e412dd12e8
Currently, there are some useless includes in the codebase. We can use a tool named include-what-you-use to optimize these includes. By using a strict include-what-you-use policy, we can get lots of benefits from it.
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <stdint.h>
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#include <atomic>
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#include <iosfwd>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "common/status.h"
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#include "util/threadpool.h"
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namespace doris {
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class DataDir;
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class MemTable;
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enum RowsetTypePB : int;
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// the statistic of a certain flush handler.
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// use atomic because it may be updated by multi threads
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struct FlushStatistic {
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std::atomic_uint64_t flush_time_ns = 0;
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std::atomic_uint64_t flush_running_count = 0;
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std::atomic_uint64_t flush_finish_count = 0;
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std::atomic_uint64_t flush_size_bytes = 0;
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std::atomic_uint64_t flush_disk_size_bytes = 0;
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std::atomic_uint64_t flush_wait_time_ns = 0;
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};
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std::ostream& operator<<(std::ostream& os, const FlushStatistic& stat);
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// A thin wrapper of ThreadPoolToken to submit task.
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// For a tablet, there may be multiple memtables, which will be flushed to disk
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// one by one in the order of generation.
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// If a memtable flush fails, then:
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// 1. Immediately disallow submission of any subsequent memtable
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// 2. For the memtables that have already been submitted, there is no need to flush,
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// because the entire job will definitely fail;
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class FlushToken {
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public:
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explicit FlushToken(std::unique_ptr<ThreadPoolToken> flush_pool_token)
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: _flush_token(std::move(flush_pool_token)), _flush_status(ErrorCode::OK) {}
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Status submit(std::unique_ptr<MemTable> mem_table);
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// error has happens, so we cancel this token
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// And remove all tasks in the queue.
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void cancel();
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// wait all tasks in token to be completed.
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Status wait();
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// get flush operations' statistics
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const FlushStatistic& get_stats() const { return _stats; }
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private:
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friend class MemtableFlushTask;
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void _flush_memtable(MemTable* mem_table, int64_t submit_task_time);
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std::unique_ptr<ThreadPoolToken> _flush_token;
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// Records the current flush status of the tablet.
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// Note: Once its value is set to Failed, it cannot return to SUCCESS.
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std::atomic<int> _flush_status;
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FlushStatistic _stats;
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};
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// MemTableFlushExecutor is responsible for flushing memtables to disk.
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// It encapsulate a ThreadPool to handle all tasks.
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// Usage Example:
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// ...
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// std::shared_ptr<FlushHandler> flush_handler;
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// memTableFlushExecutor.create_flush_token(&flush_handler);
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// ...
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// flush_token->submit(memtable)
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// ...
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class MemTableFlushExecutor {
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public:
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MemTableFlushExecutor() {}
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~MemTableFlushExecutor() {
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_flush_pool->shutdown();
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_high_prio_flush_pool->shutdown();
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}
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// init should be called after storage engine is opened,
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// because it needs path hash of each data dir.
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void init(const std::vector<DataDir*>& data_dirs);
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Status create_flush_token(std::unique_ptr<FlushToken>* flush_token, RowsetTypePB rowset_type,
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bool should_serial, bool is_high_priority);
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private:
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std::unique_ptr<ThreadPool> _flush_pool;
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std::unique_ptr<ThreadPool> _high_prio_flush_pool;
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};
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} // namespace doris
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