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Commitef19c9d

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Fix postmaster to attempt restart after a hot-standby crash.
The postmaster was coded to treat any unexpected exit of the startupprocess (i.e., the WAL replay process) as a catastrophic crash, and not tryto restart it. This was OK so long as the startup process could not haveany sibling postmaster children. However, if a hot-standby backendcrashes, we SIGQUIT the startup process along with everything else, and theresulting exit is hardly "unexpected". Treating it as such meant we failedto restart a standby server after any child crash at all, not only a crashof the WAL replay process as intended. Adjust that. Back-patch to 9.0where hot standby was introduced.
1 parentc74ad4e commitef19c9d

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‎src/backend/postmaster/postmaster.c

Lines changed: 9 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -2391,13 +2391,18 @@ reaper(SIGNAL_ARGS)
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}
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/*
2394-
* Any unexpected exit (including FATAL exit) of the startup
2395-
* process is treated as a crash, except that we don't want to
2396-
* reinitialize.
2394+
* After PM_STARTUP, any unexpected exit (including FATAL exit) of
2395+
* the startup process is catastrophic, so kill other children,
2396+
* and set RecoveryError so we don't try to reinitialize after
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* they're gone. Exception: if FatalError is already set, that
2398+
* implies we previously sent the startup process a SIGQUIT, so
2399+
* that's probably the reason it died, and we do want to try to
2400+
* restart in that case.
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*/
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if (!EXIT_STATUS_0(exitstatus))
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{
2400-
RecoveryError= true;
2404+
if (!FatalError)
2405+
RecoveryError= true;
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HandleChildCrash(pid,exitstatus,
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_("startup process"));
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continue;

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