6b556859ce
From system.membership we can find out what server exist in the
cluster while system.nodeinfo contains information about those
servers. If a node goes down, it will disappear from system.nodeinfo,
but not from system.membership. Consequently, we must start from
system.membership and then fetch more information from system.nodeinfo.
Incidentally, a query like
SELECT ms.nid, ni.iface_ip
FROM system.membership AS ms
LEFT JOIN system.nodeinfo AS ni ON ms.nid=ni.nodeid;
should provide all information in one go, but it seems that such joins
are not supported on the system tables.
99 lines
2.6 KiB
C++
99 lines
2.6 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: 2022-01-01
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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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#include "clustrixmon.hh"
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#include <map>
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#include <maxscale/monitor.hh>
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#include <maxbase/http.hh>
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#include "clustrixmembership.hh"
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#include "clustrixnode.hh"
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class ClustrixMonitor : public maxscale::MonitorInstance
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{
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ClustrixMonitor(const ClustrixMonitor&) = delete;
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ClustrixMonitor& operator=(const ClustrixMonitor&) = delete;
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public:
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class Config
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{
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public:
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Config()
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: m_cluster_monitor_interval(DEFAULT_CLUSTER_MONITOR_INTERVAL_VALUE)
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, m_health_check_threshold(DEFAULT_HEALTH_CHECK_THRESHOLD_VALUE)
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{
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};
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long cluster_monitor_interval() const
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{
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return m_cluster_monitor_interval;
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}
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void set_cluster_monitor_interval(long l)
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{
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m_cluster_monitor_interval = l;
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}
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long health_check_threshold() const
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{
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return m_health_check_threshold;
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}
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void set_health_check_threshold(long l)
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{
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m_health_check_threshold = l;
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}
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private:
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long m_cluster_monitor_interval;
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long m_health_check_threshold;
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};
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~ClustrixMonitor();
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static ClustrixMonitor* create(MXS_MONITOR* pMonitor);
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bool configure(const MXS_CONFIG_PARAMETER* pParams) override;
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private:
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ClustrixMonitor(MXS_MONITOR* pMonitor);
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void pre_loop() override;
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void post_loop() override;
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void tick();
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void update_cluster_nodes();
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void update_cluster_nodes(MXS_MONITORED_SERVER& ms);
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void refresh_cluster_nodes();
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bool check_cluster_membership(MXS_MONITORED_SERVER& ms, std::map<int, ClustrixMembership>* pMemberships);
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void update_server_statuses();
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void make_health_check();
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void initiate_delayed_http_check();
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bool check_http(Call::action_t action);
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static long now()
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{
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return mxb::WorkerLoad::get_time_ms();
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}
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private:
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Config m_config;
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std::map<int, ClustrixNode> m_nodes;
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std::vector<std::string> m_health_urls;
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mxb::http::Async m_http;
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uint32_t m_delayed_http_check_id { 0 };
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long m_last_cluster_check { 0 };
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MXS_MONITORED_SERVER* m_pMonitored_server { nullptr };
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};
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