mirror of https://github.com/facebook/rocksdb.git
497 lines
19 KiB
C++
497 lines
19 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include <cstdlib>
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#include "db/db_test_util.h"
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#include "port/stack_trace.h"
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namespace rocksdb {
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class DBBlockCacheTest : public DBTestBase {
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private:
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size_t miss_count_ = 0;
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size_t hit_count_ = 0;
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size_t insert_count_ = 0;
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size_t failure_count_ = 0;
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size_t compressed_miss_count_ = 0;
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size_t compressed_hit_count_ = 0;
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size_t compressed_insert_count_ = 0;
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size_t compressed_failure_count_ = 0;
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public:
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const size_t kNumBlocks = 10;
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const size_t kValueSize = 100;
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DBBlockCacheTest() : DBTestBase("/db_block_cache_test") {}
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BlockBasedTableOptions GetTableOptions() {
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BlockBasedTableOptions table_options;
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// Set a small enough block size so that each key-value get its own block.
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table_options.block_size = 1;
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return table_options;
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}
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Options GetOptions(const BlockBasedTableOptions& table_options) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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options.avoid_flush_during_recovery = false;
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// options.compression = kNoCompression;
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options.statistics = rocksdb::CreateDBStatistics();
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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return options;
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}
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void InitTable(const Options& options) {
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std::string value(kValueSize, 'a');
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for (size_t i = 0; i < kNumBlocks; i++) {
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ASSERT_OK(Put(ToString(i), value.c_str()));
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}
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}
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void RecordCacheCounters(const Options& options) {
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miss_count_ = TestGetTickerCount(options, BLOCK_CACHE_MISS);
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hit_count_ = TestGetTickerCount(options, BLOCK_CACHE_HIT);
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insert_count_ = TestGetTickerCount(options, BLOCK_CACHE_ADD);
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failure_count_ = TestGetTickerCount(options, BLOCK_CACHE_ADD_FAILURES);
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compressed_miss_count_ =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS);
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compressed_hit_count_ =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_HIT);
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compressed_insert_count_ =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_ADD);
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compressed_failure_count_ =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_ADD_FAILURES);
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}
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void CheckCacheCounters(const Options& options, size_t expected_misses,
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size_t expected_hits, size_t expected_inserts,
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size_t expected_failures) {
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size_t new_miss_count = TestGetTickerCount(options, BLOCK_CACHE_MISS);
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size_t new_hit_count = TestGetTickerCount(options, BLOCK_CACHE_HIT);
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size_t new_insert_count = TestGetTickerCount(options, BLOCK_CACHE_ADD);
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size_t new_failure_count =
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TestGetTickerCount(options, BLOCK_CACHE_ADD_FAILURES);
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ASSERT_EQ(miss_count_ + expected_misses, new_miss_count);
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ASSERT_EQ(hit_count_ + expected_hits, new_hit_count);
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ASSERT_EQ(insert_count_ + expected_inserts, new_insert_count);
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ASSERT_EQ(failure_count_ + expected_failures, new_failure_count);
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miss_count_ = new_miss_count;
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hit_count_ = new_hit_count;
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insert_count_ = new_insert_count;
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failure_count_ = new_failure_count;
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}
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void CheckCompressedCacheCounters(const Options& options,
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size_t expected_misses,
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size_t expected_hits,
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size_t expected_inserts,
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size_t expected_failures) {
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size_t new_miss_count =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS);
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size_t new_hit_count =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_HIT);
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size_t new_insert_count =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_ADD);
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size_t new_failure_count =
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TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_ADD_FAILURES);
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ASSERT_EQ(compressed_miss_count_ + expected_misses, new_miss_count);
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ASSERT_EQ(compressed_hit_count_ + expected_hits, new_hit_count);
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ASSERT_EQ(compressed_insert_count_ + expected_inserts, new_insert_count);
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ASSERT_EQ(compressed_failure_count_ + expected_failures, new_failure_count);
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compressed_miss_count_ = new_miss_count;
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compressed_hit_count_ = new_hit_count;
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compressed_insert_count_ = new_insert_count;
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compressed_failure_count_ = new_failure_count;
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}
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};
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TEST_F(DBBlockCacheTest, TestWithoutCompressedBlockCache) {
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ReadOptions read_options;
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auto table_options = GetTableOptions();
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auto options = GetOptions(table_options);
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InitTable(options);
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std::shared_ptr<Cache> cache = NewLRUCache(0, 0, false);
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table_options.block_cache = cache;
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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Reopen(options);
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RecordCacheCounters(options);
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std::vector<std::unique_ptr<Iterator>> iterators(kNumBlocks - 1);
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Iterator* iter = nullptr;
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// Load blocks into cache.
