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MXS-1845 Only select a master if current master is no longer usable

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The purpose is to make the selected master server sticky. The master is reselected only
if the current master is no longer a valid master.
This commit is contained in:
Esa Korhonen
2018-06-12 10:27:23 +03:00
parent 95935991ab
commit 2f987d0b10
6 changed files with 174 additions and 36 deletions
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6
server/modules/monitor/mariadbmon/mariadbserver.hh
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@ -131,10 +131,10 @@ public:
MXS_MONITORED_SERVER* m_server_base; /**< Monitored server base class/struct. MariaDBServer does not
* own the struct, it is not freed (or connection closed) when
* a MariaDBServer is destroyed. Can be const on gcc 4.8 */
int m_config_index; /**< What position this server has in the monitor config */
bool m_print_update_errormsg;/**< Should an update error be printed. */
version m_version; /**< Server version/type. */
int64_t m_server_id; /**< Value of @@server_id. Valid values are 32bit unsigned. */
bool m_read_only; /**< Value of @@read_only */
size_t m_n_slaves_running; /**< Number of running slave connections */
int m_n_slave_heartbeats; /**< Number of received heartbeats */
@ -146,9 +146,9 @@ public:
GtidList m_gtid_binlog_pos; /**< Gtid of latest event written to binlog. */
SlaveStatusArray m_slave_status; /**< Data returned from SHOW SLAVE STATUS */
ReplicationSettings m_rpl_settings; /**< Miscellaneous replication related settings */
NodeData m_node; /**< Replication topology data */
MariaDBServer(MXS_MONITORED_SERVER* monitored_server);
MariaDBServer(MXS_MONITORED_SERVER* monitored_server, int config_index);
void monitor_server();
void update_server_info();