mirror of https://github.com/facebook/rocksdb.git
756 lines
23 KiB
C++
756 lines
23 KiB
C++
// Copyright (c) 2013, 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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#pragma once
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <fcntl.h>
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#include <inttypes.h>
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#ifndef OS_WIN
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#include <unistd.h>
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#endif
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#include <algorithm>
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#include <set>
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#include <string>
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#include <thread>
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#include <unordered_set>
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#include <utility>
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#include <vector>
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#include "db/db_impl.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "memtable/hash_linklist_rep.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/compaction_filter.h"
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#include "rocksdb/convenience.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/filter_policy.h"
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#include "rocksdb/options.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/table.h"
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#include "rocksdb/utilities/checkpoint.h"
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#include "table/block_based_table_factory.h"
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#include "table/mock_table.h"
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#include "table/plain_table_factory.h"
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#include "table/scoped_arena_iterator.h"
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#include "util/compression.h"
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#include "util/mock_env.h"
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#include "util/mutexlock.h"
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#include "util/string_util.h"
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// SyncPoint is not supported in Released Windows Mode.
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#if !(defined NDEBUG) || !defined(OS_WIN)
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#include "util/sync_point.h"
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#endif // !(defined NDEBUG) || !defined(OS_WIN)
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#include "util/testharness.h"
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#include "util/testutil.h"
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#include "util/xfunc.h"
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#include "utilities/merge_operators.h"
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namespace rocksdb {
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namespace anon {
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class AtomicCounter {
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public:
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explicit AtomicCounter(Env* env = NULL)
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: env_(env), cond_count_(&mu_), count_(0) {}
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void Increment() {
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MutexLock l(&mu_);
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count_++;
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cond_count_.SignalAll();
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}
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int Read() {
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MutexLock l(&mu_);
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return count_;
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}
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bool WaitFor(int count) {
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MutexLock l(&mu_);
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uint64_t start = env_->NowMicros();
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while (count_ < count) {
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uint64_t now = env_->NowMicros();
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cond_count_.TimedWait(now + /*1s*/ 1 * 1000 * 1000);
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if (env_->NowMicros() - start > /*10s*/ 10 * 1000 * 1000) {
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return false;
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}
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if (count_ < count) {
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GTEST_LOG_(WARNING) << "WaitFor is taking more time than usual";
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}
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}
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return true;
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}
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void Reset() {
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MutexLock l(&mu_);
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count_ = 0;
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cond_count_.SignalAll();
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}
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private:
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Env* env_;
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port::Mutex mu_;
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port::CondVar cond_count_;
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int count_;
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};
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struct OptionsOverride {
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std::shared_ptr<const FilterPolicy> filter_policy = nullptr;
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// Used as a bit mask of individual enums in which to skip an XF test point
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int skip_policy = 0;
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};
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} // namespace anon
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// A hacky skip list mem table that triggers flush after number of entries.
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class SpecialMemTableRep : public MemTableRep {
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public:
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explicit SpecialMemTableRep(MemTableAllocator* allocator,
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MemTableRep* memtable, int num_entries_flush)
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: MemTableRep(allocator),
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memtable_(memtable),
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num_entries_flush_(num_entries_flush),
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num_entries_(0) {}
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virtual KeyHandle Allocate(const size_t len, char** buf) override {
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return memtable_->Allocate(len, buf);
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}
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// Insert key into the list.
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// REQUIRES: nothing that compares equal to key is currently in the list.
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virtual void Insert(KeyHandle handle) override {
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memtable_->Insert(handle);
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num_entries_++;
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}
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// Returns true iff an entry that compares equal to key is in the list.
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virtual bool Contains(const char* key) const override {
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return memtable_->Contains(key);
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}
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virtual size_t ApproximateMemoryUsage() override {
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// Return a high memory usage when number of entries exceeds the threshold
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// to trigger a flush.
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return (num_entries_ < num_entries_flush_) ? 0 : 1024 * 1024 * 1024;
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}
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virtual void Get(const LookupKey& k, void* callback_args,
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bool (*callback_func)(void* arg,
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const char* entry)) override {
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memtable_->Get(k, callback_args, callback_func);
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}
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uint64_t ApproximateNumEntries(const Slice& start_ikey,
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const Slice& end_ikey) override {
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return memtable_->ApproximateNumEntries(start_ikey, end_ikey);
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}
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virtual MemTableRep::Iterator* GetIterator(Arena* arena = nullptr) override {
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return memtable_->GetIterator(arena);
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}
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virtual ~SpecialMemTableRep() override {}
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private:
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unique_ptr<MemTableRep> memtable_;
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int num_entries_flush_;
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int num_entries_;
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};
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// The factory for the hacky skip list mem table that triggers flush after
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// number of entries exceeds a threshold.
