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https://github.com/ClickHouse/ClickHouse.git
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140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
#pragma once
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#include <Parsers/formatAST.h>
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#include <DataStreams/IBlockOutputStream.h>
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#include <Core/Block.h>
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#include <Common/PODArray.h>
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#include <Common/Throttler.h>
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#include <Common/ThreadPool.h>
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#include <atomic>
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#include <memory>
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#include <chrono>
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#include <optional>
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#include <Interpreters/Cluster.h>
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#include <Interpreters/Context.h>
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namespace Poco
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{
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class Logger;
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}
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namespace DB
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{
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class StorageDistributed;
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/** If insert_sync_ is true, the write is synchronous. Uses insert_timeout_ if it is not zero.
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* Otherwise, the write is asynchronous - the data is first written to the local filesystem, and then sent to the remote servers.
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* If the Distributed table uses more than one shard, then in order to support the write,
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* when creating the table, an additional parameter must be specified for ENGINE - the sharding key.
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* Sharding key is an arbitrary expression from the columns. For example, rand() or UserID.
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* When writing, the data block is splitted by the remainder of the division of the sharding key by the total weight of the shards,
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* and the resulting blocks are written in a compressed Native format in separate directories for sending.
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* For each destination address (each directory with data to send), a separate thread is created in StorageDistributed,
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* which monitors the directory and sends data. */
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class DistributedBlockOutputStream : public IBlockOutputStream
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{
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public:
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DistributedBlockOutputStream(const Context & context_, StorageDistributed & storage_, const ASTPtr & query_ast_,
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const ClusterPtr & cluster_, bool insert_sync_, UInt64 insert_timeout_);
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Block getHeader() const override;
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void write(const Block & block) override;
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void writePrefix() override;
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void writeSuffix() override;
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private:
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IColumn::Selector createSelector(const Block & source_block);
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void writeAsync(const Block & block);
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/// Split block between shards.
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Blocks splitBlock(const Block & block);
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void writeSplitAsync(const Block & block);
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void writeAsyncImpl(const Block & block, const size_t shard_id = 0);
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/// Increments finished_writings_count after each repeat.
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void writeToLocal(const Block & block, const size_t repeats);
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void writeToShard(const Block & block, const std::vector<std::string> & dir_names);
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/// Performs synchronous insertion to remote nodes. If timeout_exceeded flag was set, throws.
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void writeSync(const Block & block);
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void initWritingJobs(const Block & first_block);
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struct JobReplica;
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ThreadPool::Job runWritingJob(JobReplica & job, const Block & current_block);
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void waitForJobs();
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/// Returns the number of blocks was written for each cluster node. Uses during exception handling.
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std::string getCurrentStateDescription();
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private:
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const Context & context;
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StorageDistributed & storage;
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ASTPtr query_ast;
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String query_string;
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ClusterPtr cluster;
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size_t inserted_blocks = 0;
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size_t inserted_rows = 0;
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bool insert_sync;
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/// Sync-related stuff
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UInt64 insert_timeout; // in seconds
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Stopwatch watch;
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Stopwatch watch_current_block;
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std::optional<ThreadPool> pool;
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ThrottlerPtr throttler;
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struct JobReplica
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{
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JobReplica() = default;
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JobReplica(size_t shard_index_, size_t replica_index_, bool is_local_job_, const Block & sample_block)
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: shard_index(shard_index_), replica_index(replica_index_), is_local_job(is_local_job_), current_shard_block(sample_block.cloneEmpty()) {}
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size_t shard_index = 0;
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size_t replica_index = 0;
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bool is_local_job = false;
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Block current_shard_block;
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ConnectionPool::Entry connection_entry;
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std::unique_ptr<Context> local_context;
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BlockOutputStreamPtr stream;
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UInt64 blocks_written = 0;
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UInt64 rows_written = 0;
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UInt64 blocks_started = 0;
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UInt64 elapsed_time_ms = 0;
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UInt64 max_elapsed_time_for_block_ms = 0;
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};
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struct JobShard
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{
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std::list<JobReplica> replicas_jobs;
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IColumn::Permutation shard_current_block_permutation;
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};
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std::vector<JobShard> per_shard_jobs;
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size_t remote_jobs_count = 0;
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size_t local_jobs_count = 0;
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std::atomic<unsigned> finished_jobs_count{0};
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Poco::Logger * log;
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};
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}
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