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Change pg_last_xlog_receive_location() not to move backwards. That makes

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it a lot more useful for determining which standby is most up-to-date,
for example. There was long discussions on whether overwriting existing
existing WAL makes sense to begin with, and whether we should do some more
extensive variable renaming, but this change nevertheless seems quite
uncontroversial.

Fujii Masao, reviewed by Jeff Janes, Robert Haas, Stephen Frost.
This commit is contained in:
Heikki Linnakangas
2011-03-01 20:46:57 +02:00
parent 47ad79122b
commit 6eba5a7c57
4 changed files with 29 additions and 13 deletions
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9
src/backend/replication/walreceiver.c
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@ -218,7 +218,7 @@ WalReceiverMain(void)
/* Fetch information required to start streaming */
strlcpy(conninfo, (char *) walrcv->conninfo, MAXCONNINFO);
startpoint = walrcv->receivedUpto;
startpoint = walrcv->receiveStart;
SpinLockRelease(&walrcv->mutex);
/* Arrange to clean up at walreceiver exit */
@ -558,8 +558,11 @@ XLogWalRcvFlush(bool dying)
/* Update shared-memory status */
SpinLockAcquire(&walrcv->mutex);
walrcv->latestChunkStart = walrcv->receivedUpto;
walrcv->receivedUpto = LogstreamResult.Flush;
if (XLByteLT(walrcv->receivedUpto, LogstreamResult.Flush))
{
walrcv->latestChunkStart = walrcv->receivedUpto;
walrcv->receivedUpto = LogstreamResult.Flush;
}
SpinLockRelease(&walrcv->mutex);
/* Signal the startup process that new WAL has arrived */

13
src/backend/replication/walreceiverfuncs.c
View File

@ -199,8 +199,17 @@ RequestXLogStreaming(XLogRecPtr recptr, const char *conninfo)
walrcv->walRcvState = WALRCV_STARTING;
walrcv->startTime = now;
walrcv->receivedUpto = recptr;
walrcv->latestChunkStart = recptr;
/*
* If this is the first startup of walreceiver, we initialize
* receivedUpto and latestChunkStart to receiveStart.
*/
if (walrcv->receiveStart.xlogid == 0 &&
walrcv->receiveStart.xrecoff == 0)
{
walrcv->receivedUpto = recptr;
walrcv->latestChunkStart = recptr;
}
walrcv->receiveStart = recptr;
SpinLockRelease(&walrcv->mutex);