c643cbd30c
The current load process is: Tablet Sink -> Tablet Channel Mgr -> Tablets Channel -> Delta Writer -> MemTable -> Flush to disk In the path of Tablets Channel -> DeltaWriter -> MemTable -> Flush to disk, the following operations are performed: Insert tuple into different memtables according to tablet ID When the memtable size reaches the threshold, it is written to disk. The above operations are equivalent to single thread execution for a single load task. In fact, the insertion of memtable and the flush of memtable can be executed synchronously. Perform these operation in single thread prevents the insertion of memtable from being delayed due to slow disk writing. In the new implementation, I added a MemTableFlushExecutor class with a set of flush queues and corresponding worker threads. By default, each data directory uses two worker threads for flush, which can be modified by the parameter flush_thread_num_per_store of BE. DeltaWriter will push the full memtable to MemTableFlushExecutor for flush operation and generate a new memtable for receiving new data. This design can improve the performance of load large files. In single host testing, the time to load a 1GB text file is reduced from 48 seconds to 29 seconds.
87 lines
2.1 KiB
C++
87 lines
2.1 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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#include "util/counter_cond_variable.hpp"
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#include <thread>
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#include <gtest/gtest.h>
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#include "common/logging.h"
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namespace doris {
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CounterCondVariable g_cond;
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std::mutex g_io_mu;
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class CounterCondVariableTest : public testing::Test {
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public:
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CounterCondVariableTest() { }
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virtual ~CounterCondVariableTest() { }
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};
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void submitter() {
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for (int i = 0; i < 10; ++i) {
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g_cond.inc();
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}
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}
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void worker() {
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for (int i = 0; i < 10; ++i) {
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{
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std::unique_lock<std::mutex> lock(g_io_mu);
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std::cout << "worker " << i << std::endl;
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}
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sleep(1);
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g_cond.dec();
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}
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}
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void waiter() {
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g_cond.block_wait();
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std::cout << "wait finished" << std::endl;
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}
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TEST_F(CounterCondVariableTest, test) {
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g_cond.block_wait();
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g_cond.inc(10);
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g_cond.dec(10);
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g_cond.block_wait();
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std::thread submit(submitter);
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std::thread wait1(waiter);
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std::thread wait2(waiter);
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std::thread work1(worker);
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std::thread work2(worker);
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submit.join();
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wait1.join();
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wait2.join();
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work1.join();
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work2.join();
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g_cond.inc(10);
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g_cond.dec_to_zero();
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g_cond.block_wait();
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}
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}
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int main(int argc, char* argv[]) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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