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Remove wal_sender_delay GUC, because it's no longer useful.

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The latch infrastructure is now capable of detecting all cases where the
walsender loop needs to wake up, so there is no reason to have an arbitrary
timeout.

Also, modify the walsender loop logic to follow the standard pattern of
ResetLatch, test for work to do, WaitLatch.  The previous coding was both
hard to follow and buggy: it would sometimes busy-loop despite having
nothing available to do, eg between receipt of a signal and the next time
it was caught up with new WAL, and it also had interesting choices like
deciding to update to WALSNDSTATE_STREAMING on the strength of information
known to be obsolete.
This commit is contained in:
Tom Lane
2011-08-10 18:50:28 -04:00
parent 79b2ee20c8
commit cff75130b5
5 changed files with 74 additions and 108 deletions
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src/include/replication/walsender.h
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@@ -98,7 +98,6 @@ extern volatile sig_atomic_t walsender_shutdown_requested;
extern volatile sig_atomic_t walsender_ready_to_stop;
/* user-settable parameters */
extern int WalSndDelay;
extern int max_wal_senders;
extern int replication_timeout;