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
|
/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __logmgr_config --
* Parse and setup the logging server options.
*/
static int
__logmgr_config(WT_SESSION_IMPL *session, const char **cfg, int *runp)
{
static const struct {
const char *name;
uint32_t flag;
} *st, sync_types[] = {
{ "dsync", WT_LOG_DSYNC},
{ "fsync", WT_LOG_FSYNC},
{ "none", 0 },
{ NULL, 0 }
};
WT_CONFIG_ITEM cval, sval;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
/*
* The logging configuration is off by default.
*/
WT_RET(__wt_config_gets(session, cfg, "log.enabled", &cval));
*runp = cval.val != 0;
if (*runp == 0)
return (0);
WT_RET(__wt_config_gets(session, cfg, "log.archive", &cval));
conn->archive = cval.val != 0;
WT_RET(__wt_config_gets(session, cfg, "log.file_max", &cval));
conn->log_file_max = (off_t)cval.val;
WT_STAT_FAST_CONN_SET(session, log_max_filesize, conn->log_file_max);
WT_RET(__wt_config_gets(session, cfg, "log.path", &cval));
WT_RET(__wt_strndup(session, cval.str, cval.len, &conn->log_path));
conn->txn_logsync = WT_LOG_DSYNC;
WT_RET(__wt_config_gets(session, cfg, "transaction_sync", &cval));
for (st = sync_types; st->name != NULL; st++) {
ret = __wt_config_subgets(session, &cval, st->name, &sval);
if (ret == 0) {
if (sval.val)
conn->txn_logsync = st->flag;
} else if (ret != WT_NOTFOUND)
goto err;
}
ret = 0;
err:
return (ret);
}
/*
* __log_archive_server --
* The log archiving server thread.
*/
static void *
__log_archive_server(void *arg)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
WT_LOG *log;
WT_LSN lsn;
WT_SESSION_IMPL *session;
uint32_t lognum;
u_int i, logcount;
char **logfiles;
session = arg;
conn = S2C(session);
log = conn->log;
logcount = 0;
logfiles = NULL;
while (F_ISSET(conn, WT_CONN_SERVER_RUN)) {
/*
* If archiving is reconfigured and turned off, wait until it
* gets turned back on and check again. Don't wait forever: if
* a notification gets lost during close, we want to find out
* eventually.
*/
if (conn->archive == 0) {
WT_ERR_TIMEDOUT_OK(
__wt_cond_wait(session, conn->arch_cond, 1000000));
continue;
}
lsn = log->ckpt_lsn;
lsn.offset = 0;
WT_VERBOSE_ERR(session, log,
"log_archive: ckpt LSN %" PRIu32 ",%" PRIu64,
lsn.file, lsn.offset);
/*
* Main archive code. Get the list of all log files and
* remove any earlier than the checkpoint LSN.
*/
WT_ERR(__wt_dirlist(session, conn->log_path,
WT_LOG_FILENAME, WT_DIRLIST_INCLUDE, &logfiles, &logcount));
/*
* We can only archive files if a hot backup is not in progress.
*/
__wt_spin_lock(session, &conn->hot_backup_lock);
for (i = 0; i < logcount; i++) {
if (conn->hot_backup == 0) {
WT_ERR(__wt_log_extract_lognum(
session, logfiles[i], &lognum));
if (lognum < lsn.file)
WT_ERR(
__wt_log_remove(session, lognum));
}
}
__wt_spin_unlock(session, &conn->hot_backup_lock);
__wt_log_files_free(session, logfiles, logcount);
logfiles = NULL;
logcount = 0;
/*
* Indicate what is our new earliest LSN. It is the start
* of the log file containing the last checkpoint.
*/
log->first_lsn = lsn;
log->first_lsn.offset = 0;
/* Wait until the next event. */
WT_ERR_TIMEDOUT_OK(
__wt_cond_wait(session, conn->arch_cond, 1000000));
}
if (0) {
err: __wt_err(session, ret, "log archive server error");
}
if (logfiles != NULL)
__wt_log_files_free(session, logfiles, logcount);
return (NULL);
}
/*
* __wt_logmgr_create --
* Start the log subsystem and archive server thread.
