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repmgrd: prevent invalid apply lag value being written to the monitoring table

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This commit is contained in:
Ian Barwick
2017-01-11 12:49:36 +09:00
parent c60d60a7b1
commit aaece9826e
2 changed files with 19 additions and 3 deletions
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18
repmgrd.c
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@@ -1187,10 +1187,22 @@ standby_monitor(void)
PQclear(res);
lsn_master_current_xlog_location = lsn_to_xlogrecptr(last_wal_primary_location, NULL);
lsn_last_xlog_replay_location = lsn_to_xlogrecptr(last_xlog_replay_location, NULL);
lsn_last_xlog_receive_location = lsn_to_xlogrecptr(last_xlog_receive_location, NULL);
lsn_last_xlog_replay_location = lsn_to_xlogrecptr(last_xlog_replay_location, NULL);
if (lsn_last_xlog_receive_location >= lsn_last_xlog_replay_location)
{
apply_lag = (long long unsigned int)lsn_last_xlog_receive_location - lsn_last_xlog_replay_location;
}
else
{
/* This should never happen, but in case it does set apply lag to zero */
log_warning("Standby receive (%s) location appears less than standby replay location (%s)\n",
last_xlog_receive_location,
last_xlog_replay_location);
apply_lag = 0;
}
apply_lag = (long long unsigned int)lsn_last_xlog_receive_location - lsn_last_xlog_replay_location;
/* Calculate replication lag */
if (lsn_master_current_xlog_location >= lsn_last_xlog_receive_location)
@@ -1199,7 +1211,7 @@ standby_monitor(void)
}
else
{
/* This should never happen, but in case it does set lag to zero */
/* This should never happen, but in case it does set replication lag to zero */
log_warning("Master xlog (%s) location appears less than standby receive location (%s)\n",
last_wal_primary_location,
last_xlog_receive_location);