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38 lines
1004 B
C++
38 lines
1004 B
C++
#pragma once
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#include <memory>
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#include <Storages/MergeTree/RequestResponse.h>
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namespace DB
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{
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/// The main class to spread mark ranges across replicas dynamically
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/// The reason why it uses pimpl - this header file is included in
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/// multiple other files like Context or RemoteQueryExecutor
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class ParallelReplicasReadingCoordinator
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{
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public:
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class ImplInterface;
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explicit ParallelReplicasReadingCoordinator(size_t replicas_count_);
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~ParallelReplicasReadingCoordinator();
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void setMode(CoordinationMode mode);
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void handleInitialAllRangesAnnouncement(InitialAllRangesAnnouncement);
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ParallelReadResponse handleRequest(ParallelReadRequest request);
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private:
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void initialize();
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std::mutex mutex;
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size_t replicas_count{0};
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CoordinationMode mode{CoordinationMode::Default};
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std::atomic<bool> initialized{false};
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std::unique_ptr<ImplInterface> pimpl;
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};
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using ParallelReplicasReadingCoordinatorPtr = std::shared_ptr<ParallelReplicasReadingCoordinator>;
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}
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