -15980,6 +15960,9 @@ void Dblqh::completedLogPage(Signal* signal, Uint32 clpType)
     twlpNoPages++;
     ptrCheckGuard(wlpLogPagePtr, clogPageFileSize, logPageRecord);
 
+    writeDbgInfoPageHeader(wlpLogPagePtr, place,
+                           logFilePtr.p->filePosition + twlpNoPages - 1,
+                           ZPAGE_SIZE);
     // Calculate checksum for page
     wlpLogPagePtr.p->logPageWord[ZPOS_CHECKSUM] = calcPageCheckSum(wlpLogPagePtr);
     wlpLogPagePtr.i = wlpLogPagePtr.p->logPageWord[ZNEXT_PAGE];
@@ -16382,6 +16365,8 @@ void Dblqh::initialiseLogPage(Signal* signal)
       refresh_watch_dog();
       ptrAss(logPagePtr, logPageRecord);
       logPagePtr.p->logPageWord[ZNEXT_PAGE] = logPagePtr.i + 1;
+      logPagePtr.p->logPageWord[ZPOS_IN_FREE_LIST]= 1;
+      logPagePtr.p->logPageWord[ZPOS_IN_WRITING]= 0;
     }//for
     logPagePtr.i = clogPageFileSize - 1;
     ptrAss(logPagePtr, logPageRecord);
@@ -18038,10 +18023,14 @@ void Dblqh::writeCompletedGciLog(Signal* signal)
  * 
  *     SUBROUTINE SHORT NAME: WD
  * ------------------------------------------------------------------------- */
-void Dblqh::writeDirty(Signal* signal) 
+void Dblqh::writeDirty(Signal* signal, Uint32 place) 
 {
   logPagePtr.p->logPageWord[ZPOS_DIRTY] = ZNOT_DIRTY;
 
+  ndbassert(logPartPtr.p->prevFilepage ==
+            logPagePtr.p->logPageWord[ZPOS_PAGE_NO]);
+  writeDbgInfoPageHeader(logPagePtr, place, logPartPtr.p->prevFilepage,
+                         ZPAGE_SIZE);
   // Calculate checksum for page
   logPagePtr.p->logPageWord[ZPOS_CHECKSUM] = calcPageCheckSum(logPagePtr);
 
@@ -18075,7 +18064,7 @@ void Dblqh::writeLogWord(Signal* signal, Uint32 data)
   logPagePtr.p->logPageWord[ZCURR_PAGE_INDEX] = logPos + 1;
   if ((logPos + 1) == ZPAGE_SIZE) {
     jam();
-    completedLogPage(signal, ZNORMAL);
+    completedLogPage(signal, ZNORMAL, __LINE__);
     seizeLogpage(signal);
     initLogpage(signal);
     logFilePtr.p->currentLogpage = logPagePtr.i;
@@ -18133,7 +18122,7 @@ void Dblqh::writeNextLog(Signal* signal)
 /* -------------------------------------------------- */
 /*       WE HAVE TO CHANGE LOG FILE                   */
 /* -------------------------------------------------- */
-    completedLogPage(signal, ZLAST_WRITE_IN_FILE);
+    completedLogPage(signal, ZLAST_WRITE_IN_FILE, __LINE__);
     if (wnlNextLogFilePtr.p->fileNo == 0) {
       jam();
 /* -------------------------------------------------- */
@@ -18152,7 +18141,7 @@ void Dblqh::writeNextLog(Signal* signal)
 /*       INCREMENT THE CURRENT MBYTE                  */
 /*       SET PAGE INDEX TO PAGE HEADER SIZE           */
 /* -------------------------------------------------- */
-    completedLogPage(signal, ZENFORCE_WRITE);
+    completedLogPage(signal, ZENFORCE_WRITE, __LINE__);
     twnlNewMbyte = logFilePtr.p->currentMbyte + 1;
   }//if
 /* -------------------------------------------------- */
@@ -18520,3 +18509,16 @@ Uint32 Dblqh::calcPageCheckSum(LogPageRecordPtr logP){
     return checkSum;  
   }
 
+void Dblqh::writeDbgInfoPageHeader(LogPageRecordPtr logP, Uint32 place,
+                                   Uint32 pageNo, Uint32 wordWritten)
+{
+  logP.p->logPageWord[ZPOS_LOG_TIMER]= logPartPtr.p->logTimer;
+  logP.p->logPageWord[ZPOS_PREV_PAGE_NO]= logP.p->logPageWord[ZPOS_PAGE_NO];
+  logP.p->logPageWord[ZPOS_PAGE_I]= logP.i;
+  logP.p->logPageWord[ZPOS_PLACE_WRITTEN_FROM]= place;
+  logP.p->logPageWord[ZPOS_PAGE_NO]= pageNo;
+  logP.p->logPageWord[ZPOS_PAGE_FILE_NO]= logFilePtr.p->fileNo;
+  logP.p->logPageWord[ZPOS_WORD_WRITTEN]= wordWritten;
+  logP.p->logPageWord[ZPOS_IN_WRITING]= 1;
+}
+
diff --git a/ndb/src/kernel/blocks/dblqh/redoLogReader/records.cpp b/ndb/src/kernel/blocks/dblqh/redoLogReader/records.cpp
index b7e2ab072b5..6eadefe5df5 100644
--- a/ndb/src/kernel/blocks/dblqh/redoLogReader/records.cpp
+++ b/ndb/src/kernel/blocks/dblqh/redoLogReader/records.cpp
@@ -266,7 +266,16 @@ NdbOut& operator<<(NdbOut& no, const PageHeader& ph) {
   printOut("Current page index:",  ph.m_current_page_index);
   printOut("Oldest prepare op. file No.:", ph.m_old_prepare_file_number);	 
   printOut("Oldest prepare op. page ref.:",  ph.m_old_prepare_page_reference);	 
-  printOut("Dirty flag:", ph.m_dirty_flag);	 
+  printOut("Dirty flag:", ph.m_dirty_flag);
+  printOut("Write Timer:", ph.m_log_timer);
+  printOut("Page i-val:", ph.m_page_i_value);
+  printOut("Place written:", ph.m_place_written_from);
+  printOut("Page No in File:", ph.m_page_no);
+  printOut("File No:", ph.m_file_no);
+  printOut("Word Written:", ph.m_word_written);
+  printOut("In Writing (should be 1)", ph.m_in_writing_flag);
+  printOut("Prev Page No (can be garbage)", ph.m_prev_page_no);
+  printOut("In Free List (should be 0):", ph.m_in_free_list);
   no << endl;
   return no;
 }
diff --git a/ndb/src/kernel/blocks/dblqh/redoLogReader/records.hpp b/ndb/src/kernel/blocks/dblqh/redoLogReader/records.hpp
index b2da7427f4e..06bf7a85d53 100644
--- a/ndb/src/kernel/blocks/dblqh/redoLogReader/records.hpp
+++ b/ndb/src/kernel/blocks/dblqh/redoLogReader/records.hpp
@@ -147,6 +147,17 @@ protected:
   Uint32 m_old_prepare_file_number;
   Uint32 m_old_prepare_page_reference;
   Uint32 m_dirty_flag;
+/* Debug info Start */
+  Uint32 m_log_timer;
+  Uint32 m_page_i_value;
+  Uint32 m_place_written_from;
+  Uint32 m_page_no;
+  Uint32 m_file_no;
+  Uint32 m_word_written;
+  Uint32 m_in_writing_flag;
+  Uint32 m_prev_page_no;
+  Uint32 m_in_free_list;
+/* Debug info End */
 };
 
 //----------------------------------------------------------------