/* Promote a node */
static int pool_promote_node(int node_id, bool gracefully)
{
if (!gracefully)
{
promote_backend(node_id); /* send promote request */
return 0;
}
/*
* Wait until all frontends exit
*/
*InRecovery = RECOVERY_PROMOTE; /* This wiil ensure that new incoming
* connection requests are blocked */
if (wait_connection_closed())
{
/* wait timed out */
finish_recovery();
return -1;
}
/*
* Now all frontends have gone. Let's do failover.
*/
promote_backend(node_id); /* send promote request */
/*
* Wait for failover completed.
*/
pcp_worker_wakeup_request = 0;
while (!pcp_worker_wakeup_request)
{
struct timeval t = {1, 0};
select(0, NULL, NULL, NULL, &t);
}
pcp_worker_wakeup_request = 0;
/*
* Start to accept incoming connections and send SIGUSR2 to pgpool
* parent to distribute SIGUSR2 all pgpool children.
*/
finish_recovery();
return 0;
}
/* send node request signal */
static void
wd_node_request_signal(WD_PACKET_NO packet_no, WdNodeInfo *node)
{
switch (packet_no)
{
case WD_FAILBACK_REQUEST:
send_failback_request(node->node_id_set[0]);
break;
case WD_DEGENERATE_BACKEND:
degenerate_backend_set(node->node_id_set, node->node_num);
break;
case WD_PROMOTE_BACKEND:
promote_backend(node->node_id_set[0]);
break;
default:
pool_error("wd_node_request_signal: unknown packet number");
break;
}
}