2b5ec8f162
When a Galera cluster loses a member, it will recalculate the wsrep_local_index values. As the index is zero-based, we can be certain that in a valid cluster there will always be a node with an index of 0. If the galeramon can't find a node with an index of 0, it means that either the cluster hasn't stabilized and there's a pending recalculation of the index or that there's no connectivity between MaxScale and the node with the index value 0. With this change and default settings, active-active MaxScale setups with Galera clusters should always choose the same node as the master.
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#pragma once
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#ifndef _GALERAMON_H
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#define _GALERAMON_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/bsl.
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*
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* Change Date: 2019-07-01
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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 galeramon.h - The Galera cluster monitor
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 07/05/15 Markus Makela Initial Implementation of galeramon.h
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* @endverbatim
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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/externcmd.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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MXS_BEGIN_DECLS
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/**
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* The handle for an instance of a Galera Monitor module
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*/
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typedef struct
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{
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SPINLOCK lock; /**< The monitor spinlock */
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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 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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MONITOR_SERVERS *master; /**< Master server for MySQL Master/Slave replication */
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char* script;
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bool root_node_as_master; /**< Whether we require that the Master should
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* have a wsrep_local_index of 0 */
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bool use_priority; /*< Use server priorities */
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bool events[MAX_MONITOR_EVENT]; /*< enabled events */
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} GALERA_MONITOR;
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MXS_END_DECLS
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#endif
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