github/repmgr
1
0
Fork 0
mirror of https://github.com/EnterpriseDB/repmgr.git synced 2026-03-22 22:56:29 +00:00
Code Issues Packages Projects Releases 1 Wiki Activity

Make code to check standby join status available globally

Browse Source 
This makes it possible to check the standby join status from another
node, e.g. the promotion candidate during a switchover operation.
This commit is contained in:
Ian Barwick
2020-02-04 12:49:37 +09:00
parent e2a362a171
commit 7ed0a99d70
3 changed files with 136 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files

92
repmgr-client.c
View File

@@ -3866,6 +3866,98 @@ check_replication_slots_available(int node_id, PGconn* conn)
}
/*
* Check whether the specified standby has joined to its upstream.
*
* This is used by "standby switchover" and "node rejoin" to check
* the success of a node rejoin operation.
*
* IMPORTANT: the timeout settings will be taken from the node where the check
* is performed, which might not be the standby itself.
*/
standy_join_status
check_standby_join(PGconn *upstream_conn, t_node_info *upstream_node_record, t_node_info *standby_node_record)
{
int i;
bool available = false;
for (i = 0; i < config_file_options.standby_reconnect_timeout; i++)
{
if (is_server_available(config_file_options.conninfo))
{
log_verbose(LOG_INFO, _("node \"%s\" (ID: %i) is pingable"),
standby_node_record->node_name,
standby_node_record->node_id);
available = true;
break;
}
if (i % 5 == 0)
{
log_verbose(LOG_INFO, _("waiting for node \"%s\" (ID: %i) to respond to pings; %i of max %i attempts (parameter \"node_rejoin_timeout\")"),
standby_node_record->node_name,
standby_node_record->node_id,
i + 1,
config_file_options.node_rejoin_timeout);
}
else
{
log_debug("sleeping 1 second waiting for node \"%s\" (ID: %i) to respond to pings; %i of max %i attempts",
standby_node_record->node_name,
standby_node_record->node_id,
i + 1,
config_file_options.node_rejoin_timeout);
}
sleep(1);
}
/* node did not become available */
if (available == false)
{
return JOIN_FAIL_NO_PING;
}
for (; i < config_file_options.node_rejoin_timeout; i++)
{
NodeAttached node_attached = is_downstream_node_attached(upstream_conn,
standby_node_record->node_name);
if (node_attached == NODE_ATTACHED)
{
log_verbose(LOG_INFO, _("node \"%s\" (ID: %i) has attached to its upstream node"),
standby_node_record->node_name,
standby_node_record->node_id);
return JOIN_SUCCESS;
}
if (i % 5 == 0)
{
log_info(_("waiting for node \"%s\" (ID: %i) to connect to new primary; %i of max %i attempts (parameter \"node_rejoin_timeout\")"),
standby_node_record->node_name,
standby_node_record->node_id,
i + 1,
config_file_options.node_rejoin_timeout);
log_detail(_("checking for record in node \"%s\"'s \"pg_stat_replication\" table where \"application_name\" is \"%s\""),
upstream_node_record->node_name,
standby_node_record->node_name);
}
else
{
log_debug("sleeping 1 second waiting for node \"%s\" (ID: %i) to connect to new primary; %i of max %i attempts",
standby_node_record->node_name,
standby_node_record->node_id,
i + 1,
config_file_options.node_rejoin_timeout);
}
sleep(1);
}
return JOIN_FAIL_NO_REPLICATION;
}
/*
* Here we'll perform some timeline sanity checks to ensure the follow target
* can actually be followed.