*/
int
__wt_logmgr_create(WT_CONNECTION_IMPL *conn, const char *cfg[])
{
WT_SESSION_IMPL *session;
WT_LOG *log;
int run;
session = conn->default_session;
/* Handle configuration. */
WT_RET(__logmgr_config(session, cfg, &run));
/* If logging is not configured, we're done. */
if (!run)
return (0);
conn->logging = 1;
/*
* Logging is on, allocate the WT_LOG structure and open the log file.
*/
WT_RET(__wt_calloc(session, 1, sizeof(WT_LOG), &conn->log));
log = conn->log;
WT_RET(__wt_spin_init(session, &log->log_lock, "log"));
WT_RET(__wt_spin_init(session, &log->log_slot_lock, "log slot"));
WT_RET(__wt_spin_init(session, &log->log_sync_lock, "log sync"));
if (FLD_ISSET(conn->direct_io, WT_FILE_TYPE_LOG))
log->allocsize =
WT_MAX((uint32_t)conn->buffer_alignment, LOG_ALIGN);
else
log->allocsize = LOG_ALIGN;
INIT_LSN(&log->alloc_lsn);
INIT_LSN(&log->ckpt_lsn);
INIT_LSN(&log->first_lsn);
INIT_LSN(&log->sync_lsn);
INIT_LSN(&log->trunc_lsn);
INIT_LSN(&log->write_lsn);
log->fileid = 0;
WT_RET(__wt_cond_alloc(session,
"log sync", 0, &log->log_sync_cond));
WT_RET(__wt_log_open(session));
WT_RET(__wt_log_slot_init(session));
/* If archiving is not configured, we're done. */
if (!conn->archive)
return (0);
/*
* If an archive thread exists, the user may have reconfigured the
* archive thread. Signal the thread. Otherwise the user wants
* archiving and we need to start up the thread.
*/
if (conn->arch_session != NULL) {
WT_ASSERT(session, conn->arch_cond != NULL);
WT_ASSERT(session, conn->arch_tid_set != 0);
WT_RET(__wt_cond_signal(session, conn->arch_cond));
} else {
/* The log archive server gets its own session. */
WT_RET(__wt_open_session(
conn, 1, NULL, NULL, &conn->arch_session));
conn->arch_session->name = "archive-server";
WT_RET(__wt_cond_alloc(
session, "log archiving server", 0, &conn->arch_cond));
/*
* Start the thread.
*/
WT_RET(__wt_thread_create(session,
&conn->arch_tid, __log_archive_server, conn->arch_session));
conn->arch_tid_set = 1;
}
return (0);
}
/*
* __wt_logmgr_destroy --
* Destroy the log archiving server thread and logging subsystem.
*/
int
__wt_logmgr_destroy(WT_CONNECTION_IMPL *conn)
{
WT_DECL_RET;
WT_SESSION *wt_session;
WT_SESSION_IMPL *session;
session = conn->default_session;
if (!conn->logging)
return (0);
if (conn->arch_tid_set) {
WT_TRET(__wt_cond_signal(session, conn->arch_cond));
WT_TRET(__wt_thread_join(session, conn->arch_tid));
conn->arch_tid_set = 0;
}
WT_TRET(__wt_cond_destroy(session, &conn->arch_cond));
WT_TRET(__wt_log_close(session));
__wt_free(session, conn->log_path);
/* Close the server thread's session. */
if (conn->arch_session != NULL) {
wt_session = &conn->arch_session->iface;
WT_TRET(wt_session->close(wt_session, NULL));
conn->arch_session = NULL;
}
WT_TRET(__wt_log_slot_destroy(session));
WT_TRET(__wt_cond_destroy(session, &conn->log->log_sync_cond));
__wt_spin_destroy(session, &conn->log->log_lock);
__wt_spin_destroy(session, &conn->log->log_slot_lock);
__wt_spin_destroy(session, &conn->log->log_sync_lock);
__wt_free(session, conn->log);
return (ret);
}
|
