f4a51e0b47
Galeramon will now only use the larger cluster in case a split brain situation occurs. If the clusters are of equal size, the one whose UUID compares less will be used. This will guarantee that all MaxScales that see the same picture will end up using the same cluster.
84 lines
3.1 KiB
C++
84 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018 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: 2023-01-01
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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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#pragma once
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/**
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* @file galeramon.hh - The Galera cluster monitor
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*/
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#include <maxscale/ccdefs.hh>
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#include <unordered_map>
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#include <maxscale/monitor.hh>
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/**
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* Galera status variables
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*/
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struct GaleraNode
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{
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int joined; /**< Node is in sync with the cluster */
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int local_index; /**< Node index */
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int local_state; /**< Node state */
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int cluster_size; /**< The cluster size*/
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std::string cluster_uuid; /**< Cluster UUID */
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std::string gtid_binlog_pos;
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std::string gtid_current_pos;
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bool read_only = false;
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int master_id;
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int server_id;
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};
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typedef std::unordered_map<mxs::MonitorServer*, GaleraNode> NodeMap;
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class GaleraMonitor : public maxscale::MonitorWorkerSimple
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{
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public:
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GaleraMonitor(const GaleraMonitor&) = delete;
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GaleraMonitor& operator=(const GaleraMonitor&) = delete;
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~GaleraMonitor();
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static GaleraMonitor* create(const std::string& name, const std::string& module);
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void diagnostics(DCB* dcb) const;
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json_t* diagnostics_json() const;
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protected:
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bool configure(const MXS_CONFIG_PARAMETER* param);
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bool has_sufficient_permissions();
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void update_server_status(mxs::MonitorServer* monitored_server);
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void pre_tick();
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void post_tick();
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private:
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int m_disableMasterFailback; /**< Monitor flag for Galera Cluster Master failback */
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int m_availableWhenDonor; /**< Monitor flag for Galera Cluster Donor availability */
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bool m_disableMasterRoleSetting; /**< Monitor flag to disable setting master role */
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bool m_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 m_use_priority; /**< Use server priorities */
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bool m_set_donor_nodes; /**< set the wrep_sst_donor variable with an
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* ordered list of nodes */
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std::string m_cluster_uuid; /**< The Cluster UUID */
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bool m_log_no_members; /**< Should we log if no member are found. */
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NodeMap m_info; /**< Contains Galera Cluster variables of all nodes */
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int m_cluster_size; /**< How many nodes in the cluster */
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GaleraMonitor(const std::string& name, const std::string& module);
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bool detect_cluster_size(const int n_nodes,
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const char* candidate_uuid,
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const int candidate_size);
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mxs::MonitorServer* get_candidate_master();
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void set_galera_cluster();
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void update_sst_donor_nodes(int is_cluster);
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void calculate_cluster();
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};
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