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for (size_t i = 0; i < kNumBlocks - 1; i++) {
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(i));
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ASSERT_OK(iter->status());
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CheckCacheCounters(options, 1, 0, 1, 0);
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iterators[i].reset(iter);
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}
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size_t usage = cache->GetUsage();
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ASSERT_LT(0, usage);
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cache->SetCapacity(usage);
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ASSERT_EQ(usage, cache->GetPinnedUsage());
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// Test with strict capacity limit.
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cache->SetStrictCapacityLimit(true);
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(kNumBlocks - 1));
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ASSERT_TRUE(iter->status().IsIncomplete());
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CheckCacheCounters(options, 1, 0, 0, 1);
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delete iter;
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iter = nullptr;
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// Release interators and access cache again.
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for (size_t i = 0; i < kNumBlocks - 1; i++) {
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iterators[i].reset();
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CheckCacheCounters(options, 0, 0, 0, 0);
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}
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ASSERT_EQ(0, cache->GetPinnedUsage());
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for (size_t i = 0; i < kNumBlocks - 1; i++) {
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(i));
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ASSERT_OK(iter->status());
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CheckCacheCounters(options, 0, 1, 0, 0);
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iterators[i].reset(iter);
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}
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}
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#ifdef SNAPPY
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TEST_F(DBBlockCacheTest, TestWithCompressedBlockCache) {
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ReadOptions read_options;
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auto table_options = GetTableOptions();
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auto options = GetOptions(table_options);
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options.compression = CompressionType::kSnappyCompression;
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InitTable(options);
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std::shared_ptr<Cache> cache = NewLRUCache(0, 0, false);
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std::shared_ptr<Cache> compressed_cache = NewLRUCache(0, 0, false);
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table_options.block_cache = cache;
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table_options.block_cache_compressed = compressed_cache;
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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Reopen(options);
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RecordCacheCounters(options);
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std::vector<std::unique_ptr<Iterator>> iterators(kNumBlocks - 1);
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Iterator* iter = nullptr;
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// Load blocks into cache.
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for (size_t i = 0; i < kNumBlocks - 1; i++) {
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(i));
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ASSERT_OK(iter->status());
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CheckCacheCounters(options, 1, 0, 1, 0);
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CheckCompressedCacheCounters(options, 1, 0, 1, 0);
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iterators[i].reset(iter);
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}
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size_t usage = cache->GetUsage();
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ASSERT_LT(0, usage);
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ASSERT_EQ(usage, cache->GetPinnedUsage());
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size_t compressed_usage = compressed_cache->GetUsage();
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ASSERT_LT(0, compressed_usage);
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// Compressed block cache cannot be pinned.
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ASSERT_EQ(0, compressed_cache->GetPinnedUsage());
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// Set strict capacity limit flag. Now block will only load into compressed
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// block cache.
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cache->SetCapacity(usage);
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cache->SetStrictCapacityLimit(true);
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ASSERT_EQ(usage, cache->GetPinnedUsage());
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// compressed_cache->SetCapacity(compressed_usage);
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compressed_cache->SetCapacity(0);
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// compressed_cache->SetStrictCapacityLimit(true);
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(kNumBlocks - 1));
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ASSERT_TRUE(iter->status().IsIncomplete());
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CheckCacheCounters(options, 1, 0, 0, 1);
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CheckCompressedCacheCounters(options, 1, 0, 1, 0);
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delete iter;
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iter = nullptr;
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// Clear strict capacity limit flag. This time we shall hit compressed block
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// cache.
