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MXS-1845 Only rebuild topology when required

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The monitor now detects when a server has changed such that a replication
graph rebuild is needed and only then rebuilds the graph and detects
cycles and master.

Also, some old code is no longer called in the monitor cycle. It will be
removed in later commits. Refactored some of the related functions.
This commit is contained in:
Esa Korhonen
2018-06-20 15:26:27 +03:00
parent dc4a555c70
commit 6bf10904d7
5 changed files with 224 additions and 162 deletions
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9
server/modules/monitor/mariadbmon/mariadbserver.hh
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@ -132,7 +132,7 @@ public:
* 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 */
@ -144,9 +144,13 @@ public:
* new non-replicated events. */
GtidList m_gtid_current_pos; /**< Gtid of latest event. */
GtidList m_gtid_binlog_pos; /**< Gtid of latest event written to binlog. */
bool m_topology_changed; /**< Has anything that could affect replication topology changed
* this iteration? Causes: server id, slave connections,
* read-only. */
NodeData m_node; /**< Replication topology data */
SlaveStatusArray m_slave_status; /**< Data returned from SHOW SLAVE STATUS */
ReplicationSettings m_rpl_settings; /**< Miscellaneous replication related settings */
NodeData m_node; /**< Replication topology data */
bool m_print_update_errormsg;/**< Should an update error be printed. */
MariaDBServer(MXS_MONITORED_SERVER* monitored_server, int config_index);
@ -388,6 +392,7 @@ public:
private:
bool update_slave_status(std::string* errmsg_out = NULL);
static bool sstatus_arrays_topology_equal(const SlaveStatusArray& lhs, const SlaveStatusArray& rhs);
};
/**