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90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
#pragma once
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#include <Interpreters/TransactionVersionMetadata.h>
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#include <boost/noncopyable.hpp>
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#include <Storages/IStorage_fwd.h>
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#include <Storages/TableLockHolder.h>
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#include <Common/Stopwatch.h>
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#include <base/scope_guard.h>
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#include <list>
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#include <unordered_set>
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namespace DB
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{
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class IMergeTreeDataPart;
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using DataPartPtr = std::shared_ptr<const IMergeTreeDataPart>;
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using DataPartsVector = std::vector<DataPartPtr>;
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/// This object is responsible for tracking all changes that some transaction is making in MergeTree tables.
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/// It collects all changes that queries of current transaction made in data part sets of all MergeTree tables
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/// to either make them visible when transaction commits or undo when transaction rolls back.
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class MergeTreeTransaction : public std::enable_shared_from_this<MergeTreeTransaction>, private boost::noncopyable
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{
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friend class TransactionLog;
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public:
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enum State
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{
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RUNNING,
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COMMITTING,
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COMMITTED,
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ROLLED_BACK,
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};
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CSN getSnapshot() const { return snapshot.load(std::memory_order_relaxed); }
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void setSnapshot(CSN new_snapshot);
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State getState() const;
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const TransactionID tid;
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MergeTreeTransaction(CSN snapshot_, LocalTID local_tid_, UUID host_id, std::list<CSN>::iterator snapshot_it_);
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void addNewPart(const StoragePtr & storage, const DataPartPtr & new_part);
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void removeOldPart(const StoragePtr & storage, const DataPartPtr & part_to_remove, const TransactionInfoContext & context);
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void addMutation(const StoragePtr & table, const String & mutation_id);
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static void addNewPart(const StoragePtr & storage, const DataPartPtr & new_part, MergeTreeTransaction * txn);
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static void removeOldPart(const StoragePtr & storage, const DataPartPtr & part_to_remove, MergeTreeTransaction * txn);
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static void addNewPartAndRemoveCovered(const StoragePtr & storage, const DataPartPtr & new_part, const DataPartsVector & covered_parts, MergeTreeTransaction * txn);
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bool isReadOnly() const;
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void onException();
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String dumpDescription() const;
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Float64 elapsedSeconds() const { return elapsed.elapsedSeconds(); }
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/// Waits for transaction state to become not equal to the state corresponding to current_state_csn
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bool waitStateChange(CSN current_state_csn) const;
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CSN getCSN() const { return csn; }
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private:
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scope_guard beforeCommit();
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void afterCommit(CSN assigned_csn) noexcept;
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bool rollback() noexcept;
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void checkIsNotCancelled() const;
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mutable std::mutex mutex;
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Stopwatch elapsed;
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/// Usually it's equal to tid.start_csn, but can be changed by SET SNAPSHOT query (for introspection purposes and time-traveling)
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std::atomic<CSN> snapshot;
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const std::list<CSN>::iterator snapshot_in_use_it;
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/// Lists of changes made by transaction
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std::unordered_set<StoragePtr> storages TSA_GUARDED_BY(mutex);
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DataPartsVector creating_parts TSA_GUARDED_BY(mutex);
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DataPartsVector removing_parts TSA_GUARDED_BY(mutex);
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using RunningMutationsList = std::vector<std::pair<StoragePtr, String>>;
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RunningMutationsList mutations TSA_GUARDED_BY(mutex);
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std::atomic<CSN> csn;
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};
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using MergeTreeTransactionPtr = std::shared_ptr<MergeTreeTransaction>;
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}
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