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Check replication lag before attempting switchover

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This commit is contained in:
Ian Barwick
2017-08-08 10:16:47 +09:00
parent fd5dfa2ebc
commit f2cf46bba3
12 changed files with 605 additions and 48 deletions
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56
dbutils.c
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@@ -1309,7 +1309,7 @@ get_ready_archive_files(PGconn *conn, const char *data_directory)
if (server_version_num == UNKNOWN_SERVER_VERSION_NUM)
server_version_num = get_server_version(conn, NULL);
if (server_version_num >= 1000000)
if (server_version_num >= 100000)
{
snprintf(archive_status_dir, MAXPGPATH,
"%s/pg_wal/archive_status",
@@ -1376,6 +1376,60 @@ get_ready_archive_files(PGconn *conn, const char *data_directory)
}
int
get_replication_lag_seconds(PGconn *conn)
{
PQExpBufferData query;
PGresult *res;
int lag_seconds = 0;
if (server_version_num == UNKNOWN_SERVER_VERSION_NUM)
server_version_num = get_server_version(conn, NULL);
initPQExpBuffer(&query);
if (server_version_num >= 100000)
{
appendPQExpBuffer(
&query,
" SELECT CASE WHEN (pg_catalog.pg_last_wal_receive_lsn() = pg_catalog.pg_last_wal_replay_lsn()) ");
}
else
{
appendPQExpBuffer(
&query,
" SELECT CASE WHEN (pg_catalog.pg_last_xlog_receive_location() = pg_catalog.pg_last_xlog_replay_location()) ");
}
appendPQExpBuffer(
&query,
" THEN 0 "
" ELSE EXTRACT(epoch FROM (clock_timestamp() - pg_catalog.pg_last_xact_replay_timestamp()))::INT "
" END "
" AS lag_seconds");
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
log_verbose(LOG_DEBUG, "get_node_record():\n%s", query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK || !PQntuples(res))
{
log_warning("%s", PQerrorMessage(conn));
PQclear(res);
/* XXX magic number */
return -1;
}
lag_seconds = atoi(PQgetvalue(res, 0, 0));
PQclear(res);
return lag_seconds;
}
/* ================ */
/* result functions */
/* ================ */