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repmgrd: improve primary visibility consensus check

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Exclude sibling nodes which report they're following a different
node. This shouldn't happen, but could.
This commit is contained in:
Ian Barwick
2019-04-04 16:03:55 +09:00
parent 008bd00a59
commit cd6a55c7cb
4 changed files with 32 additions and 16 deletions
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15
dbutils.c
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@@ -4993,7 +4993,8 @@ get_replication_info(PGconn *conn, t_server_type node_type, ReplInfo *replicatio
" END AS replication_lag_time, "
" last_wal_receive_lsn >= last_wal_replay_lsn AS receiving_streamed_wal, "
" wal_replay_paused, "
" upstream_last_seen "
" upstream_last_seen, "
" upstream_node_id "
" FROM ( "
" SELECT CURRENT_TIMESTAMP AS ts, "
" pg_catalog.pg_is_in_recovery() AS in_recovery, "
@@ -5033,10 +5034,12 @@ get_replication_info(PGconn *conn, t_server_type node_type, ReplInfo *replicatio
" END AS wal_replay_paused, ");
}
/* Add information about upstream node from shared memory */
if (node_type == WITNESS)
{
appendPQExpBufferStr(&query,
" repmgr.get_upstream_last_seen() AS upstream_last_seen");
" repmgr.get_upstream_last_seen() AS upstream_last_seen, "
" repmgr.get_upstream_node_id() AS upstream_node_id ");
}
else
{
@@ -5044,7 +5047,12 @@ get_replication_info(PGconn *conn, t_server_type node_type, ReplInfo *replicatio
" CASE WHEN pg_catalog.pg_is_in_recovery() IS FALSE "
" THEN -1 "
" ELSE repmgr.get_upstream_last_seen() "
" END AS upstream_last_seen ");
" END AS upstream_last_seen, ");
appendPQExpBufferStr(&query,
" CASE WHEN pg_catalog.pg_is_in_recovery() IS FALSE "
" THEN -1 "
" ELSE repmgr.get_upstream_node_id() "
" END AS upstream_node_id ");
}
appendPQExpBufferStr(&query,
@@ -5075,6 +5083,7 @@ get_replication_info(PGconn *conn, t_server_type node_type, ReplInfo *replicatio
replication_info->receiving_streamed_wal = atobool(PQgetvalue(res, 0, 6));
replication_info->wal_replay_paused = atobool(PQgetvalue(res, 0, 7));
replication_info->upstream_last_seen = atoi(PQgetvalue(res, 0, 8));
replication_info->upstream_node_id = atoi(PQgetvalue(res, 0, 9));
}
termPQExpBuffer(&query);