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class SpecialSkipListFactory : public MemTableRepFactory {
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public:
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// After number of inserts exceeds `num_entries_flush` in a mem table, trigger
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// flush.
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explicit SpecialSkipListFactory(int num_entries_flush)
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: num_entries_flush_(num_entries_flush) {}
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virtual MemTableRep* CreateMemTableRep(
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const MemTableRep::KeyComparator& compare, MemTableAllocator* allocator,
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const SliceTransform* transform, Logger* logger) override {
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return new SpecialMemTableRep(
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allocator, factory_.CreateMemTableRep(compare, allocator, transform, 0),
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num_entries_flush_);
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}
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virtual const char* Name() const override { return "SkipListFactory"; }
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private:
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SkipListFactory factory_;
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int num_entries_flush_;
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};
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// Special Env used to delay background operations
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class SpecialEnv : public EnvWrapper {
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public:
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explicit SpecialEnv(Env* base);
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Status NewWritableFile(const std::string& f, unique_ptr<WritableFile>* r,
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const EnvOptions& soptions) override {
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class SSTableFile : public WritableFile {
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private:
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SpecialEnv* env_;
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unique_ptr<WritableFile> base_;
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public:
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SSTableFile(SpecialEnv* env, unique_ptr<WritableFile>&& base)
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: env_(env), base_(std::move(base)) {}
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Status Append(const Slice& data) override {
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if (env_->table_write_callback_) {
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(*env_->table_write_callback_)();
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}
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if (env_->drop_writes_.load(std::memory_order_acquire)) {
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// Drop writes on the floor
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return Status::OK();
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} else if (env_->no_space_.load(std::memory_order_acquire)) {
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return Status::IOError("No space left on device");
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} else {
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env_->bytes_written_ += data.size();
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return base_->Append(data);
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}
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}
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Status Truncate(uint64_t size) override { return base_->Truncate(size); }
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Status Close() override {
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// SyncPoint is not supported in Released Windows Mode.
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#if !(defined NDEBUG) || !defined(OS_WIN)
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// Check preallocation size
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// preallocation size is never passed to base file.
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size_t preallocation_size = preallocation_block_size();
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TEST_SYNC_POINT_CALLBACK("DBTestWritableFile.GetPreallocationStatus",
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&preallocation_size);
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#endif // !(defined NDEBUG) || !defined(OS_WIN)
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return base_->Close();
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}
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Status Flush() override { return base_->Flush(); }
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Status Sync() override {
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++env_->sync_counter_;
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while (env_->delay_sstable_sync_.load(std::memory_order_acquire)) {
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env_->SleepForMicroseconds(100000);
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}
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return base_->Sync();
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}
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void SetIOPriority(Env::IOPriority pri) override {
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base_->SetIOPriority(pri);
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}
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Env::IOPriority GetIOPriority() override {
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return base_->GetIOPriority();
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}
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};
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class ManifestFile : public WritableFile {
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public:
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ManifestFile(SpecialEnv* env, unique_ptr<WritableFile>&& b)
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: env_(env), base_(std::move(b)) {}
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Status Append(const Slice& data) override {
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if (env_->manifest_write_error_.load(std::memory_order_acquire)) {
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return Status::IOError("simulated writer error");
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} else {
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return base_->Append(data);
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}
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}
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Status Truncate(uint64_t size) override { return base_->Truncate(size); }
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Status Close() override { return base_->Close(); }
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Status Flush() override { return base_->Flush(); }
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Status Sync() override {
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++env_->sync_counter_;
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if (env_->manifest_sync_error_.load(std::memory_order_acquire)) {
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return Status::IOError("simulated sync error");
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} else {
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return base_->Sync();
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}
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}
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uint64_t GetFileSize() override { return base_->GetFileSize(); }
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private:
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SpecialEnv* env_;
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unique_ptr<WritableFile> base_;
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};
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class WalFile : public WritableFile {
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public:
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WalFile(SpecialEnv* env, unique_ptr<WritableFile>&& b)
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: env_(env), base_(std::move(b)) {}
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Status Append(const Slice& data) override {
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#if !(defined NDEBUG) || !defined(OS_WIN)
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TEST_SYNC_POINT("SpecialEnv::WalFile::Append:1");
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#endif
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Status s;
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if (env_->log_write_error_.load(std::memory_order_acquire)) {
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s = Status::IOError("simulated writer error");
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} else {
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int slowdown =
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env_->log_write_slowdown_.load(std::memory_order_acquire);
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if (slowdown > 0) {
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env_->SleepForMicroseconds(slowdown);
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}
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s = base_->Append(data);
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}
