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repmgrd: finalize witness failover handling

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This commit is contained in:
Ian Barwick
2017-11-15 11:34:17 +09:00
parent 347e753c27
commit 5e9d50f8ca
1 changed files with 117 additions and 3 deletions
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120
repmgrd-physical.c
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@@ -867,8 +867,8 @@ monitor_streaming_standby(void)
follow_new_primary(follow_node_id);
}
}
clear_node_info_list(&standby_nodes);
}
}
}
@@ -1183,7 +1183,93 @@ monitor_streaming_witness(void)
if (monitoring_state == MS_DEGRADED)
{
// XXX
int degraded_monitoring_elapsed = calculate_elapsed(degraded_monitoring_start);
log_debug("monitoring node %i in degraded state for %i seconds",
upstream_node_info.node_id,
degraded_monitoring_elapsed);
if (is_server_available(upstream_node_info.conninfo) == true)
{
primary_conn = establish_db_connection(upstream_node_info.conninfo, false);
if (PQstatus(primary_conn) == CONNECTION_OK)
{
upstream_node_info.node_status = NODE_STATUS_UP;
monitoring_state = MS_NORMAL;
initPQExpBuffer(&event_details);
appendPQExpBuffer(&event_details,
_("reconnected to upstream node %i after %i seconds, resuming monitoring"),
upstream_node_info.node_id,
degraded_monitoring_elapsed);
create_event_notification(primary_conn,
&config_file_options,
config_file_options.node_id,
"repmgrd_upstream_reconnect",
true,
event_details.data);
log_notice("%s", event_details.data);
termPQExpBuffer(&event_details);
goto loop;
}
}
else
{
/*
* unable to connect to former primary - check if another node
* has been promoted
*/
NodeInfoListCell *cell;
int follow_node_id = UNKNOWN_NODE_ID;
get_active_sibling_node_records(local_conn,
local_node_info.node_id,
local_node_info.upstream_node_id,
&standby_nodes);
if (standby_nodes.node_count > 0)
{
log_debug("scanning %i node records to detect new primary...", standby_nodes.node_count);
for (cell = standby_nodes.head; cell; cell = cell->next)
{
/* skip local node check, we did that above */
if (cell->node_info->node_id == local_node_info.node_id)
{
continue;
}
cell->node_info->conn = establish_db_connection(cell->node_info->conninfo, false);
if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
{
log_debug("unable to connect to %i ... ", cell->node_info->node_id);
continue;
}
if (get_recovery_type(cell->node_info->conn) == RECTYPE_PRIMARY)
{
follow_node_id = cell->node_info->node_id;
PQfinish(cell->node_info->conn);
cell->node_info->conn = NULL;
break;
}
PQfinish(cell->node_info->conn);
cell->node_info->conn = NULL;
}
if (follow_node_id != UNKNOWN_NODE_ID)
{
witness_follow_new_primary(follow_node_id);
}
}
clear_node_info_list(&standby_nodes);
}
}
loop:
@@ -1229,6 +1315,31 @@ loop:
}
}
if (got_SIGHUP)
{
log_debug("SIGHUP received");
if (reload_config(&config_file_options))
{
PQfinish(local_conn);
local_conn = establish_db_connection(config_file_options.conninfo, true);
if (*config_file_options.log_file)
{
FILE *fd;
fd = freopen(config_file_options.log_file, "a", stderr);
if (fd == NULL)
{
fprintf(stderr, "error reopening stderr to \"%s\": %s",
config_file_options.log_file, strerror(errno));
}
}
}
got_SIGHUP = false;
}
sleep(config_file_options.monitor_interval_secs);
}
#endif
@@ -2491,8 +2602,8 @@ bool do_witness_failover(void)
failover_state = FAILOVER_STATE_NONE;
return true;
case FAILOVER_STATE_FOLLOW_FAIL:
case FAILOVER_STATE_FOLLOW_FAIL:
/*
* for whatever reason we were unable to follow the new primary -
* continue monitoring in degraded state
@@ -2503,6 +2614,9 @@ bool do_witness_failover(void)
return false;
default:
monitoring_state = MS_DEGRADED;
INSTR_TIME_SET_CURRENT(degraded_monitoring_start);
return false;
}
/* should never reach here */