rocksdb/util/db_test_util.h
Andres Noetzli 014fd55adc Support for SingleDelete()
Summary:
This patch fixes #7460559. It introduces SingleDelete as a new database
operation. This operation can be used to delete keys that were never
overwritten (no put following another put of the same key). If an overwritten
key is single deleted the behavior is undefined. Single deletion of a
non-existent key has no effect but multiple consecutive single deletions are
not allowed (see limitations).

In contrast to the conventional Delete() operation, the deletion entry is
removed along with the value when the two are lined up in a compaction. Note:
The semantics are similar to @igor's prototype that allowed to have this
behavior on the granularity of a column family (
https://reviews.facebook.net/D42093 ). This new patch, however, is more
aggressive when it comes to removing tombstones: It removes the SingleDelete
together with the value whenever there is no snapshot between them while the
older patch only did this when the sequence number of the deletion was older
than the earliest snapshot.

Most of the complex additions are in the Compaction Iterator, all other changes
should be relatively straightforward. The patch also includes basic support for
single deletions in db_stress and db_bench.

Limitations:
- Not compatible with cuckoo hash tables
- Single deletions cannot be used in combination with merges and normal
  deletions on the same key (other keys are not affected by this)
- Consecutive single deletions are currently not allowed (and older version of
  this patch supported this so it could be resurrected if needed)

Test Plan: make all check

Reviewers: yhchiang, sdong, rven, anthony, yoshinorim, igor

Reviewed By: igor

Subscribers: maykov, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D43179
2015-09-17 11:42:56 -07:00

