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MXS-1533: Fix relay master identification and root master detection

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Relay master servers must now have a running slave. Also, fix cluster master
detection in get_replication_tree().
This commit is contained in:
Esa Korhonen 2017-11-28 17:30:19 +02:00
parent 36129466e5
commit 4cb50f48ad
1 changed files with 16 additions and 10 deletions
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26
server/modules/monitor/mysqlmon/mysql_mon.cc
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@ -78,6 +78,12 @@ enum mysql_server_version
MYSQL_SERVER_VERSION_51
};
enum slave_down_setting_t
{
ACCEPT_DOWN,
REJECT_DOWN
};
static void monitorMain(void *);
static void *startMonitor(MXS_MONITOR *, const MXS_CONFIG_PARAMETER*);
static void stopMonitor(MXS_MONITOR *);
@ -85,7 +91,7 @@ static bool stop_monitor(MXS_MONITOR *);
static void diagnostics(DCB *, const MXS_MONITOR *);
static json_t* diagnostics_json(const MXS_MONITOR *);
static MXS_MONITORED_SERVER *getServerByNodeId(MXS_MONITORED_SERVER *, long);
static MXS_MONITORED_SERVER *getSlaveOfNodeId(MXS_MONITORED_SERVER *, long);
static MXS_MONITORED_SERVER *getSlaveOfNodeId(MXS_MONITORED_SERVER *, long, slave_down_setting_t);
static MXS_MONITORED_SERVER *get_replication_tree(MXS_MONITOR *, int);
static void set_master_heartbeat(MYSQL_MONITOR *, MXS_MONITORED_SERVER *);
static void set_slave_heartbeat(MXS_MONITOR *, MXS_MONITORED_SERVER *);
@ -1955,7 +1961,7 @@ monitorMain(void *arg)
ss_dassert(serv_info);
if (ptr->server->node_id > 0 && ptr->server->master_id > 0 &&
getSlaveOfNodeId(mon->monitored_servers, ptr->server->node_id) &&
getSlaveOfNodeId(mon->monitored_servers, ptr->server->node_id, REJECT_DOWN) &&
getServerByNodeId(mon->monitored_servers, ptr->server->master_id) &&
(!handle->multimaster || serv_info->group == 0))
{
@ -2204,18 +2210,19 @@ getServerByNodeId(MXS_MONITORED_SERVER *ptr, long node_id)
/**
* Fetch a MySQL slave node from a node_id
*
* @param ptr The list of servers to monitor
* @param node_id The MySQL server_id to fetch
* @return The slave server of this node_id
* @param ptr The list of servers to monitor
* @param node_id The MySQL server_id to fetch
* @param slave_down_setting Whether to accept or reject slaves which are down
* @return The slave server of this node_id
*/
static MXS_MONITORED_SERVER *
getSlaveOfNodeId(MXS_MONITORED_SERVER *ptr, long node_id)
getSlaveOfNodeId(MXS_MONITORED_SERVER *ptr, long node_id, slave_down_setting_t slave_down_setting)
{
SERVER *current;
while (ptr)
{
current = ptr->server;
if (current->master_id == node_id)
if (current->master_id == node_id && (slave_down_setting == ACCEPT_DOWN || !SERVER_IS_DOWN(current)))
{
return ptr;
}
@ -2510,7 +2517,7 @@ static MXS_MONITORED_SERVER *get_replication_tree(MXS_MONITOR *mon, int num_serv
if (node_id < 1)
{
MXS_MONITORED_SERVER *find_slave;
find_slave = getSlaveOfNodeId(mon->monitored_servers, current->node_id);
find_slave = getSlaveOfNodeId(mon->monitored_servers, current->node_id, ACCEPT_DOWN);
if (find_slave == NULL)
{
@ -2571,6 +2578,7 @@ static MXS_MONITORED_SERVER *get_replication_tree(MXS_MONITOR *mon, int num_serv
/** A master with a lower depth was found, remove
the master status from the previous master. */
monitor_clear_pending_status(handle->master, SERVER_MASTER);
handle->master = master;
}
MySqlServerInfo* info = get_server_info(handle, master);
@ -2580,8 +2588,6 @@ static MXS_MONITORED_SERVER *get_replication_tree(MXS_MONITOR *mon, int num_serv
/** Only set the Master status if read_only is disabled */
monitor_set_pending_status(master, info->read_only ? SERVER_SLAVE : SERVER_MASTER);
}
handle->master = master;
}
else
{