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MXS-1845 Find strongly connected components with multiple slave connections

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Rewrote the algorithm for clarity.
This commit is contained in:
Esa Korhonen
2018-05-22 14:17:39 +03:00
parent 32c7ae2f9f
commit 4d7aff4ab9
5 changed files with 201 additions and 143 deletions
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10
server/modules/monitor/mariadbmon/mariadbmon.hh
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@ -30,8 +30,8 @@ class MariaDBMonitor;
// Map of base struct to MariaDBServer. Does not own the server objects. May not be needed at the end.
typedef std::tr1::unordered_map<MXS_MONITORED_SERVER*, MariaDBServer*> ServerInfoMap;
// Server pointer array
typedef std::vector<MariaDBServer*> ServerArray;
// Map of server id:s to MariaDBServer. Useful when constructing the replication graph.
typedef std::tr1::unordered_map<int64_t, MariaDBServer*> IdToServerMap;
// MariaDB Monitor instance data
class MariaDBMonitor : public maxscale::MonitorInstance
@ -105,6 +105,7 @@ private:
// Values updated by monitor
MariaDBServer* m_master; /**< Master server for Master/Slave replication */
IdToServerMap m_servers_by_id; /**< Map from server id:s to MariaDBServer */
int64_t m_master_gtid_domain; /**< gtid_domain_id most recently seen on the master */
std::string m_external_master_host; /**< External master host, for fail/switchover */
int m_external_master_port; /**< External master port */
@ -154,6 +155,7 @@ private:
bool configure(const MXS_CONFIG_PARAMETER* params);
bool set_replication_credentials(const MXS_CONFIG_PARAMETER* params);
MariaDBServer* get_server_info(MXS_MONITORED_SERVER* db);
MariaDBServer* get_server(int64_t id);
// Cluster discovery and status assignment methods
MariaDBServer* find_root_master();
@ -173,6 +175,10 @@ private:
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_ssc_visit_node(MariaDBServer *node, ServerArray* stack, int *index,
int *cycle);
void assign_cycle_roles(int cycle);
// Switchover methods
bool switchover_check(SERVER* new_master, SERVER* current_master,