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fixing repmgr repl_status columns

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repmgr repl_status had the column time_lag which was documented to be
the time a standby is behind master. In fact it only works like this
when viewed on the standby and not on the master: there it only was the
time of the last status update. We dropped that column and replaced it
by a new column „communication_time_lag“ which is the content of the
repl_status column on the master. On the standby we contain the time of
the last update in shared mem though refer always to the correct time
nonetheless where repl_status is queried. We also added a new column,
„replication_time_lag“, which refers to the apply delay.
This commit is contained in:
Christian Kruse
2014-02-15 01:35:27 +01:00
parent 18f1fed77f
commit c3b58658ad
5 changed files with 99 additions and 5 deletions
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7
repmgrd.c
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@@ -530,6 +530,7 @@ StandbyMonitor(void)
char last_wal_primary_location[MAXLEN];
char last_wal_standby_received[MAXLEN];
char last_wal_standby_applied[MAXLEN];
char last_wal_standby_applied_timestamp[MAXLEN];
unsigned long long int lsn_primary;
unsigned long long int lsn_standby_received;
@@ -637,7 +638,7 @@ StandbyMonitor(void)
sqlquery_snprintf(
sqlquery,
"SELECT CURRENT_TIMESTAMP, pg_last_xlog_receive_location(), "
"pg_last_xlog_replay_location()");
"pg_last_xlog_replay_location(), pg_last_xact_replay_timestamp()");
res = PQexec(myLocalConn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
@@ -651,6 +652,7 @@ StandbyMonitor(void)
strncpy(monitor_standby_timestamp, PQgetvalue(res, 0, 0), MAXLEN);
strncpy(last_wal_standby_received , PQgetvalue(res, 0, 1), MAXLEN);
strncpy(last_wal_standby_applied , PQgetvalue(res, 0, 2), MAXLEN);
strncpy(last_wal_standby_applied_timestamp, PQgetvalue(res, 0, 3), MAXLEN);
PQclear(res);
/* Get primary xlog info */
@@ -678,9 +680,10 @@ StandbyMonitor(void)
sqlquery_snprintf(sqlquery,
"INSERT INTO %s.repl_monitor "
"VALUES(%d, %d, '%s'::timestamp with time zone, "
" '%s', '%s', "
" '%s'::timestamp with time zone, '%s', '%s', "
" %lld, %lld)", repmgr_schema,
primary_options.node, local_options.node, monitor_standby_timestamp,
last_wal_standby_applied_timestamp,
last_wal_primary_location,
last_wal_standby_received,
(lsn_primary - lsn_standby_received),