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73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
#pragma once
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#include <Core/Types.h>
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#include <Common/ZooKeeper/Types.h>
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#include <Common/ZooKeeper/ZooKeeper.h>
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#include <common/logger_useful.h>
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#include <Common/randomSeed.h>
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#include <Core/BackgroundSchedulePool.h>
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#include <thread>
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#include <map>
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#include <unordered_map>
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#include <pcg_random.hpp>
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namespace DB
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{
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class StorageReplicatedMergeTree;
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/** Removes obsolete data from a table of type ReplicatedMergeTree.
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*/
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class ReplicatedMergeTreeCleanupThread
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{
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public:
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ReplicatedMergeTreeCleanupThread(StorageReplicatedMergeTree & storage_);
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void start() { task->activateAndSchedule(); }
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void wakeup() { task->schedule(); }
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void stop() { task->deactivate(); }
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private:
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StorageReplicatedMergeTree & storage;
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String log_name;
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Poco::Logger * log;
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BackgroundSchedulePool::TaskHolder task;
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pcg64 rng{randomSeed()};
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void run();
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void iterate();
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/// Remove old records from ZooKeeper.
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void clearOldLogs();
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/// The replica is marked as "lost" if it is inactive and its log pointer
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/// is far behind and we are not going to keep logs for it.
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/// Lost replicas will use different strategy for repair.
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void markLostReplicas(const std::unordered_map<String, UInt32> & host_versions_lost_replicas,
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const std::unordered_map<String, String> & log_pointers_candidate_lost_replicas,
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size_t replicas_count, const zkutil::ZooKeeperPtr & zookeeper);
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/// Remove old block hashes from ZooKeeper. This is done by the leader replica.
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void clearOldBlocks();
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/// Remove old mutations that are done from ZooKeeper. This is done by the leader replica.
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void clearOldMutations();
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using NodeCTimeCache = std::map<String, Int64>;
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NodeCTimeCache cached_block_stats;
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struct NodeWithStat;
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/// Returns list of blocks (with their stat) sorted by ctime in descending order.
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void getBlocksSortedByTime(zkutil::ZooKeeper & zookeeper, std::vector<NodeWithStat> & timed_blocks);
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/// TODO Removing old quorum/failed_parts
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};
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}
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