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12f1137355
Summary: Introduces and uses a SystemClock class to RocksDB. This class contains the time-related functions of an Env and these functions can be redirected from the Env to the SystemClock. Many of the places that used an Env (Timer, PerfStepTimer, RepeatableThread, RateLimiter, WriteController) for time-related functions have been changed to use SystemClock instead. There are likely more places that can be changed, but this is a start to show what can/should be done. Over time it would be nice to migrate most (if not all) of the uses of the time functions from the Env to the SystemClock. There are several Env classes that implement these functions. Most of these have not been converted yet to SystemClock implementations; that will come in a subsequent PR. It would be good to unify many of the Mock Timer implementations, so that they behave similarly and be tested similarly (some override Sleep, some use a MockSleep, etc). Additionally, this change will allow new methods to be introduced to the SystemClock (like https://github.com/facebook/rocksdb/issues/7101 WaitFor) in a consistent manner across a smaller number of classes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7858 Reviewed By: pdillinger Differential Revision: D26006406 Pulled By: mrambacher fbshipit-source-id: ed10a8abbdab7ff2e23d69d85bd25b3e7e899e90
270 lines
9.1 KiB
C++
270 lines
9.1 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "db/blob/blob_file_cache.h"
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#include <cassert>
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#include <string>
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#include "db/blob/blob_log_format.h"
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#include "db/blob/blob_log_writer.h"
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#include "env/mock_env.h"
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#include "file/filename.h"
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#include "file/read_write_util.h"
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#include "file/writable_file_writer.h"
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#include "options/cf_options.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/env.h"
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#include "rocksdb/file_system.h"
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#include "rocksdb/options.h"
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#include "rocksdb/statistics.h"
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#include "test_util/sync_point.h"
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#include "test_util/testharness.h"
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namespace ROCKSDB_NAMESPACE {
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namespace {
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// Creates a test blob file with a single blob in it.
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void WriteBlobFile(uint32_t column_family_id,
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const ImmutableCFOptions& immutable_cf_options,
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uint64_t blob_file_number) {
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assert(!immutable_cf_options.cf_paths.empty());
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const std::string blob_file_path = BlobFileName(
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immutable_cf_options.cf_paths.front().path, blob_file_number);
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std::unique_ptr<FSWritableFile> file;
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ASSERT_OK(NewWritableFile(immutable_cf_options.fs, blob_file_path, &file,
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FileOptions()));
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std::unique_ptr<WritableFileWriter> file_writer(
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new WritableFileWriter(std::move(file), blob_file_path, FileOptions(),
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immutable_cf_options.env->GetSystemClock()));
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constexpr Statistics* statistics = nullptr;
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constexpr bool use_fsync = false;
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constexpr bool do_flush = false;
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BlobLogWriter blob_log_writer(
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std::move(file_writer), immutable_cf_options.env->GetSystemClock(),
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statistics, blob_file_number, use_fsync, do_flush);
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constexpr bool has_ttl = false;
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constexpr ExpirationRange expiration_range;
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BlobLogHeader header(column_family_id, kNoCompression, has_ttl,
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expiration_range);
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ASSERT_OK(blob_log_writer.WriteHeader(header));
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constexpr char key[] = "key";
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constexpr char blob[] = "blob";
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std::string compressed_blob;
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Slice blob_to_write;
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uint64_t key_offset = 0;
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uint64_t blob_offset = 0;
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ASSERT_OK(blob_log_writer.AddRecord(key, blob, &key_offset, &blob_offset));
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BlobLogFooter footer;
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footer.blob_count = 1;
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footer.expiration_range = expiration_range;
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std::string checksum_method;
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std::string checksum_value;
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ASSERT_OK(
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blob_log_writer.AppendFooter(footer, &checksum_method, &checksum_value));
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}
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} // anonymous namespace
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class BlobFileCacheTest : public testing::Test {
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protected:
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BlobFileCacheTest() : mock_env_(Env::Default()) {}
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MockEnv mock_env_;
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};
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TEST_F(BlobFileCacheTest, GetBlobFileReader) {
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Options options;
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options.env = &mock_env_;
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options.statistics = CreateDBStatistics();
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options.cf_paths.emplace_back(
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test::PerThreadDBPath(&mock_env_, "BlobFileCacheTest_GetBlobFileReader"),
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0);
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options.enable_blob_files = true;
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constexpr uint32_t column_family_id = 1;
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ImmutableCFOptions immutable_cf_options(options);
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constexpr uint64_t blob_file_number = 123;
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WriteBlobFile(column_family_id, immutable_cf_options, blob_file_number);
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constexpr size_t capacity = 10;
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std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
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FileOptions file_options;
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constexpr HistogramImpl* blob_file_read_hist = nullptr;
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BlobFileCache blob_file_cache(backing_cache.get(), &immutable_cf_options,
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&file_options, column_family_id,
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blob_file_read_hist);
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// First try: reader should be opened and put in cache
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CacheHandleGuard<BlobFileReader> first;
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ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &first));
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ASSERT_NE(first.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
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// Second try: reader should be served from cache
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CacheHandleGuard<BlobFileReader> second;
