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Properly initialize write, flush and replay locations in walsender slots 

These would leak random xlog positions if a walsender used for backup would
a walsender slot previously used by a replication walsender.

In passing also fix a couple of cases where the xlog pointer is directly
compared to zero instead of using XLogRecPtrIsInvalid, noted by
Michael Paquier.
This commit is contained in:
Magnus Hagander 2015-12-13 16:40:37 +01:00
parent 6d96cd077b
commit 263c19572b
1 changed files with 6 additions and 3 deletions
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9
src/backend/replication/walsender.c
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@ -1962,6 +1962,9 @@ InitWalSenderSlot(void)
*/
walsnd->pid = MyProcPid;
walsnd->sentPtr = InvalidXLogRecPtr;
walsnd->write = InvalidXLogRecPtr;
walsnd->flush = InvalidXLogRecPtr;
walsnd->apply = InvalidXLogRecPtr;
walsnd->state = WALSNDSTATE_STARTUP;
walsnd->latch = &MyProc->procLatch;
SpinLockRelease(&walsnd->mutex);
@ -2821,15 +2824,15 @@ pg_stat_get_wal_senders(PG_FUNCTION_ARGS)
values[1] = CStringGetTextDatum(WalSndGetStateString(state));
values[2] = LSNGetDatum(sentPtr);
if (write == 0)
if (XLogRecPtrIsInvalid(write))
nulls[3] = true;
values[3] = LSNGetDatum(write);
if (flush == 0)
if (XLogRecPtrIsInvalid(flush))
nulls[4] = true;
values[4] = LSNGetDatum(flush);
if (apply == 0)
if (XLogRecPtrIsInvalid(apply))
nulls[5] = true;
values[5] = LSNGetDatum(apply);