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Add archive_mode='always' option.

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In 'always' mode, the standby independently archives all files it receives
from the primary.

Original patch by Fujii Masao, docs and review by me.
This commit is contained in:
Heikki Linnakangas
2015-05-15 18:55:24 +03:00
parent f6d65f0c70
commit ffd37740ee
9 changed files with 133 additions and 29 deletions
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37
src/backend/postmaster/postmaster.c
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@@ -828,9 +828,9 @@ PostmasterMain(int argc, char *argv[])
write_stderr("%s: max_wal_senders must be less than max_connections\n", progname);
ExitPostmaster(1);
}
if (XLogArchiveMode && wal_level == WAL_LEVEL_MINIMAL)
if (XLogArchiveMode > ARCHIVE_MODE_OFF && wal_level == WAL_LEVEL_MINIMAL)
ereport(ERROR,
(errmsg("WAL archival (archive_mode=on) requires wal_level \"archive\", \"hot_standby\", or \"logical\"")));
(errmsg("WAL archival cannot be enabled when wal_level is \"minimal\"")));
if (max_wal_senders > 0 && wal_level == WAL_LEVEL_MINIMAL)
ereport(ERROR,
(errmsg("WAL streaming (max_wal_senders > 0) requires wal_level \"archive\", \"hot_standby\", or \"logical\"")));
@@ -1645,13 +1645,21 @@ ServerLoop(void)
start_autovac_launcher = false; /* signal processed */
}
/* If we have lost the archiver, try to start a new one */
if (XLogArchivingActive() && PgArchPID == 0 && pmState == PM_RUN)
PgArchPID = pgarch_start();
/* If we have lost the stats collector, try to start a new one */
if (PgStatPID == 0 && pmState == PM_RUN)
PgStatPID = pgstat_start();
/*
* If we have lost the archiver, try to start a new one.
*
* If WAL archiving is enabled always, we try to start a new archiver
* even during recovery.
*/
if (PgArchPID == 0 && wal_level >= WAL_LEVEL_ARCHIVE)
{
if ((pmState == PM_RUN && XLogArchiveMode > ARCHIVE_MODE_OFF) ||
((pmState == PM_RECOVERY || pmState == PM_HOT_STANDBY) &&
XLogArchiveMode == ARCHIVE_MODE_ALWAYS))
{
PgArchPID = pgarch_start();
}
}
/* If we need to signal the autovacuum launcher, do so now */
if (avlauncher_needs_signal)
@@ -4807,6 +4815,17 @@ sigusr1_handler(SIGNAL_ARGS)
Assert(BgWriterPID == 0);
BgWriterPID = StartBackgroundWriter();
/*
* Start the archiver if we're responsible for (re-)archiving received
* files.
*/
Assert(PgArchPID == 0);
if (wal_level >= WAL_LEVEL_ARCHIVE &&
XLogArchiveMode == ARCHIVE_MODE_ALWAYS)
{
PgArchPID = pgarch_start();
}
pmState = PM_RECOVERY;
}
if (CheckPostmasterSignal(PMSIGNAL_BEGIN_HOT_STANDBY) &&