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97 lines
3.2 KiB
97 lines
3.2 KiB
1 year ago
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// 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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//
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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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#pragma once
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#include "db_stress_tool/db_stress_common.h"
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#include "db_stress_tool/db_stress_shared_state.h"
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#include "rocksdb/compaction_filter.h"
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namespace ROCKSDB_NAMESPACE {
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// DbStressCompactionFilter is safe to use with db_stress as it does not perform
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// any mutation. It only makes `kRemove` decisions for keys that are already
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// non-existent according to the `SharedState`.
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class DbStressCompactionFilter : public CompactionFilter {
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public:
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DbStressCompactionFilter(SharedState* state, int cf_id)
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: state_(state), cf_id_(cf_id) {}
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Decision FilterV2(int /*level*/, const Slice& key, ValueType /*value_type*/,
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const Slice& /*existing_value*/, std::string* /*new_value*/,
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std::string* /*skip_until*/) const override {
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if (state_ == nullptr) {
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return Decision::kKeep;
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}
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if (key.empty() || ('0' <= key[0] && key[0] <= '9')) {
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// It is likely leftover from a test_batches_snapshots run. Below this
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// conditional, the test_batches_snapshots key format is not handled
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// properly. Just keep it to be safe.
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return Decision::kKeep;
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}
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uint64_t key_num = 0;
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{
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Slice ukey_without_ts = key;
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assert(ukey_without_ts.size() >= FLAGS_user_timestamp_size);
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ukey_without_ts.remove_suffix(FLAGS_user_timestamp_size);
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[[maybe_unused]] bool ok =
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GetIntVal(ukey_without_ts.ToString(), &key_num);
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assert(ok);
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}
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port::Mutex* key_mutex = state_->GetMutexForKey(cf_id_, key_num);
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if (!key_mutex->TryLock()) {
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return Decision::kKeep;
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}
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// Reaching here means we acquired the lock.
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bool key_exists = state_->Exists(cf_id_, key_num);
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const bool allow_overwrite = state_->AllowsOverwrite(key_num);
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key_mutex->Unlock();
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if (!key_exists) {
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return allow_overwrite ? Decision::kRemove : Decision::kPurge;
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}
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return Decision::kKeep;
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}
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const char* Name() const override { return "DbStressCompactionFilter"; }
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private:
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SharedState* const state_;
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const int cf_id_;
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};
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class DbStressCompactionFilterFactory : public CompactionFilterFactory {
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public:
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DbStressCompactionFilterFactory() : state_(nullptr) {}
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void SetSharedState(SharedState* state) {
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MutexLock state_mutex_guard(&state_mutex_);
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state_ = state;
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}
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std::unique_ptr<CompactionFilter> CreateCompactionFilter(
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const CompactionFilter::Context& context) override {
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MutexLock state_mutex_guard(&state_mutex_);
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return std::unique_ptr<CompactionFilter>(
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new DbStressCompactionFilter(state_, context.column_family_id));
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}
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const char* Name() const override {
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return "DbStressCompactionFilterFactory";
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}
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private:
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port::Mutex state_mutex_;
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SharedState* state_;
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};
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} // namespace ROCKSDB_NAMESPACE
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