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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
#pragma once
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#include <DB/Interpreters/InterserverIOHandler.h>
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#include <DB/Storages/MergeTree/MergeTreeData.h>
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#include <DB/IO/HashingWriteBuffer.h>
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#include <DB/IO/copyData.h>
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namespace DB
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{
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namespace DataPartsExchange
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{
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/** Сервис для отправки кусков из таблицы *MergeTree.
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*/
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class Service final : public InterserverIOEndpoint
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{
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public:
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Service(MergeTreeData & data_, StoragePtr & storage_) : data(data_),
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owned_storage(storage_), log(&Logger::get(data.getLogName() + " (Replicated PartsService)")) {}
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Service(const Service &) = delete;
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Service & operator=(const Service &) = delete;
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std::string getId(const std::string & node_id) const override;
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void processQuery(const Poco::Net::HTMLForm & params, ReadBuffer & body, WriteBuffer & out) override;
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private:
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MergeTreeData::DataPartPtr findPart(const String & name);
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MergeTreeData::DataPartPtr findShardedPart(const String & name, size_t shard_no);
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private:
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MergeTreeData & data;
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StoragePtr owned_storage;
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Logger * log;
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};
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/** Клиент для получения кусков из таблицы *MergeTree.
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*/
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class Fetcher final
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{
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public:
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Fetcher(MergeTreeData & data_) : data(data_), log(&Logger::get("Fetcher")) {}
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Fetcher(const Fetcher &) = delete;
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Fetcher & operator=(const Fetcher &) = delete;
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/// Скачивает кусок в tmp_директорию. Если to_detached - скачивает в директорию detached.
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MergeTreeData::MutableDataPartPtr fetchPart(
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const String & part_name,
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const String & replica_path,
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const String & host,
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int port,
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bool to_detached = false);
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/// Метод для перешардирования. Скачивает шардированный кусок
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/// из заданного шарда в папку to_detached.
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MergeTreeData::MutableDataPartPtr fetchShardedPart(
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const InterserverIOEndpointLocation & location,
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const String & part_name,
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size_t shard_no);
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void cancel() { is_cancelled = true; }
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private:
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MergeTreeData::MutableDataPartPtr fetchPartImpl(
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const String & part_name,
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const String & replica_path,
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const String & host,
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int port,
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const String & shard_no,
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bool to_detached);
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private:
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MergeTreeData & data;
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/// Нужно остановить передачу данных.
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std::atomic<bool> is_cancelled {false};
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Logger * log;
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};
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}
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}
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