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ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &second));
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ASSERT_NE(second.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
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ASSERT_EQ(first.GetValue(), second.GetValue());
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}
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TEST_F(BlobFileCacheTest, GetBlobFileReader_Race) {
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Options options;
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options.env = &mock_env_;
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options.statistics = CreateDBStatistics();
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options.cf_paths.emplace_back(
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test::PerThreadDBPath(&mock_env_,
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"BlobFileCacheTest_GetBlobFileReader_Race"),
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0);
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options.enable_blob_files = true;
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constexpr uint32_t column_family_id = 1;
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ImmutableCFOptions immutable_cf_options(options);
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constexpr uint64_t blob_file_number = 123;
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WriteBlobFile(column_family_id, immutable_cf_options, blob_file_number);
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constexpr size_t capacity = 10;
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std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
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FileOptions file_options;
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constexpr HistogramImpl* blob_file_read_hist = nullptr;
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BlobFileCache blob_file_cache(backing_cache.get(), &immutable_cf_options,
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&file_options, column_family_id,
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blob_file_read_hist);
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CacheHandleGuard<BlobFileReader> first;
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CacheHandleGuard<BlobFileReader> second;
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SyncPoint::GetInstance()->SetCallBack(
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"BlobFileCache::GetBlobFileReader:DoubleCheck", [&](void* /* arg */) {
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// Disabling sync points to prevent infinite recursion
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SyncPoint::GetInstance()->DisableProcessing();
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ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &second));
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ASSERT_NE(second.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
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});
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SyncPoint::GetInstance()->EnableProcessing();
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ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &first));
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ASSERT_NE(first.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
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ASSERT_EQ(first.GetValue(), second.GetValue());
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SyncPoint::GetInstance()->DisableProcessing();
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SyncPoint::GetInstance()->ClearAllCallBacks();
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}
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TEST_F(BlobFileCacheTest, GetBlobFileReader_IOError) {
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Options options;
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options.env = &mock_env_;
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options.statistics = CreateDBStatistics();
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options.cf_paths.emplace_back(
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test::PerThreadDBPath(&mock_env_,
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"BlobFileCacheTest_GetBlobFileReader_IOError"),
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0);
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options.enable_blob_files = true;
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constexpr size_t capacity = 10;
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std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
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ImmutableCFOptions immutable_cf_options(options);
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FileOptions file_options;
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constexpr uint32_t column_family_id = 1;
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constexpr HistogramImpl* blob_file_read_hist = nullptr;
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BlobFileCache blob_file_cache(backing_cache.get(), &immutable_cf_options,
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&file_options, column_family_id,
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blob_file_read_hist);
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// Note: there is no blob file with the below number
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constexpr uint64_t blob_file_number = 123;
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CacheHandleGuard<BlobFileReader> reader;
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ASSERT_TRUE(
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blob_file_cache.GetBlobFileReader(blob_file_number, &reader).IsIOError());
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ASSERT_EQ(reader.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 1);
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}
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TEST_F(BlobFileCacheTest, GetBlobFileReader_CacheFull) {
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Options options;
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options.env = &mock_env_;
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options.statistics = CreateDBStatistics();
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options.cf_paths.emplace_back(
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test::PerThreadDBPath(&mock_env_,
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"BlobFileCacheTest_GetBlobFileReader_CacheFull"),
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0);
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options.enable_blob_files = true;
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constexpr uint32_t column_family_id = 1;
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ImmutableCFOptions immutable_cf_options(options);
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constexpr uint64_t blob_file_number = 123;
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WriteBlobFile(column_family_id, immutable_cf_options, blob_file_number);
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constexpr size_t capacity = 0;
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constexpr int num_shard_bits = -1; // determined automatically
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constexpr bool strict_capacity_limit = true;
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std::shared_ptr<Cache> backing_cache =
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NewLRUCache(capacity, num_shard_bits, strict_capacity_limit);
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FileOptions file_options;
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constexpr HistogramImpl* blob_file_read_hist = nullptr;
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BlobFileCache blob_file_cache(backing_cache.get(), &immutable_cf_options,
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&file_options, column_family_id,
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blob_file_read_hist);
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// Insert into cache should fail since it has zero capacity and
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// strict_capacity_limit is set
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CacheHandleGuard<BlobFileReader> reader;
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ASSERT_TRUE(blob_file_cache.GetBlobFileReader(blob_file_number, &reader)
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.IsIncomplete());
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ASSERT_EQ(reader.GetValue(), nullptr);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
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ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 1);
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}
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} // namespace ROCKSDB_NAMESPACE
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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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