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cache->SetStrictCapacityLimit(false);
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iter = db_->NewIterator(read_options);
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iter->Seek(ToString(kNumBlocks - 1));
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ASSERT_OK(iter->status());
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CheckCacheCounters(options, 1, 0, 1, 0);
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CheckCompressedCacheCounters(options, 0, 1, 0, 0);
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delete iter;
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iter = nullptr;
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}
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#endif // SNAPPY
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#ifndef ROCKSDB_LITE
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// Make sure that when options.block_cache is set, after a new table is
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// created its index/filter blocks are added to block cache.
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TEST_F(DBBlockCacheTest, IndexAndFilterBlocksOfNewTableAddedToCache) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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options.statistics = rocksdb::CreateDBStatistics();
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BlockBasedTableOptions table_options;
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table_options.cache_index_and_filter_blocks = true;
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table_options.filter_policy.reset(NewBloomFilterPolicy(20));
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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CreateAndReopenWithCF({"pikachu"}, options);
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ASSERT_OK(Put(1, "key", "val"));
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// Create a new table.
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ASSERT_OK(Flush(1));
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// index/filter blocks added to block cache right after table creation.
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_INDEX_MISS));
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_FILTER_MISS));
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ASSERT_EQ(2, /* only index/filter were added */
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TestGetTickerCount(options, BLOCK_CACHE_ADD));
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ASSERT_EQ(0, TestGetTickerCount(options, BLOCK_CACHE_DATA_MISS));
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uint64_t int_num;
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ASSERT_TRUE(
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dbfull()->GetIntProperty("rocksdb.estimate-table-readers-mem", &int_num));
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ASSERT_EQ(int_num, 0U);
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// Make sure filter block is in cache.
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std::string value;
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ReadOptions ropt;
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db_->KeyMayExist(ReadOptions(), handles_[1], "key", &value);
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// Miss count should remain the same.
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_FILTER_MISS));
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_FILTER_HIT));
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db_->KeyMayExist(ReadOptions(), handles_[1], "key", &value);
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_FILTER_MISS));
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ASSERT_EQ(2, TestGetTickerCount(options, BLOCK_CACHE_FILTER_HIT));
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// Make sure index block is in cache.
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auto index_block_hit = TestGetTickerCount(options, BLOCK_CACHE_INDEX_HIT);
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value = Get(1, "key");
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_INDEX_MISS));
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ASSERT_EQ(index_block_hit + 1,
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TestGetTickerCount(options, BLOCK_CACHE_INDEX_HIT));
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value = Get(1, "key");
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ASSERT_EQ(1, TestGetTickerCount(options, BLOCK_CACHE_INDEX_MISS));
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ASSERT_EQ(index_block_hit + 2,
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TestGetTickerCount(options, BLOCK_CACHE_INDEX_HIT));
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}
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TEST_F(DBBlockCacheTest, IndexAndFilterBlocksStats) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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options.statistics = rocksdb::CreateDBStatistics();
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BlockBasedTableOptions table_options;
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table_options.cache_index_and_filter_blocks = true;
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// 200 bytes are enough to hold the first two blocks
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std::shared_ptr<Cache> cache = NewLRUCache(200, 0, false);
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table_options.block_cache = cache;
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table_options.filter_policy.reset(NewBloomFilterPolicy(20));
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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CreateAndReopenWithCF({"pikachu"}, options);
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ASSERT_OK(Put(1, "key", "val"));
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// Create a new table
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ASSERT_OK(Flush(1));
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size_t index_bytes_insert =
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TestGetTickerCount(options, BLOCK_CACHE_INDEX_BYTES_INSERT);
