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Use a latch to make startup process wake up and replay immediately when

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new WAL arrives via streaming replication. This reduces the latency, and
also allows us to use a longer polling interval, which is good for energy
efficiency.

We still need to poll to check for the appearance of a trigger file, but
the interval is now 5 seconds (instead of 100ms), like when waiting for
a new WAL segment to appear in WAL archive.
This commit is contained in:
Heikki Linnakangas
2010-09-15 10:35:05 +00:00
parent 236b6bc29e
commit 723d0184e2
3 changed files with 53 additions and 8 deletions
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5
src/backend/replication/walreceiver.c
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@@ -29,7 +29,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.16 2010/07/06 19:18:57 momjian Exp $
* $PostgreSQL: pgsql/src/backend/replication/walreceiver.c,v 1.17 2010/09/15 10:35:05 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -529,6 +529,9 @@ XLogWalRcvFlush(void)
walrcv->receivedUpto = LogstreamResult.Flush;
SpinLockRelease(&walrcv->mutex);
/* Signal the startup process that new WAL has arrived */
WakeupRecovery();
/* Report XLOG streaming progress in PS display */
if (update_process_title)
{