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repmgrd: optionally disconnect WAL receivers during failover

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This is intended to ensure that all nodes have a constant LSN while
making the failover decision.

This feature is experimental and needs to be explicitly enabled with the
configuration file option "standby_disconnect_on_failover".

Note enabling this option will result in a delay in the failover decision
until the WAL receiver is disconnected on all nodes.
This commit is contained in:
Ian Barwick
2019-03-01 18:20:44 +09:00
committed by Ian Barwick
parent dd04ebb809
commit 1615353f48
16 changed files with 404 additions and 17 deletions
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16
repmgr.c
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@@ -147,6 +147,8 @@ PG_FUNCTION_INFO_V1(repmgrd_pause);
Datum repmgrd_is_paused(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(repmgrd_is_paused);
Datum get_wal_receiver_pid(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(get_wal_receiver_pid);
/*
@@ -740,3 +742,17 @@ repmgrd_is_paused(PG_FUNCTION_ARGS)
PG_RETURN_BOOL(is_paused);
}
Datum
get_wal_receiver_pid(PG_FUNCTION_ARGS)
{
int wal_receiver_pid;
if (!shared_state)
PG_RETURN_NULL();
wal_receiver_pid = WalRcv->pid;
PG_RETURN_INT32(wal_receiver_pid);
}