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size_t filter_bytes_insert =
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TestGetTickerCount(options, BLOCK_CACHE_FILTER_BYTES_INSERT);
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ASSERT_GT(index_bytes_insert, 0);
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ASSERT_GT(filter_bytes_insert, 0);
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ASSERT_EQ(cache->GetUsage(), index_bytes_insert + filter_bytes_insert);
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// set the cache capacity to the current usage
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cache->SetCapacity(index_bytes_insert + filter_bytes_insert);
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ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_INDEX_BYTES_EVICT), 0);
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ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_FILTER_BYTES_EVICT), 0);
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ASSERT_OK(Put(1, "key2", "val"));
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// Create a new table
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ASSERT_OK(Flush(1));
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// cache evicted old index and block entries
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ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_INDEX_BYTES_INSERT),
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index_bytes_insert);
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ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_FILTER_BYTES_INSERT),
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filter_bytes_insert);
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ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_INDEX_BYTES_EVICT),
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index_bytes_insert);
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ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_FILTER_BYTES_EVICT),
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filter_bytes_insert);
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}
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TEST_F(DBBlockCacheTest, ParanoidFileChecks) {
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Options options = CurrentOptions();
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options.create_if_missing = true;
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options.statistics = rocksdb::CreateDBStatistics();
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options.level0_file_num_compaction_trigger = 2;
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options.paranoid_file_checks = true;
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BlockBasedTableOptions table_options;
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table_options.cache_index_and_filter_blocks = false;
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table_options.filter_policy.reset(NewBloomFilterPolicy(20));
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options.table_factory.reset(new BlockBasedTableFactory(table_options));
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CreateAndReopenWithCF({"pikachu"}, options);
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ASSERT_OK(Put(1, "1_key", "val"));
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ASSERT_OK(Put(1, "9_key", "val"));
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// Create a new table.
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ASSERT_OK(Flush(1));
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ASSERT_EQ(1, /* read and cache data block */
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TestGetTickerCount(options, BLOCK_CACHE_ADD));
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ASSERT_OK(Put(1, "1_key2", "val2"));
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ASSERT_OK(Put(1, "9_key2", "val2"));
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// Create a new SST file. This will further trigger a compaction
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// and generate another file.
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ASSERT_OK(Flush(1));
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dbfull()->TEST_WaitForCompact();
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ASSERT_EQ(3, /* Totally 3 files created up to now */
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TestGetTickerCount(options, BLOCK_CACHE_ADD));
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// After disabling options.paranoid_file_checks. NO further block
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// is added after generating a new file.
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ASSERT_OK(
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dbfull()->SetOptions(handles_[1], {{"paranoid_file_checks", "false"}}));
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ASSERT_OK(Put(1, "1_key3", "val3"));
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ASSERT_OK(Put(1, "9_key3", "val3"));
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ASSERT_OK(Flush(1));
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ASSERT_OK(Put(1, "1_key4", "val4"));
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ASSERT_OK(Put(1, "9_key4", "val4"));
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ASSERT_OK(Flush(1));
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dbfull()->TEST_WaitForCompact();
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ASSERT_EQ(3, /* Totally 3 files created up to now */
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TestGetTickerCount(options, BLOCK_CACHE_ADD));
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}
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TEST_F(DBBlockCacheTest, CompressedCache) {
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if (!Snappy_Supported()) {
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return;
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}
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int num_iter = 80;
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// Run this test three iterations.