667 lines
20 KiB
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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#pragma once
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <fcntl.h>
#include <inttypes.h>
#ifndef OS_WIN
#include <unistd.h>
#endif
#include <algorithm>
#include <set>
#include <string>
#include <thread>
#include <unordered_set>
#include <utility>
#include <vector>
#include "db/db_impl.h"
#include "db/dbformat.h"
#include "db/filename.h"
#include "rocksdb/cache.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/convenience.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/options.h"
#include "rocksdb/slice.h"
#include "rocksdb/table.h"
#include "rocksdb/utilities/checkpoint.h"
#include "table/block_based_table_factory.h"
#include "table/mock_table.h"
#include "table/plain_table_factory.h"
#include "util/compression.h"
#include "util/db_test_util.h"
#include "util/hash_linklist_rep.h"
#include "util/mock_env.h"
#include "util/mutexlock.h"
#include "util/scoped_arena_iterator.h"
#include "util/string_util.h"
// SyncPoint is not supported in Released Windows Mode.
#if !(defined NDEBUG) || !defined(OS_WIN)
#include "util/sync_point.h"
#endif // !(defined NDEBUG) || !defined(OS_WIN)
#include "util/testharness.h"
#include "util/testutil.h"
#include "util/xfunc.h"
#include "utilities/merge_operators.h"
namespace rocksdb {
namespace anon {
class AtomicCounter {
public:
explicit AtomicCounter(Env* env = NULL)
: env_(env), cond_count_(&mu_), count_(0) {}
void Increment() {
MutexLock l(&mu_);
count_++;
cond_count_.SignalAll();
}
int Read() {
MutexLock l(&mu_);
return count_;
}
bool WaitFor(int count) {
MutexLock l(&mu_);
uint64_t start = env_->NowMicros();
while (count_ < count) {
uint64_t now = env_->NowMicros();
cond_count_.TimedWait(now + /*1s*/ 1 * 1000 * 1000);
if (env_->NowMicros() - start > /*10s*/ 10 * 1000 * 1000) {
return false;
}
if (count_ < count) {
GTEST_LOG_(WARNING) << "WaitFor is taking more time than usual";
}
}
return true;
}
void Reset() {
MutexLock l(&mu_);
count_ = 0;
cond_count_.SignalAll();
}
private:
Env* env_;
port::Mutex mu_;
port::CondVar cond_count_;
int count_;
};
struct OptionsOverride {
std::shared_ptr<const FilterPolicy> filter_policy = nullptr;
// Used as a bit mask of individual enums in which to skip an XF test point
int skip_policy = 0;
};
} // namespace anon
// Special Env used to delay background operations
class SpecialEnv : public EnvWrapper {
public:
explicit SpecialEnv(Env* base);
Status NewWritableFile(const std::string& f, unique_ptr<WritableFile>* r,
const EnvOptions& soptions) override {
class SSTableFile : public WritableFile {
private:
SpecialEnv* env_;
unique_ptr<WritableFile> base_;
public:
SSTableFile(SpecialEnv* env, unique_ptr<WritableFile>&& base)
: env_(env),
base_(std::move(base)) {
}
Status Append(const Slice& data) override {
if (env_->table_write_callback_) {
(*env_->table_write_callback_)();
}
if (env_->drop_writes_.load(std::memory_order_acquire)) {
// Drop writes on the floor
return Status::OK();
} else if (env_->no_space_.load(std::memory_order_acquire)) {
return Status::IOError("No space left on device");
} else {
env_->bytes_written_ += data.size();
return base_->Append(data);
}
}
Status Truncate(uint64_t size) override {
return base_->Truncate(size);
}
Status Close() override {
// SyncPoint is not supported in Released Windows Mode.
#if !(defined NDEBUG) || !defined(OS_WIN)
// Check preallocation size
// preallocation size is never passed to base file.
size_t preallocation_size = preallocation_block_size();
TEST_SYNC_POINT_CALLBACK("DBTestWritableFile.GetPreallocationStatus",
&preallocation_size);
#endif // !(defined NDEBUG) || !defined(OS_WIN)
return base_->Close();
}
Status Flush() override { return base_->Flush(); }
Status Sync() override {
++env_->sync_counter_;
while (env_->delay_sstable_sync_.load(std::memory_order_acquire)) {
env_->SleepForMicroseconds(100000);
}
return base_->Sync();
}
void SetIOPriority(Env::IOPriority pri) override {
base_->SetIOPriority(pri);
}
Env::IOPriority GetIOPriority() override {
return base_->GetIOPriority();
}
};
class ManifestFile : public WritableFile {
public:
ManifestFile(SpecialEnv* env, unique_ptr<WritableFile>&& b)
: env_(env), base_(std::move(b)) { }
Status Append(const Slice& data) override {
if (env_->manifest_write_error_.load(std::memory_order_acquire)) {
return Status::IOError("simulated writer error");
} else {
return base_->Append(data);
}
}
Status Truncate(uint64_t size) override { return base_->Truncate(size); }
Status Close() override { return base_->Close(); }
Status Flush() override { return base_->Flush(); }
Status Sync() override {
++env_->sync_counter_;
if (env_->manifest_sync_error_.load(std::memory_order_acquire)) {
return Status::IOError("simulated sync error");
} else {
return base_->Sync();
}
}
uint64_t GetFileSize() override { return base_->GetFileSize(); }
private:
SpecialEnv* env_;
unique_ptr<WritableFile> base_;
};
class WalFile : public WritableFile {
public:
WalFile(SpecialEnv* env, unique_ptr<WritableFile>&& b)
: env_(env), base_(std::move(b)) {}
Status Append(const Slice& data) override {
#if !(defined NDEBUG) || !defined(OS_WIN)
TEST_SYNC_POINT("SpecialEnv::WalFile::Append:1");
#endif
Status s;
if (env_->log_write_error_.load(std::memory_order_acquire)) {
s = Status::IOError("simulated writer error");
} else {
int slowdown =
env_->log_write_slowdown_.load(std::memory_order_acquire);
if (slowdown > 0) {
env_->SleepForMicroseconds(slowdown);
}
s = base_->Append(data);
}
#if !(defined NDEBUG) || !defined(OS_WIN)
TEST_SYNC_POINT("SpecialEnv::WalFile::Append:2");
#endif
return s;
}
Status Truncate(uint64_t size) override { return base_->Truncate(size); }
