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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
#pragma once
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#include <Poco/Event.h>
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#include <common/logger_useful.h>
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#include <Core/BackgroundSchedulePool.h>
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#include <Core/Types.h>
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#include <thread>
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#include <atomic>
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namespace DB
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{
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class StorageReplicatedMergeTree;
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/** Initializes ZK session.
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* Exposes ephemeral nodes. It sets the node values that are required for replica detection.
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* Starts participation in the leader selection. Starts all background threads.
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* Then monitors whether the session has expired. And if it expired, it will reinitialize it.
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*/
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class ReplicatedMergeTreeRestartingThread
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{
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public:
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ReplicatedMergeTreeRestartingThread(StorageReplicatedMergeTree & storage_);
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void start() { task->activateAndSchedule(); }
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void wakeup() { task->schedule(); }
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void shutdown();
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private:
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StorageReplicatedMergeTree & storage;
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String log_name;
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Logger * log;
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std::atomic<bool> need_stop {false};
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/// The random data we wrote into `/replicas/me/is_active`.
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String active_node_identifier;
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BackgroundSchedulePool::TaskHolder task;
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Int64 check_period_ms; /// The frequency of checking expiration of session in ZK.
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bool first_time = true; /// Activate replica for the first time.
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time_t prev_time_of_check_delay = 0;
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bool startup_completed = false;
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void run();
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/// Start or stop background threads. Used for partial reinitialization when re-creating a session in ZooKeeper.
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bool tryStartup(); /// Returns false if ZooKeeper is not available.
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/// Note in ZooKeeper that this replica is currently active.
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void activateReplica();
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/// Delete the parts for which the quorum has failed (for the time when the replica was inactive).
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void removeFailedQuorumParts();
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/// If there is an unreachable quorum, and we have a part, then add this replica to the quorum.
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void updateQuorumIfWeHavePart();
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void partialShutdown();
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};
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}
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