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// Iteration 1: only a uncompressed block cache
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// Iteration 2: only a compressed block cache
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// Iteration 3: both block cache and compressed cache
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// Iteration 4: both block cache and compressed cache, but DB is not
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// compressed
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for (int iter = 0; iter < 4; iter++) {
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Options options = CurrentOptions();
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options.write_buffer_size = 64 * 1024; // small write buffer
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options.statistics = rocksdb::CreateDBStatistics();
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BlockBasedTableOptions table_options;
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switch (iter) {
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case 0:
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// only uncompressed block cache
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table_options.block_cache = NewLRUCache(8 * 1024);
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table_options.block_cache_compressed = nullptr;
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options.table_factory.reset(NewBlockBasedTableFactory(table_options));
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break;
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case 1:
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// no block cache, only compressed cache
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table_options.no_block_cache = true;
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table_options.block_cache = nullptr;
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table_options.block_cache_compressed = NewLRUCache(8 * 1024);
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options.table_factory.reset(NewBlockBasedTableFactory(table_options));
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break;
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case 2:
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// both compressed and uncompressed block cache
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table_options.block_cache = NewLRUCache(1024);
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table_options.block_cache_compressed = NewLRUCache(8 * 1024);
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options.table_factory.reset(NewBlockBasedTableFactory(table_options));
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break;
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case 3:
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// both block cache and compressed cache, but DB is not compressed
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// also, make block cache sizes bigger, to trigger block cache hits
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table_options.block_cache = NewLRUCache(1024 * 1024);
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table_options.block_cache_compressed = NewLRUCache(8 * 1024 * 1024);
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options.table_factory.reset(NewBlockBasedTableFactory(table_options));
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options.compression = kNoCompression;
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break;
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default:
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ASSERT_TRUE(false);
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}
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CreateAndReopenWithCF({"pikachu"}, options);
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// default column family doesn't have block cache
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Options no_block_cache_opts;
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no_block_cache_opts.statistics = options.statistics;
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no_block_cache_opts = CurrentOptions(no_block_cache_opts);
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BlockBasedTableOptions table_options_no_bc;
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table_options_no_bc.no_block_cache = true;
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no_block_cache_opts.table_factory.reset(
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NewBlockBasedTableFactory(table_options_no_bc));
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ReopenWithColumnFamilies(
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{"default", "pikachu"},
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std::vector<Options>({no_block_cache_opts, options}));
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Random rnd(301);
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// Write 8MB (80 values, each 100K)
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ASSERT_EQ(NumTableFilesAtLevel(0, 1), 0);
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std::vector<std::string> values;
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std::string str;
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for (int i = 0; i < num_iter; i++) {
|
|
if (i % 4 == 0) { // high compression ratio
|
|
str = RandomString(&rnd, 1000);
|
|
}
|
|
values.push_back(str);
|
|
ASSERT_OK(Put(1, Key(i), values[i]));
|
|
}
|
|
|
|
// flush all data from memtable so that reads are from block cache
|
|
ASSERT_OK(Flush(1));
|
|
|
|
for (int i = 0; i < num_iter; i++) {
|
|
ASSERT_EQ(Get(1, Key(i)), values[i]);
|
|
}
|
|
|
|
// check that we triggered the appropriate code paths in the cache
|
|
switch (iter) {
|
|
case 0:
|
|
// only uncompressed block cache
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_MISS), 0);
|
|
ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS), 0);
|
|
break;
|
|
case 1:
|
|
// no block cache, only compressed cache
|
|
ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_MISS), 0);
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS), 0);
|
|
break;
|
|
case 2:
|
|
// both compressed and uncompressed block cache
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_MISS), 0);
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS), 0);
|
|
break;
|
|
case 3:
|
|
// both compressed and uncompressed block cache
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_MISS), 0);
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_HIT), 0);
|
|
ASSERT_GT(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_MISS), 0);
|
|
// compressed doesn't have any hits since blocks are not compressed on
|
|
// storage
|
|
ASSERT_EQ(TestGetTickerCount(options, BLOCK_CACHE_COMPRESSED_HIT), 0);
|
|
break;
|
|
default:
|
|
ASSERT_TRUE(false);
|
|
}
|
|
|
|
options.create_if_missing = true;
|
|
DestroyAndReopen(options);
|
|
}
|
|
}
|
|
|
|
#endif // ROCKSDB_LITE
|
|
|
|
} // namespace rocksdb
|
|
|
|
int main(int argc, char** argv) {
|
|
rocksdb::port::InstallStackTraceHandler();
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
return RUN_ALL_TESTS();
|
|
}
|