b34e0000b4
Autoselection is allowed for current master only, or both current and new master. Autoselection is not allowed for just the new master. Also, do_switchover() writes to its parameters when autoselecting for better error messages.
252 lines
11 KiB
C++
252 lines
11 KiB
C++
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <maxscale/cppdefs.hh>
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#include <string>
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#include <tr1/unordered_map>
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#include <vector>
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#include <maxscale/json_api.h>
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#include <maxscale/monitor.h>
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#include <maxscale/thread.h>
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#include "mariadbserver.hh"
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#include "utilities.hh"
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extern const int PORT_UNKNOWN;
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extern const char * const CN_AUTO_FAILOVER;
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class MariaDBMonitor;
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// Map of base struct to MariaDBServer. Does not own the server objects. May not be needed at the end.
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typedef std::tr1::unordered_map<MXS_MONITORED_SERVER*, MariaDBServer*> ServerInfoMap;
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// Server container, owns the server objects.
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typedef std::vector<MariaDBServer> ServerArray; // TODO: Rename/get rid of ServerVector typedef!
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// Server pointer array, used for temporary server collections
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typedef std::vector<MariaDBServer*> ServerRefArray;
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// MariaDB Monitor instance data
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class MariaDBMonitor
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{
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private:
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MariaDBMonitor(const MariaDBMonitor&);
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MariaDBMonitor& operator = (const MariaDBMonitor&);
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public:
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// TODO: Once done refactoring, see which of these can be moved to private.
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/**
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* Print diagnostics.
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*
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* @param dcb DCB to print to
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*/
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void diagnostics(DCB *dcb) const;
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/**
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* Print diagnostics to json object.
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*
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* @return Diagnostics messages
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*/
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json_t* diagnostics_json() const;
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/**
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* Runs the main monitor loop. Called from the static monitorMain()-function.
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*/
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void main_loop();
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/**
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* Start the monitor instance and return the instance data, creating it if starting for the first time.
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* This function creates a thread to execute the monitoring.
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*
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* @param monitor General monitor data
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* @param params Configuration parameters
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* @return A pointer to MariaDBMonitor specific data.
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*/
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static MariaDBMonitor* start(MXS_MONITOR *monitor, const MXS_CONFIG_PARAMETER* params);
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/**
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* Stop the monitor. Waits until monitor has stopped.
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*/
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bool stop();
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/**
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* Handle switchover
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*
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* @new_master The specified new master
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* @current_master The specified current master. If NULL, monitor will autoselect.
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* @output Pointer where to place output object
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*
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* @return True, if switchover was performed, false otherwise.
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*/
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bool manual_switchover(SERVER* new_master, SERVER* current_master, json_t** error_out);
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/**
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* Perform user-activated failover.
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*
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* @param output Json error output
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* @return True on success
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*/
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bool manual_failover(json_t** output);
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/**
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* Perform user-activated rejoin
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*
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* @param rejoin_server Server to join
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* @param output Json error output
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* @return True on success
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*/
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bool manual_rejoin(SERVER* rejoin_server, json_t** output);
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/**
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* Check if server is using gtid replication.
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*
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* @param mon_server Server to check
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* @param error_out Error output
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* @return True if using gtid-replication. False if not, or if server is not a slave or otherwise does
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* not have a gtid_IO_Pos.
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*/
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bool uses_gtid(MXS_MONITORED_SERVER* mon_server, json_t** error_out);
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/**
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* Get monitor-specific server info for the monitored server.
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*
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* @param handle
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* @param db Server to get info for. Must be a valid server or function crashes.
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* @return The server info.
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*/
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MariaDBServer* get_server_info(MXS_MONITORED_SERVER* db);
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/**
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* Constant version of get_server_info().
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*/
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const MariaDBServer* get_server_info(const MXS_MONITORED_SERVER* db) const;
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private:
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MXS_MONITOR* m_monitor_base; /**< Generic monitor object */
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THREAD m_thread; /**< Monitor thread */
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unsigned long m_id; /**< Monitor ID */
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volatile bool m_keep_running; /**< Set to false to cause monitor thread to exit. */
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volatile int m_status; /**< Monitor status. */
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ServerArray m_servers; /**< Servers of the monitor. */
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ServerInfoMap m_server_info; /**< Contains server specific information */
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// Values updated by monitor
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int64_t m_master_gtid_domain; /**< Gtid domain currently used by the master */
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std::string m_external_master_host; /**< External master host, for fail/switchover */
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int m_external_master_port; /**< External master port */
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MXS_MONITORED_SERVER *m_master; /**< Master server for MySQL Master/Slave replication */
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// Replication topology detection settings
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bool m_mysql51_replication; /**< Use MySQL 5.1 replication */
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bool m_detect_stale_master; /**< Monitor flag for MySQL replication Stale Master detection */
