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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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6
server/modules/monitor/mariadbmon/mariadbmon.hh
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@ -187,19 +187,19 @@ private:
bool standalone_master_required();
bool set_standalone_master();
void assign_relay_master(MariaDBServer& serv_info);
void log_master_changes(MariaDBServer* root_master);
void log_master_changes();
void update_gtid_domain();
void update_external_master();
void set_master_heartbeat(MariaDBServer*);
void set_slave_heartbeat(MariaDBServer*);
void measure_replication_lag(MariaDBServer* root_master);
void measure_replication_lag();
void check_maxscale_schema_replication();
MXS_MONITORED_SERVER* getServerByNodeId(long);
MXS_MONITORED_SERVER* getSlaveOfNodeId(long, slave_down_setting_t);
void build_replication_graph();
void tarjan_scc_visit_node(MariaDBServer *node, ServerArray* stack, int *index, int *cycle);
void assign_cycle_roles(int cycle);
MariaDBServer* find_topology_master_server();
MariaDBServer* find_topology_master_server(std::string* msg_out);
MariaDBServer* find_best_reach_server(const ServerArray& candidates);
void calculate_node_reach(MariaDBServer* node);
int calc_reach_visit_node(MariaDBServer* node);