4b15185e25
1. Add hdfs file handle cache for hdfs file reader
Copied from Impala, `https://github.com/apache/impala/blob/master/be/src/util/lru-multi-cache.h`. (Thanks for the Impala team)
This is a lru cache that can store multi entries with same key.
The key is build with {file name + modification time}
The value is the hdfsFile pointer that point to a certain hdfs file.
This cache is to avoid reopen same hdfs file mutli time, which can save
query time.
Add a BE config `max_hdfs_file_handle_cache_num` to limit the max number
of file handle cache, default is 20000.
2. Add file meta cache
The file meta cache is a lru cache. the key is {file name + modification time},
the value is the parsed file meta info of the certain file, which can save
the time of re-parsing file meta everytime.
Currently, it is only used for caching parquet file footer.
The test show that is cache is hit, the `FileOpenTime` and `ParseFooterTime` is reduce to almost 0
in query profile, which can save time when there are lots of files to read.
79 lines
2.5 KiB
C++
79 lines
2.5 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 "olap/file_header.h"
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#include <gmock/gmock-actions.h>
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#include <gmock/gmock-matchers.h>
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#include <gtest/gtest-message.h>
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#include <gtest/gtest-test-part.h>
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#include <filesystem>
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#include "common/status.h"
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#include "gtest/gtest_pred_impl.h"
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#include "testutil/test_util.h"
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using ::testing::_;
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using ::testing::Return;
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using ::testing::SetArgPointee;
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using std::string;
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namespace doris {
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class FileHeaderTest : public testing::Test {
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public:
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virtual void SetUp() {
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std::filesystem::remove_all(_s_test_data_path);
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EXPECT_FALSE(std::filesystem::exists(_s_test_data_path));
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EXPECT_TRUE(std::filesystem::create_directory(_s_test_data_path));
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}
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virtual void TearDown() { EXPECT_TRUE(std::filesystem::remove_all(_s_test_data_path)); }
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static std::string _s_test_data_path;
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};
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std::string FileHeaderTest::_s_test_data_path = "./file_handler_testxxxx123";
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TEST_F(FileHeaderTest, TestWrite) {
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std::shared_ptr<io::LocalFileSystem> fs = io::global_local_filesystem();
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std::string file_name = _s_test_data_path + "/abcd123.txt";
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bool exists = true;
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EXPECT_TRUE(fs->exists(file_name, &exists).ok());
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EXPECT_FALSE(exists);
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io::FileWriterPtr file_writer;
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EXPECT_TRUE(fs->create_file(file_name, &file_writer).ok());
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// write 12 bytes to disk
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char ten_bytes[12];
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memset(&ten_bytes, 0, sizeof(ten_bytes));
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EXPECT_TRUE(file_writer->append({ten_bytes, sizeof(ten_bytes)}).ok());
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char large_bytes2[(1 << 10)];
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memset(&large_bytes2, 0, sizeof(large_bytes2));
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int i = 1;
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while (i < LOOP_LESS_OR_MORE(1 << 10, 1 << 17)) {
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EXPECT_TRUE(file_writer->append({large_bytes2, sizeof(large_bytes2)}).ok());
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++i;
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}
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EXPECT_TRUE(file_writer->close().ok());
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}
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} // namespace doris
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