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#if !(defined NDEBUG) || !defined(OS_WIN)
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TEST_SYNC_POINT("SpecialEnv::WalFile::Append:2");
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#endif
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return s;
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}
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Status Truncate(uint64_t size) override { return base_->Truncate(size); }
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Status Close() override { return base_->Close(); }
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Status Flush() override { return base_->Flush(); }
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Status Sync() override {
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++env_->sync_counter_;
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return base_->Sync();
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}
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bool IsSyncThreadSafe() const override {
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return env_->is_wal_sync_thread_safe_.load();
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}
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private:
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SpecialEnv* env_;
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unique_ptr<WritableFile> base_;
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};
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if (non_writeable_rate_.load(std::memory_order_acquire) > 0) {
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uint32_t random_number;
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{
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MutexLock l(&rnd_mutex_);
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random_number = rnd_.Uniform(100);
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}
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if (random_number < non_writeable_rate_.load()) {
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return Status::IOError("simulated random write error");
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}
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}
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new_writable_count_++;
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if (non_writable_count_.load() > 0) {
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non_writable_count_--;
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return Status::IOError("simulated write error");
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}
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Status s = target()->NewWritableFile(f, r, soptions);
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if (s.ok()) {
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if (strstr(f.c_str(), ".sst") != nullptr) {
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r->reset(new SSTableFile(this, std::move(*r)));
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} else if (strstr(f.c_str(), "MANIFEST") != nullptr) {
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r->reset(new ManifestFile(this, std::move(*r)));
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} else if (strstr(f.c_str(), "log") != nullptr) {
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r->reset(new WalFile(this, std::move(*r)));
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}
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}
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return s;
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}
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Status NewRandomAccessFile(const std::string& f,
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unique_ptr<RandomAccessFile>* r,
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const EnvOptions& soptions) override {
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class CountingFile : public RandomAccessFile {
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public:
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CountingFile(unique_ptr<RandomAccessFile>&& target,
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anon::AtomicCounter* counter)
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: target_(std::move(target)), counter_(counter) {}
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virtual Status Read(uint64_t offset, size_t n, Slice* result,
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char* scratch) const override {
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counter_->Increment();
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return target_->Read(offset, n, result, scratch);
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}
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private:
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unique_ptr<RandomAccessFile> target_;
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anon::AtomicCounter* counter_;
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};
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Status s = target()->NewRandomAccessFile(f, r, soptions);
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random_file_open_counter_++;
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if (s.ok() && count_random_reads_) {
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r->reset(new CountingFile(std::move(*r), &random_read_counter_));
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}
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return s;
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}
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Status NewSequentialFile(const std::string& f, unique_ptr<SequentialFile>* r,
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const EnvOptions& soptions) override {
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class CountingFile : public SequentialFile {
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public:
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CountingFile(unique_ptr<SequentialFile>&& target,
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anon::AtomicCounter* counter)
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: target_(std::move(target)), counter_(counter) {}
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virtual Status Read(size_t n, Slice* result, char* scratch) override {
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counter_->Increment();
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return target_->Read(n, result, scratch);
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}
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virtual Status Skip(uint64_t n) override { return target_->Skip(n); }
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private:
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unique_ptr<SequentialFile> target_;
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anon::AtomicCounter* counter_;
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};
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Status s = target()->NewSequentialFile(f, r, soptions);
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if (s.ok() && count_sequential_reads_) {
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r->reset(new CountingFile(std::move(*r), &sequential_read_counter_));
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}
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return s;
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}
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virtual void SleepForMicroseconds(int micros) override {
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sleep_counter_.Increment();
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if (no_sleep_ || time_elapse_only_sleep_) {
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addon_time_.fetch_add(micros);
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}
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if (!no_sleep_) {
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target()->SleepForMicroseconds(micros);
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}
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}
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virtual Status GetCurrentTime(int64_t* unix_time) override {
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Status s;
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if (!time_elapse_only_sleep_) {
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s = target()->GetCurrentTime(unix_time);
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}
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if (s.ok()) {
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*unix_time += addon_time_.load();
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}
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return s;
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}
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virtual uint64_t NowNanos() override {
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return (time_elapse_only_sleep_ ? 0 : target()->NowNanos()) +
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addon_time_.load() * 1000;
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}
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virtual uint64_t NowMicros() override {
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return (time_elapse_only_sleep_ ? 0 : target()->NowMicros()) +
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addon_time_.load();
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}
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Random rnd_;
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port::Mutex rnd_mutex_; // Lock to pretect rnd_
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// sstable Sync() calls are blocked while this pointer is non-nullptr.
