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repmgr node status: add information about current LSN locations for streaming standbys

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This commit is contained in:
Ian Barwick
2017-07-31 09:37:06 +09:00
committed by Ian Barwick
parent d00cb63179
commit 8a5665a421
3 changed files with 122 additions and 8 deletions
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62
dbutils.c
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@@ -1153,7 +1153,6 @@ get_primary_node_id(PGconn *conn)
log_verbose(LOG_DEBUG, "get_primary_node_id():\n%s", query.data);
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
@@ -1177,6 +1176,65 @@ get_primary_node_id(PGconn *conn)
}
bool
get_replication_info(PGconn *conn, ReplInfo *replication_info)
{
PQExpBufferData query;
PGresult *res;
initPQExpBuffer(&query);
appendPQExpBuffer(
&query,
" SELECT last_wal_receive_lsn, "
" last_wal_replay_lsn, "
" last_xact_replay_timestamp, "
" CASE WHEN (last_wal_receive_lsn = last_wal_replay_lsn) "
" THEN '0 seconds'::INTERVAL "
" ELSE "
" clock_timestamp() - last_xact_replay_timestamp "
" END AS replication_lag_time "
" FROM ( ");
if (server_version_num >= 100000)
{
appendPQExpBuffer(
&query,
" SELECT pg_last_wal_receive_lsn() AS last_wal_receive_lsn, "
" pg_last_wal_replay_lsn() AS last_wal_replay_lsn, "
" pg_last_xact_replay_timestamp() AS last_xact_replay_timestamp ");
}
else
{
appendPQExpBuffer(
&query,
" SELECT pg_last_xlog_receive_location() AS last_wal_receive_lsn, "
" pg_last_xlog_replay_location() AS last_wal_replay_lsn, "
" pg_last_xact_replay_timestamp() AS last_xact_replay_timestamp ");
}
appendPQExpBuffer(
&query,
" ) q ");
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK || !PQntuples(res))
{
log_error(_("unable to execute replication info query:\n %s"),
PQerrorMessage(conn));
PQclear(res);
return false;
}
replication_info->last_wal_receive_lsn = parse_lsn(PQgetvalue(res, 0, 0));
replication_info->last_wal_replay_lsn = parse_lsn(PQgetvalue(res, 0, 1));
strncpy(replication_info->replication_lag_time, PQgetvalue(res, 0, 3), MAXLEN);
return true;
}
/* ================ */
/* result functions */
@@ -1217,7 +1275,7 @@ get_repmgr_extension_status(PGconn *conn)
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to execute extension query:\n %s"),
log_error(_("unable to execute extension query:\n %s"),
PQerrorMessage(conn));
PQclear(res);