c617fc9064
For a tablet, there may be multiple memtables, which will be flushed to disk one by one in the order of generation. If a memtable flush fails, then the load job will definitely fail, but the previous implementation will overwrite `_flush_status`, which may make the error can not be detected, leads to an error load job to be success. This patch also have two other changes: 1. Use `std::bind` to replace `boost::bind`; 2. Removes some unneeded headers.
106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
|
|
// or more contributor license agreements. See the NOTICE file
|
|
// distributed with this work for additional information
|
|
// regarding copyright ownership. The ASF licenses this file
|
|
// to you under the Apache License, Version 2.0 (the
|
|
// "License"); you may not use this file except in compliance
|
|
// with the License. You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing,
|
|
// software distributed under the License is distributed on an
|
|
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
// KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations
|
|
// under the License.
|
|
|
|
#pragma once
|
|
|
|
#include <atomic>
|
|
#include <memory>
|
|
#include <vector>
|
|
|
|
#include "olap/olap_define.h"
|
|
#include "util/threadpool.h"
|
|
|
|
namespace doris {
|
|
|
|
class DataDir;
|
|
class DeltaWriter;
|
|
class ExecEnv;
|
|
class MemTable;
|
|
|
|
// the statistic of a certain flush handler.
|
|
// use atomic because it may be updated by multi threads
|
|
struct FlushStatistic {
|
|
int64_t flush_time_ns = 0;
|
|
int64_t flush_count= 0;
|
|
int64_t flush_size_bytes = 0;
|
|
};
|
|
|
|
std::ostream& operator<<(std::ostream& os, const FlushStatistic& stat);
|
|
|
|
// A thin wrapper of ThreadPoolToken to submit task.
|
|
// For a tablet, there may be multiple memtables, which will be flushed to disk
|
|
// one by one in the order of generation.
|
|
// If a memtable flush fails, then:
|
|
// 1. Immediately disallow submission of any subsequent memtable
|
|
// 2. For the memtables that have already been submitted, there is no need to flush,
|
|
// because the entire job will definitely fail;
|
|
class FlushToken {
|
|
public:
|
|
explicit FlushToken(std::unique_ptr<ThreadPoolToken> flush_pool_token) :
|
|
_flush_token(std::move(flush_pool_token)),
|
|
_flush_status(OLAP_SUCCESS) { }
|
|
|
|
OLAPStatus submit(const std::shared_ptr<MemTable>& mem_table);
|
|
|
|
// error has happpens, so we cancel this token
|
|
// And remove all tasks in the queue.
|
|
void cancel();
|
|
|
|
// wait all tasks in token to be completed.
|
|
OLAPStatus wait();
|
|
|
|
// get flush operations' statistics
|
|
const FlushStatistic& get_stats() const { return _stats; }
|
|
|
|
private:
|
|
void _flush_memtable(std::shared_ptr<MemTable> mem_table);
|
|
|
|
std::unique_ptr<ThreadPoolToken> _flush_token;
|
|
|
|
// Records the current flush status of the tablet.
|
|
// Note: Once its value is set to Failed, it cannot return to SUCCESS.
|
|
std::atomic<OLAPStatus> _flush_status;
|
|
|
|
FlushStatistic _stats;
|
|
};
|
|
|
|
// MemTableFlushExecutor is responsible for flushing memtables to disk.
|
|
// It encapsulate a ThreadPool to handle all tasks.
|
|
// Usage Example:
|
|
// ...
|
|
// std::shared_ptr<FlushHandler> flush_handler;
|
|
// memTableFlushExecutor.create_flush_token(path_hash, &flush_handler);
|
|
// ...
|
|
// flush_token->submit(memtable)
|
|
// ...
|
|
class MemTableFlushExecutor {
|
|
public:
|
|
MemTableFlushExecutor() {}
|
|
~MemTableFlushExecutor() {}
|
|
|
|
// init should be called after storage engine is opened,
|
|
// because it needs path hash of each data dir.
|
|
void init(const std::vector<DataDir*>& data_dirs);
|
|
|
|
OLAPStatus create_flush_token(std::unique_ptr<FlushToken>* flush_token);
|
|
|
|
private:
|
|
std::unique_ptr<ThreadPool> _flush_pool;
|
|
};
|
|
|
|
} // end namespace
|