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repmgrd: in BDR mode, have each repmgrd monitor each node

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This will cover both the case when an entire node including
repmgrd goes down, and when one PostgreSQL instance goes down
but repmgrd is still up (in which case only one of the repmgrds
will handle the failover).
This commit is contained in:
Ian Barwick
2017-07-14 15:01:18 +09:00
parent e3b3fb65f0
commit 951c7dbd07
9 changed files with 211 additions and 89 deletions
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39
dbutils.c
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@@ -16,7 +16,7 @@
/* mainly for use by repmgrd */
int server_version_num = 0;
int server_version_num = UNKNOWN_SERVER_VERSION_NUM;
static PGconn *_establish_db_connection(const char *conninfo,
@@ -1247,6 +1247,7 @@ _populate_node_record(PGresult *res, t_node_info *node_info, int row)
node_info->is_ready = false;
node_info->is_visible = false;
node_info->last_wal_receive_lsn = InvalidXLogRecPtr;
node_info->monitoring_state = MS_NORMAL;
}
@@ -3135,7 +3136,7 @@ void _populate_bdr_node_records(PGresult *res, BdrNodeInfoList *node_list)
{
int i;
clear_node_info_list(node_list);
clear_node_info_list((NodeInfoList *)node_list);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
@@ -3180,3 +3181,37 @@ _populate_bdr_node_record(PGresult *res, t_bdr_node_info *node_info, int row)
}
bool
am_bdr_failover_handler(PGconn *conn, int node_id)
{
PQExpBufferData query;
PGresult *res;
bool am_handler;
initPQExpBuffer(&query);
appendPQExpBuffer(
&query,
"SELECT repmgr.am_bdr_failover_handler(%i)",
node_id);
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
am_handler = (strcmp(PQgetvalue(res, 0, 0), "t") == 0) ? true : false;
PQclear(res);
return am_handler;
}
void
unset_bdr_failover_handler(PGconn *conn)
{
PGresult *res;
res = PQexec(conn, "SELECT repmgr.unset_bdr_failover_handler()");
PQclear(res);
return;
}