739edcbe22
The sql queries are given in two text files, defined by options promotion_sql_file and demotion_sql_file. The files must exist when monitor starts. The files are read line by line, ignoring empty lines and lines starting with '#'. All other lines are sent to the server being promoted, demoted or rejoined. Any error in opening a file, reading it or executing the contents will cause the entire operation to fail. The filed defined in demotion_sql_file is also ran when rejoining a server. This is to ensure a previously failed master is "demoted" properly when it joins the cluster.
89 lines
4.2 KiB
C
89 lines
4.2 KiB
C
#pragma once
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#ifndef _MYSQLMON_H
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#define _MYSQLMON_H
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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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/**
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* @file mysqlmon.h - The MySQL monitor
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*/
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#include <maxscale/cdefs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <maxscale/monitor.h>
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#include <maxscale/spinlock.h>
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#include <maxscale/thread.h>
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#include <mysql.h>
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#include <mysqld_error.h>
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#include <maxscale/log_manager.h>
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#include <maxscale/secrets.h>
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#include <maxscale/dcb.h>
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#include <maxscale/modinfo.h>
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#include <maxscale/config.h>
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#include <maxscale/hashtable.h>
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MXS_BEGIN_DECLS
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/**
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* The handle for an instance of a MySQL Monitor module
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*/
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typedef struct
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{
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THREAD thread; /**< Monitor thread */
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int shutdown; /**< Flag to shutdown the monitor thread */
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int status; /**< Monitor status */
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unsigned long id; /**< Monitor ID */
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int replicationHeartbeat; /**< Monitor flag for MySQL replication heartbeat */
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bool detectStaleMaster; /**< Monitor flag for MySQL replication Stale Master detection */
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bool detectStaleSlave; /**< Monitor flag for MySQL replication Stale Master detection */
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bool multimaster; /**< Detect and handle multi-master topologies */
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bool ignore_external_masters; /**< Ignore masters outside of the monitor configuration */
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int disableMasterFailback; /**< Monitor flag for Galera Cluster Master failback */
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int availableWhenDonor; /**< Monitor flag for Galera Cluster Donor availability */
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int disableMasterRoleSetting; /**< Monitor flag to disable setting master role */
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bool mysql51_replication; /**< Use MySQL 5.1 replication */
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MXS_MONITORED_SERVER *master; /**< Master server for MySQL Master/Slave replication */
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char* script; /**< Script to call when state changes occur on servers */
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uint64_t events; /**< enabled events */
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HASHTABLE *server_info; /**< Contains server specific information */
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bool detect_standalone_master; /**< If standalone master are detected */
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int failcount; /**< How many monitoring cycles servers must be
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down before failover is initiated */
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bool allow_cluster_recovery; /**< Allow failed servers to rejoin the cluster */
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bool warn_set_standalone_master; /**< Log a warning when setting standalone master */
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bool auto_failover; /**< If automatic master failover is enabled */
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uint32_t failover_timeout; /**< Timeout in seconds for the master failover */
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uint32_t switchover_timeout; /**< Timeout in seconds for the master switchover */
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char* replication_user; /**< Replication user for failover */
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char* replication_password; /**< Replication password for failover*/
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bool verify_master_failure; /**< Whether master failure is verified via slaves */
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int master_failure_timeout; /**< Time in seconds to wait before doing failover */
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int64_t master_gtid_domain; /**< Gtid domain currently used by the master */
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char external_master_host[MAX_SERVER_ADDRESS_LEN]; /**< External master host, for fail/switchover */
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int external_master_port; /**< External master port */
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bool auto_rejoin; /**< Attempt to start slave replication on standalone servers or servers
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replicating from the wrong master. */
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int n_excluded; /**< Number of excluded servers */
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MXS_MONITORED_SERVER** excluded_servers; /**< Servers banned for master promotion during auto-failover. */
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const char* promote_sql_file; /**< File with sql commands which are ran to a server being promoted. */
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const char* demote_sql_file; /**< File with sql commands which are ran to a server being demoted. */
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MXS_MONITOR* monitor;
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} MYSQL_MONITOR;
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MXS_END_DECLS
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#endif
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