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std::atomic<bool> delay_sstable_sync_;
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// Drop writes on the floor while this pointer is non-nullptr.
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std::atomic<bool> drop_writes_;
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// Simulate no-space errors while this pointer is non-nullptr.
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std::atomic<bool> no_space_;
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// Simulate non-writable file system while this pointer is non-nullptr
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std::atomic<bool> non_writable_;
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// Force sync of manifest files to fail while this pointer is non-nullptr
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std::atomic<bool> manifest_sync_error_;
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// Force write to manifest files to fail while this pointer is non-nullptr
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std::atomic<bool> manifest_write_error_;
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// Force write to log files to fail while this pointer is non-nullptr
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std::atomic<bool> log_write_error_;
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// Slow down every log write, in micro-seconds.
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std::atomic<int> log_write_slowdown_;
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bool count_random_reads_;
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anon::AtomicCounter random_read_counter_;
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std::atomic<int> random_file_open_counter_;
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bool count_sequential_reads_;
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anon::AtomicCounter sequential_read_counter_;
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anon::AtomicCounter sleep_counter_;
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std::atomic<int64_t> bytes_written_;
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std::atomic<int> sync_counter_;
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std::atomic<uint32_t> non_writeable_rate_;
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std::atomic<uint32_t> new_writable_count_;
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std::atomic<uint32_t> non_writable_count_;
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std::function<void()>* table_write_callback_;
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std::atomic<int64_t> addon_time_;
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bool time_elapse_only_sleep_;
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bool no_sleep_;
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std::atomic<bool> is_wal_sync_thread_safe_{true};
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};
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class DBTestBase : public testing::Test {
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protected:
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// Sequence of option configurations to try
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enum OptionConfig {
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kDefault = 0,
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kBlockBasedTableWithPrefixHashIndex = 1,
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kBlockBasedTableWithWholeKeyHashIndex = 2,
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kPlainTableFirstBytePrefix = 3,
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kPlainTableCappedPrefix = 4,
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kPlainTableCappedPrefixNonMmap = 5,
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kPlainTableAllBytesPrefix = 6,
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kVectorRep = 7,
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kHashLinkList = 8,
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kHashCuckoo = 9,
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kMergePut = 10,
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kFilter = 11,
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kFullFilterWithNewTableReaderForCompactions = 12,
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kUncompressed = 13,
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kNumLevel_3 = 14,
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kDBLogDir = 15,
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kWalDirAndMmapReads = 16,
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kManifestFileSize = 17,
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kPerfOptions = 18,
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kDeletesFilterFirst = 19,
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kHashSkipList = 20,
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kUniversalCompaction = 21,
|
|
kUniversalCompactionMultiLevel = 22,
|
|
kCompressedBlockCache = 23,
|
|
kInfiniteMaxOpenFiles = 24,
|
|
kxxHashChecksum = 25,
|
|
kFIFOCompaction = 26,
|
|
kOptimizeFiltersForHits = 27,
|
|
kRowCache = 28,
|
|
kRecycleLogFiles = 29,
|
|
kLevelSubcompactions = 30,
|
|
kUniversalSubcompactions = 31,
|
|
kEnd = 30
|
|
};
|
|
int option_config_;
|
|
|
|
public:
|
|
std::string dbname_;
|
|
std::string alternative_wal_dir_;
|
|
std::string alternative_db_log_dir_;
|
|
MockEnv* mem_env_;
|
|
SpecialEnv* env_;
|
|
DB* db_;
|
|
std::vector<ColumnFamilyHandle*> handles_;
|
|
|
|
Options last_options_;
|
|
|
|
// Skip some options, as they may not be applicable to a specific test.
