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have new primary communicate to standbys

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This commit is contained in:
Ian Barwick
2017-06-30 21:45:25 +09:00
parent 1857e23fef
commit debe5a18c5
5 changed files with 178 additions and 9 deletions
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72
repmgrd.c
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@@ -28,7 +28,8 @@ typedef enum {
FAILOVER_STATE_PROMOTED,
FAILOVER_STATE_PROMOTION_FAILED,
FAILOVER_STATE_PRIMARY_REAPPEARED,
FAILOVER_STATE_LOCAL_NODE_FAILURE
FAILOVER_STATE_LOCAL_NODE_FAILURE,
FAILOVER_STATE_WAITING_NEW_PRIMARY
// FOLLOWED_NEW_PRIMARY
// FOLLOW_WAIT_TIMEOUT
} FailoverState;
@@ -90,6 +91,8 @@ static const char *_print_voting_status(NodeVotingStatus voting_status);
static const char *_print_election_result(ElectionResult result);
static FailoverState promote_self(void);
static void wait_primary_notification(void);
static void notify_followers(NodeInfoList *standby_nodes);
static void close_connections();
static void terminate(int retval);
@@ -579,14 +582,27 @@ monitor_streaming_standby(void)
// --> need timeout in case new primary doesn't come up, then rerun election
log_info("I am a follower and am waiting to be informed by the winner");
failover_state = FAILOVER_STATE_WAITING_NEW_PRIMARY;
}
switch(failover_state)
{
case FAILOVER_STATE_PROMOTED:
// inform nodes
// pass control back down and start primary monitoring
break;
/* inform former siblings that we are Number 1 */
notify_followers(&standby_nodes);
/* we no longer care about our former siblings */
clear_node_info_list(&standby_nodes);
/* pass control back down to start_monitoring() */
log_info(_("switching to primary monitoring mode"));
return;
case FAILOVER_STATE_WAITING_NEW_PRIMARY:
/* either follow or time out; either way resume monitoring */
wait_primary_notification();
/* pass control back down to start_monitoring() */
return;
case FAILOVER_STATE_PROMOTION_FAILED:
case FAILOVER_STATE_PRIMARY_REAPPEARED:
case FAILOVER_STATE_LOCAL_NODE_FAILURE:
@@ -644,7 +660,7 @@ promote_self(void)
// XXX handle this
return FAILOVER_STATE_LOCAL_NODE_FAILURE;
}
}
}
if (r != 0)
{
@@ -701,6 +717,52 @@ promote_self(void)
return FAILOVER_STATE_PROMOTED;
}
static void
wait_primary_notification(void)
{
// XXX make this configurable
int wait_primary_timeout = 60;
int i;
int new_primary_id;
for (i = 0; i < wait_primary_timeout; i++)
{
if (get_new_primary(local_conn, &new_primary_id) == true)
{
log_debug("XXX new primary is %i", new_primary_id);
//return;
}
sleep(1);
}
}
static void
notify_followers(NodeInfoList *standby_nodes)
{
NodeInfoListCell *cell;
for (cell = standby_nodes->head; cell; cell = cell->next)
{
log_debug("intending to notify %i... ", cell->node_info->node_id);
if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
{
log_debug("connection to %i lost... ", cell->node_info->node_id);
cell->node_info->conn = establish_db_connection(cell->node_info->conninfo, false);
}
if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
{
log_debug("unable to reconnect to %i ... ", cell->node_info->node_id);
continue;
}
log_debug("notifying node %i to follow new primary", cell->node_info->node_id);
notify_follow_primary(cell->node_info->conn, local_node_info.node_id);
}
}
static const char *
_print_voting_status(NodeVotingStatus voting_status)