ClickHouse/dbms/include/DB/Storages/MergeTree/DataPartsExchange.h
2016-11-16 02:55:45 +03:00

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