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bool m_detect_stale_slave; /**< Monitor flag for MySQL replication Stale Slave detection */
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bool m_detect_multimaster; /**< Detect and handle multi-master topologies */
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bool m_ignore_external_masters; /**< Ignore masters outside of the monitor configuration */
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bool m_detect_standalone_master; /**< If standalone master are detected */
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bool m_allow_cluster_recovery; /**< Allow failed servers to rejoin the cluster */
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bool m_warn_set_standalone_master; /**< Log a warning when setting standalone master */
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// Failover, switchover and rejoin settings
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std::string m_replication_user; /**< Replication user for CHANGE MASTER TO-commands */
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std::string m_replication_password; /**< Replication password for CHANGE MASTER TO-commands */
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int m_failcount; /**< How many monitoring cycles master must be down before auto-failover
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* begins */
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uint32_t m_failover_timeout; /**< Timeout in seconds for the master failover */
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uint32_t m_switchover_timeout; /**< Timeout in seconds for the master switchover */
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bool m_verify_master_failure; /**< Whether master failure is verified via slaves */
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int m_master_failure_timeout; /**< Master failure verification (via slaves) time in seconds */
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bool m_auto_failover; /**< If automatic master failover is enabled */
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bool m_auto_rejoin; /**< Attempt to start slave replication on standalone servers or servers
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* replicating from the wrong master automatically. */
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MonServerArray m_excluded_servers; /**< Servers banned for master promotion during auto-failover. */
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// Other settings
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std::string m_script; /**< Script to call when state changes occur on servers */
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uint64_t m_events; /**< enabled events */
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bool m_detect_replication_lag; /**< Monitor flag for MySQL replication heartbeat */
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enum slave_down_setting_t
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{
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ACCEPT_DOWN,
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REJECT_DOWN
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};
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MariaDBMonitor(MXS_MONITOR* monitor_base);
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~MariaDBMonitor();
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bool load_config_params(const MXS_CONFIG_PARAMETER* params);
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bool failover_wait_relay_log(MXS_MONITORED_SERVER* new_master, int seconds_remaining, json_t** err_out);
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bool switchover_demote_master(MXS_MONITORED_SERVER* current_master, MariaDBServer* info,
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json_t** err_out);
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bool switchover_wait_slaves_catchup(const MonServerArray& slaves, const GtidList& gtid, int total_timeout,
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int read_timeout, json_t** err_out);
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bool wait_cluster_stabilization(MXS_MONITORED_SERVER* new_master, const MonServerArray& slaves,
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int seconds_remaining);
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bool switchover_check_preferred_master(MXS_MONITORED_SERVER* preferred, json_t** err_out);
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bool promote_new_master(MXS_MONITORED_SERVER* new_master, json_t** err_out);
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MXS_MONITORED_SERVER* select_new_master(MonServerArray* slaves_out, json_t** err_out);
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bool server_is_excluded(const MXS_MONITORED_SERVER* server);
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bool is_candidate_better(const MariaDBServer* current_best_info, const MariaDBServer* candidate_info,
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uint32_t gtid_domain);
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MariaDBServer* update_slave_info(MXS_MONITORED_SERVER* server);
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void init_server_info();
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bool slave_receiving_events();
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void monitor_database(MariaDBServer* param_db);
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bool standalone_master_required(MXS_MONITORED_SERVER *db);
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bool set_standalone_master(MXS_MONITORED_SERVER *db);
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bool failover_not_possible();
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std::string generate_change_master_cmd(const std::string& master_host, int master_port);
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int redirect_slaves(MXS_MONITORED_SERVER* new_master, const MonServerArray& slaves,
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MonServerArray* redirected_slaves);
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bool set_replication_credentials(const MXS_CONFIG_PARAMETER* params);
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bool start_external_replication(MXS_MONITORED_SERVER* new_master, json_t** err_out);
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bool switchover_start_slave(MXS_MONITORED_SERVER* old_master, SERVER* new_master);
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bool redirect_one_slave(MXS_MONITORED_SERVER* slave, const char* change_cmd);
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bool get_joinable_servers(ServerRefArray* output);
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bool join_cluster(MXS_MONITORED_SERVER* server, const char* change_cmd);
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void set_master_heartbeat(MXS_MONITORED_SERVER *);
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void set_slave_heartbeat(MXS_MONITORED_SERVER *);
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MXS_MONITORED_SERVER* build_mysql51_replication_tree();
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MXS_MONITORED_SERVER* get_replication_tree();
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void monitor_mysql_db(MariaDBServer *serv_info);
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bool do_switchover(MariaDBServer** current_master, MariaDBServer** new_master, json_t** err_out);
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bool do_failover(json_t** err_out);
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uint32_t do_rejoin(const ServerRefArray& joinable_servers);
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bool mon_process_failover(bool* cluster_modified_out);
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bool server_is_rejoin_suspect(MariaDBServer* rejoin_cand, MariaDBServer* master, json_t** output);
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bool cluster_can_be_joined();
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bool failover_check(json_t** error_out);
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void disable_setting(const char* setting);
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bool switchover_check(SERVER* new_master, SERVER* current_master,
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MariaDBServer** new_master_out, MariaDBServer** current_master_out,
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json_t** error_out);
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bool switchover_check_new(const MXS_MONITORED_SERVER* monitored_server, json_t** error);
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bool switchover_check_current(const MXS_MONITORED_SERVER* suggested_curr_master,
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json_t** error_out) const;
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bool can_replicate_from(MariaDBServer* slave_cand, MariaDBServer* master);
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void monitor_one_server(MariaDBServer& server);
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MariaDBServer* find_root_master();
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void update_gtid_domain();
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void update_external_master();
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void assign_relay_master(MariaDBServer& serv_info);
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void update_server_states(MariaDBServer& db_server, MariaDBServer* root_master);
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void log_master_changes(MariaDBServer* root_master, int* log_no_master);
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void handle_auto_failover(bool* failover_performed);
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void measure_replication_lag(MariaDBServer* root_master);
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void handle_auto_rejoin();
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void find_graph_cycles();
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void check_maxscale_schema_replication();
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MXS_MONITORED_SERVER* getServerByNodeId(long);
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MXS_MONITORED_SERVER* getSlaveOfNodeId(long, slave_down_setting_t);
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};
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