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MXS-1446: Move failover parameters into mysqlmon

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The `failover` and `failover_timeout` parameters are now declared as a
part of the mysqlmon module. Changed the implementation of the failover
function so that the dependencies on the monitor struct can be removed or
moved into parameters.
This commit is contained in:
Markus Mäkelä
2017-09-28 08:15:28 +03:00
parent ef115208e6
commit d4fd34cecd
7 changed files with 44 additions and 120 deletions
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26
server/modules/monitor/mysqlmon/mysql_mon.c
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@ -60,6 +60,12 @@ void check_maxscale_schema_replication(MXS_MONITOR *monitor);
static bool report_version_err = true;
static const char* hb_table_name = "maxscale_schema.replication_heartbeat";
static const char CN_FAILOVER[] = "failover";
static const char CN_FAILOVER_TIMEOUT[] = "failover_timeout";
/** Default failover timeout */
#define DEFAULT_FAILOVER_TIMEOUT "90"
/**
* The module entry point routine. It is this routine that
* must populate the structure that is referred to as the
@ -116,6 +122,8 @@ MXS_MODULE* MXS_CREATE_MODULE()
MXS_MODULE_OPT_NONE,
mxs_monitor_event_enum_values
},
{CN_FAILOVER, MXS_MODULE_PARAM_BOOL, "false"},
{CN_FAILOVER_TIMEOUT, MXS_MODULE_PARAM_COUNT, DEFAULT_FAILOVER_TIMEOUT},
{MXS_END_MODULE_PARAMS}
}
};
@ -262,6 +270,8 @@ startMonitor(MXS_MONITOR *monitor, const MXS_CONFIG_PARAMETER* params)
handle->script = config_copy_string(params, "script");
handle->events = config_get_enum(params, "events", mxs_monitor_event_enum_values);
handle->allow_external_slaves = config_get_bool(params, "allow_external_slaves");
handle->failover = config_get_bool(params, CN_FAILOVER);
handle->failover_timeout = config_get_integer(params, CN_FAILOVER_TIMEOUT);
bool error = false;
@ -319,6 +329,8 @@ static void diagnostics(DCB *dcb, const MXS_MONITOR *mon)
{
const MYSQL_MONITOR *handle = (const MYSQL_MONITOR *)mon->handle;
dcb_printf(dcb, "Failover:\t%s\n", handle->failover ? "Enabled" : "Disabled");
dcb_printf(dcb, "Failover Timeout:\t%u\n", handle->failover_timeout);
dcb_printf(dcb, "MaxScale MonitorId:\t%lu\n", handle->id);
dcb_printf(dcb, "Replication lag:\t%s\n", (handle->replicationHeartbeat == 1) ? "enabled" : "disabled");
dcb_printf(dcb, "Detect Stale Master:\t%s\n", (handle->detectStaleMaster == 1) ? "enabled" : "disabled");
@ -365,6 +377,8 @@ static json_t* diagnostics_json(const MXS_MONITOR *mon)
json_object_set_new(rval, "failcount", json_integer(handle->failcount));
json_object_set_new(rval, "allow_cluster_recovery", json_boolean(handle->allow_cluster_recovery));
json_object_set_new(rval, "mysql51_replication", json_boolean(handle->mysql51_replication));
json_object_set_new(rval, CN_FAILOVER, json_boolean(handle->failover));
json_object_set_new(rval, CN_FAILOVER_TIMEOUT, json_integer(handle->failover_timeout));
if (handle->script)
{
@ -1401,7 +1415,17 @@ monitorMain(void *arg)
* need to be launched.
*/
mon_process_state_changes(mon, handle->script, handle->events);
mon_process_failover(mon);
if (handle->failover)
{
if (!mon_process_failover(mon, handle->failover_timeout))
{
MXS_ALERT("Failed to perform failover, disabling failover functionality. "
"To enable failover functionality, manually set 'failover' to "
"'true' for monitor '%s' via MaxAdmin or the REST API.", mon->name);
handle->failover = false;
}
}
/* log master detection failure of first master becomes available after failure */
if (root_master &&