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Enable logical slots to follow timeline switches

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When decoding from a logical slot, it's necessary for xlog reading to be
able to read xlog from historical (i.e. not current) timelines;
otherwise, decoding fails after failover, because the archives are in
the historical timeline.  This is required to make "failover logical
slots" possible; it currently has no other use, although theoretically
it could be used by an extension that creates a slot on a standby and
continues to replay from the slot when the standby is promoted.

This commit includes a module in src/test/modules with functions to
manipulate the slots (which is not otherwise possible in SQL code) in
order to enable testing, and a new test in src/test/recovery to ensure
that the behavior is as expected.

Author: Craig Ringer
Reviewed-By: Oleksii Kliukin, Andres Freund, Petr Jelínek
This commit is contained in:
Alvaro Herrera
2016-03-30 20:07:05 -03:00
parent 3b02ea4f07
commit 24c5f1a103
16 changed files with 789 additions and 30 deletions
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9
src/backend/access/transam/xlogreader.c
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@ -118,6 +118,11 @@ XLogReaderAllocate(XLogPageReadCB pagereadfunc, void *private_data)
return NULL;
}
#ifndef FRONTEND
/* Will be loaded on first read */
state->timelineHistory = NIL;
#endif
return state;
}
@ -137,6 +142,10 @@ XLogReaderFree(XLogReaderState *state)
pfree(state->errormsg_buf);
if (state->readRecordBuf)
pfree(state->readRecordBuf);
#ifndef FRONTEND
if (state->timelineHistory)
list_free_deep(state->timelineHistory);
#endif
pfree(state->readBuf);
pfree(state);
}