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standby switchover: detect if demotion candidate is running as a primary

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This shouldn't happen, but if it does, log the fact for easier analysis.
This commit is contained in:
Ian Barwick
2021-07-28 11:50:57 +09:00
parent 5f1ba6db3d
commit 17987a2690
1 changed files with 21 additions and 0 deletions
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21
repmgr-action-standby.c
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@@ -5428,6 +5428,27 @@ do_standby_switchover(void)
remote_node_record.node_name, remote_node_record.node_name,
remote_node_record.node_id); remote_node_record.node_id);
/*
* Speculatively check if the demotion candidate has been restarted, e.g. by
* an external watchdog process which isn't aware a switchover is happening.
* This falls into the category "thing outside of our control which shouldn't
* happen, but if it does, make it easier to find out what happened".
*/
remote_conn = establish_db_connection(remote_node_record.conninfo, false);
if (PQstatus(remote_conn) == CONNECTION_OK)
{
if (get_recovery_type(remote_conn) == RECTYPE_PRIMARY)
{
appendPQExpBuffer(&detailmsg,
_("PostgreSQL instance on demotion candidate \"%s\" (ID: %i) is running as a primary\n"),
remote_node_record.node_name,
remote_node_record.node_id);
log_warning("%s", detailmsg.data);
}
}
PQfinish(remote_conn);
appendPQExpBuffer(&detailmsg, appendPQExpBuffer(&detailmsg,
"check log file \"%s\" on \"%s\" for details", "check log file \"%s\" on \"%s\" for details",
node_rejoin_log, node_rejoin_log,