|
|
// To add more skip constants, use values 4, 8, 16, etc.
|
|
enum OptionSkip {
|
|
kNoSkip = 0,
|
|
kSkipDeletesFilterFirst = 1,
|
|
kSkipUniversalCompaction = 2,
|
|
kSkipMergePut = 4,
|
|
kSkipPlainTable = 8,
|
|
kSkipHashIndex = 16,
|
|
kSkipNoSeekToLast = 32,
|
|
kSkipHashCuckoo = 64,
|
|
kSkipFIFOCompaction = 128,
|
|
kSkipMmapReads = 256,
|
|
};
|
|
|
|
explicit DBTestBase(const std::string path);
|
|
|
|
~DBTestBase();
|
|
|
|
static std::string RandomString(Random* rnd, int len) {
|
|
std::string r;
|
|
test::RandomString(rnd, len, &r);
|
|
return r;
|
|
}
|
|
|
|
static std::string Key(int i) {
|
|
char buf[100];
|
|
snprintf(buf, sizeof(buf), "key%06d", i);
|
|
return std::string(buf);
|
|
}
|
|
|
|
static bool ShouldSkipOptions(int option_config, int skip_mask = kNoSkip);
|
|
|
|
// Switch to a fresh database with the next option configuration to
|
|
// test. Return false if there are no more configurations to test.
|
|
bool ChangeOptions(int skip_mask = kNoSkip);
|
|
|
|
// Switch between different compaction styles (we have only 2 now).
|
|
bool ChangeCompactOptions();
|
|
|
|
// Switch between different filter policy
|
|
// Jump from kDefault to kFilter to kFullFilter
|
|
bool ChangeFilterOptions();
|
|
|
|
// Return the current option configuration.
|
|
Options CurrentOptions(
|
|
const anon::OptionsOverride& options_override = anon::OptionsOverride());
|
|
|
|
Options CurrentOptions(
|
|
const Options& defaultOptions,
|
|
const anon::OptionsOverride& options_override = anon::OptionsOverride());
|
|
|
|
DBImpl* dbfull() { return reinterpret_cast<DBImpl*>(db_); }
|
|
|
|
void CreateColumnFamilies(const std::vector<std::string>& cfs,
|
|
const Options& options);
|
|
|
|
void CreateAndReopenWithCF(const std::vector<std::string>& cfs,
|
|
const Options& options);
|
|
|
|
void ReopenWithColumnFamilies(const std::vector<std::string>& cfs,
|
|
const std::vector<Options>& options);
|
|
|
|
void ReopenWithColumnFamilies(const std::vector<std::string>& cfs,
|
|
const Options& options);
|
|
|
|
Status TryReopenWithColumnFamilies(const std::vector<std::string>& cfs,
|
|
const std::vector<Options>& options);
|
|
|
|
Status TryReopenWithColumnFamilies(const std::vector<std::string>& cfs,
|
|
const Options& options);
|
|
|
|
void Reopen(const Options& options);
|
|
|
|
void Close();
|
|
|
|
void DestroyAndReopen(const Options& options);
|
|
|
|
void Destroy(const Options& options);
|
|
|
|
Status ReadOnlyReopen(const Options& options);
|
|
|
|
Status TryReopen(const Options& options);
|
|
|
|
Status Flush(int cf = 0);
|
|
|
|
Status Put(const Slice& k, const Slice& v, WriteOptions wo = WriteOptions());
|
|
|
|
Status Put(int cf, const Slice& k, const Slice& v,
|
|
WriteOptions wo = WriteOptions());
|
|
|
|
Status Delete(const std::string& k);
|
|
|
|
Status Delete(int cf, const std::string& k);
|
|
|
|
Status SingleDelete(const std::string& k);
|
|
|
|
Status SingleDelete(int cf, const std::string& k);
|
|
|
|
std::string Get(const std::string& k, const Snapshot* snapshot = nullptr);
|
|
|
|
std::string Get(int cf, const std::string& k,
|
|
const Snapshot* snapshot = nullptr);
|
|
|
|
uint64_t GetNumSnapshots();
|
|
|
|
uint64_t GetTimeOldestSnapshots();
|
|
|
|
// Return a string that contains all key,value pairs in order,
|
|
// formatted like "(k1->v1)(k2->v2)".
