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Add "repmgr standby follow --upstream-node-id"

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In an automatic failover situation, after a standby has been promoted
there's a risk the original primary may become available again before
"standby follow" is issued on another standby node, in which case "standby
follow" will reconnect to the original primary.

As the standby's repmgrd will have received a notification from the new
primary, it will know the primary's ID and can therefore explicitly
direct "standby follow" to follow that primary.
This commit is contained in:
Ian Barwick
2017-09-04 09:11:59 +09:00
parent 3aeceab081
commit 47a4b49890
3 changed files with 61 additions and 18 deletions
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70
repmgr-action-standby.c
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@@ -1408,6 +1408,7 @@ do_standby_follow(void)
PGconn *primary_conn = NULL;
int primary_id = UNKNOWN_NODE_ID;
t_node_info primary_node_record = T_NODE_INFO_INITIALIZER;
RecordStatus record_status = RECORD_NOT_FOUND;
int timer = 0;
@@ -1428,24 +1429,52 @@ do_standby_follow(void)
/* check this is a standby */
check_recovery_type(local_conn);
/*
* Attempt to connect to primary.
*
* If --wait provided, loop for up `primary_follow_timeout`
* seconds before giving up
*/
for (timer = 0; timer < config_file_options.primary_follow_timeout; timer++)
if (runtime_options.upstream_node_id != NO_UPSTREAM_NODE)
{
primary_conn = get_primary_connection_quiet(local_conn,
&primary_id,
NULL);
// XXX check not self!
if (PQstatus(primary_conn) == CONNECTION_OK || runtime_options.wait == false)
record_status = get_node_record(local_conn, runtime_options.upstream_node_id, &primary_node_record);
if (record_status != RECORD_FOUND)
{
break;
log_error(_("unable to find record for specified upstream node %i"),
runtime_options.upstream_node_id);
PQfinish(local_conn);
exit(ERR_BAD_CONFIG);
}
for (timer = 0; timer < config_file_options.primary_follow_timeout; timer++)
{
primary_conn = establish_db_connection(config_file_options.conninfo, true);
if (PQstatus(primary_conn) == CONNECTION_OK || runtime_options.wait == false)
{
primary_id = runtime_options.upstream_node_id;
break;
}
sleep(1);
}
}
else
{
/*
* Attempt to connect to primary.
*
* If --wait provided, loop for up `primary_follow_timeout`
* seconds before giving up
*/
for (timer = 0; timer < config_file_options.primary_follow_timeout; timer++)
{
primary_conn = get_primary_connection_quiet(local_conn,
&primary_id,
NULL);
if (PQstatus(primary_conn) == CONNECTION_OK || runtime_options.wait == false)
{
break;
}
sleep(1);
}
sleep(1);
}
PQfinish(local_conn);
@@ -1457,10 +1486,19 @@ do_standby_follow(void)
exit(ERR_BAD_CONFIG);
}
get_node_record(primary_conn, primary_id, &primary_node_record);
record_status = get_node_record(primary_conn, primary_id, &primary_node_record);
if (record_status != RECORD_FOUND)
{
log_error(_("unable to find record for new upstream node %i"),
runtime_options.upstream_node_id);
PQfinish(primary_conn);
exit(ERR_BAD_CONFIG);
}
// XXX check this is not current upstream anyway
/* check replication connection */
initialize_conninfo_params(&repl_conninfo, false);
conn_to_param_list(primary_conn, &repl_conninfo);