|
|
std::string Contents(int cf = 0);
|
|
|
|
std::string AllEntriesFor(const Slice& user_key, int cf = 0);
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
int NumSortedRuns(int cf = 0);
|
|
|
|
uint64_t TotalSize(int cf = 0);
|
|
|
|
uint64_t SizeAtLevel(int level);
|
|
|
|
size_t TotalLiveFiles(int cf = 0);
|
|
|
|
size_t CountLiveFiles();
|
|
#endif // ROCKSDB_LITE
|
|
|
|
int NumTableFilesAtLevel(int level, int cf = 0);
|
|
|
|
int TotalTableFiles(int cf = 0, int levels = -1);
|
|
|
|
// Return spread of files per level
|
|
std::string FilesPerLevel(int cf = 0);
|
|
|
|
size_t CountFiles();
|
|
|
|
uint64_t Size(const Slice& start, const Slice& limit, int cf = 0);
|
|
|
|
void Compact(int cf, const Slice& start, const Slice& limit,
|
|
uint32_t target_path_id);
|
|
|
|
void Compact(int cf, const Slice& start, const Slice& limit);
|
|
|
|
void Compact(const Slice& start, const Slice& limit);
|
|
|
|
// Do n memtable compactions, each of which produces an sstable
|
|
// covering the range [small,large].
|
|
void MakeTables(int n, const std::string& small, const std::string& large,
|
|
int cf = 0);
|
|
|
|
// Prevent pushing of new sstables into deeper levels by adding
|
|
// tables that cover a specified range to all levels.
|
|
void FillLevels(const std::string& smallest, const std::string& largest,
|
|
int cf);
|
|
|
|
void MoveFilesToLevel(int level, int cf = 0);
|
|
|
|
void DumpFileCounts(const char* label);
|
|
|
|
std::string DumpSSTableList();
|
|
|
|
void GetSstFiles(std::string path, std::vector<std::string>* files);
|
|
|
|
int GetSstFileCount(std::string path);
|
|
|
|
// this will generate non-overlapping files since it keeps increasing key_idx
|
|
void GenerateNewFile(Random* rnd, int* key_idx, bool nowait = false);
|
|
|
|
void GenerateNewFile(int fd, Random* rnd, int* key_idx, bool nowait = false);
|
|
|
|
static const int kNumKeysByGenerateNewRandomFile;
|
|
static const int KNumKeysByGenerateNewFile = 100;
|
|
|
|
void GenerateNewRandomFile(Random* rnd, bool nowait = false);
|
|
|
|
std::string IterStatus(Iterator* iter);
|
|
|
|
Options OptionsForLogIterTest();
|
|
|
|
std::string DummyString(size_t len, char c = 'a');
|
|
|
|
void VerifyIterLast(std::string expected_key, int cf = 0);
|
|
|
|
// Used to test InplaceUpdate
|
|
|
|
// If previous value is nullptr or delta is > than previous value,
|
|
// sets newValue with delta
|
|
// If previous value is not empty,
|
|
// updates previous value with 'b' string of previous value size - 1.
|
|
static UpdateStatus updateInPlaceSmallerSize(char* prevValue,
|
|
uint32_t* prevSize, Slice delta,
|
|
std::string* newValue);
|
|
|
|
static UpdateStatus updateInPlaceSmallerVarintSize(char* prevValue,
|
|
uint32_t* prevSize,
|
|
Slice delta,
|
|
std::string* newValue);
|
|
|
|
static UpdateStatus updateInPlaceLargerSize(char* prevValue,
|
|
uint32_t* prevSize, Slice delta,
|
|
std::string* newValue);
|
|
|
|
static UpdateStatus updateInPlaceNoAction(char* prevValue, uint32_t* prevSize,
|
|
Slice delta, std::string* newValue);
|
|
|
|
// Utility method to test InplaceUpdate
|
|
void validateNumberOfEntries(int numValues, int cf = 0);
|
|
|
|
void CopyFile(const std::string& source, const std::string& destination,
|
|
uint64_t size = 0);
|
|
};
|
|
|
|
} // namespace rocksdb
|