Status Close() override { return base_->Close(); }
Status Flush() override { return base_->Flush(); }
Status Sync() override {
++env_->sync_counter_;
return base_->Sync();
}
bool IsSyncThreadSafe() const override {
return env_->is_wal_sync_thread_safe_.load();
}
private:
SpecialEnv* env_;
unique_ptr<WritableFile> base_;
};
if (non_writeable_rate_.load(std::memory_order_acquire) > 0) {
uint32_t random_number;
{
MutexLock l(&rnd_mutex_);
random_number = rnd_.Uniform(100);
}
if (random_number < non_writeable_rate_.load()) {
return Status::IOError("simulated random write error");
}
}
new_writable_count_++;
if (non_writable_count_.load() > 0) {
non_writable_count_--;
return Status::IOError("simulated write error");
}
Status s = target()->NewWritableFile(f, r, soptions);
if (s.ok()) {
if (strstr(f.c_str(), ".sst") != nullptr) {
r->reset(new SSTableFile(this, std::move(*r)));
} else if (strstr(f.c_str(), "MANIFEST") != nullptr) {
r->reset(new ManifestFile(this, std::move(*r)));
} else if (strstr(f.c_str(), "log") != nullptr) {
r->reset(new WalFile(this, std::move(*r)));
}
}
return s;
}
Status NewRandomAccessFile(const std::string& f,
unique_ptr<RandomAccessFile>* r,
const EnvOptions& soptions) override {
class CountingFile : public RandomAccessFile {
public:
CountingFile(unique_ptr<RandomAccessFile>&& target,
anon::AtomicCounter* counter)
: target_(std::move(target)), counter_(counter) {
}
virtual Status Read(uint64_t offset, size_t n, Slice* result,
char* scratch) const override {
counter_->Increment();
return target_->Read(offset, n, result, scratch);
}
private:
unique_ptr<RandomAccessFile> target_;
anon::AtomicCounter* counter_;
};
Status s = target()->NewRandomAccessFile(f, r, soptions);
random_file_open_counter_++;
if (s.ok() && count_random_reads_) {
r->reset(new CountingFile(std::move(*r), &random_read_counter_));
}
return s;
}
Status NewSequentialFile(const std::string& f, unique_ptr<SequentialFile>* r,
const EnvOptions& soptions) override {
class CountingFile : public SequentialFile {
public:
CountingFile(unique_ptr<SequentialFile>&& target,
anon::AtomicCounter* counter)
: target_(std::move(target)), counter_(counter) {}
virtual Status Read(size_t n, Slice* result, char* scratch) override {
counter_->Increment();
return target_->Read(n, result, scratch);
}
virtual Status Skip(uint64_t n) override { return target_->Skip(n); }
private:
unique_ptr<SequentialFile> target_;
anon::AtomicCounter* counter_;
};
Status s = target()->NewSequentialFile(f, r, soptions);
if (s.ok() && count_sequential_reads_) {
r->reset(new CountingFile(std::move(*r), &sequential_read_counter_));
}
return s;
}
virtual void SleepForMicroseconds(int micros) override {
sleep_counter_.Increment();
if (no_sleep_) {
addon_time_.fetch_add(micros);
} else {
target()->SleepForMicroseconds(micros);
}
}
virtual Status GetCurrentTime(int64_t* unix_time) override {
Status s = target()->GetCurrentTime(unix_time);
if (s.ok()) {
*unix_time += addon_time_.load();
}
return s;
}
virtual uint64_t NowNanos() override {
return target()->NowNanos() + addon_time_.load() * 1000;
}
virtual uint64_t NowMicros() override {
return target()->NowMicros() + addon_time_.load();
}
Random rnd_;
port::Mutex rnd_mutex_; // Lock to pretect rnd_
// sstable Sync() calls are blocked while this pointer is non-nullptr.
std::atomic<bool> delay_sstable_sync_;
// Drop writes on the floor while this pointer is non-nullptr.
std::atomic<bool> drop_writes_;
// Simulate no-space errors while this pointer is non-nullptr.
std::atomic<bool> no_space_;
// Simulate non-writable file system while this pointer is non-nullptr
std::atomic<bool> non_writable_;
// Force sync of manifest files to fail while this pointer is non-nullptr
std::atomic<bool> manifest_sync_error_;
// Force write to manifest files to fail while this pointer is non-nullptr
std::atomic<bool> manifest_write_error_;
// Force write to log files to fail while this pointer is non-nullptr
std::atomic<bool> log_write_error_;
// Slow down every log write, in micro-seconds.
std::atomic<int> log_write_slowdown_;
bool count_random_reads_;
anon::AtomicCounter random_read_counter_;
std::atomic<int> random_file_open_counter_;
bool count_sequential_reads_;
anon::AtomicCounter sequential_read_counter_;
anon::AtomicCounter sleep_counter_;
std::atomic<int64_t> bytes_written_;
std::atomic<int> sync_counter_;
std::atomic<uint32_t> non_writeable_rate_;
std::atomic<uint32_t> new_writable_count_;
std::atomic<uint32_t> non_writable_count_;
std::function<void()>* table_write_callback_;
std::atomic<int64_t> addon_time_;
bool no_sleep_;
std::atomic<bool> is_wal_sync_thread_safe_ {true};
};
class DBTestBase : public testing::Test {
protected:
// Sequence of option configurations to try
enum OptionConfig {
kDefault = 0,
kBlockBasedTableWithPrefixHashIndex = 1,
kBlockBasedTableWithWholeKeyHashIndex = 2,
kPlainTableFirstBytePrefix = 3,
kPlainTableCappedPrefix = 4,
kPlainTableAllBytesPrefix = 5,
kVectorRep = 6,
kHashLinkList = 7,
kHashCuckoo = 8,
kMergePut = 9,
kFilter = 10,
kFullFilterWithNewTableReaderForCompactions = 11,
kUncompressed = 12,
kNumLevel_3 = 13,
kDBLogDir = 14,
kWalDirAndMmapReads = 15,
kManifestFileSize = 16,
kPerfOptions = 17,
kDeletesFilterFirst = 18,
kHashSkipList = 19,
kUniversalCompaction = 20,
kUniversalCompactionMultiLevel = 21,
kCompressedBlockCache = 22,
kInfiniteMaxOpenFiles = 23,
kxxHashChecksum = 24,
kFIFOCompaction = 25,
kOptimizeFiltersForHits = 26,
kRowCache = 27,
kLevelSubcompactions = 28,
kUniversalSubcompactions = 29,
kEnd = 28
};
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);
}
// 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);
int NumSortedRuns(int cf = 0);
uint64_t TotalSize(int cf = 0);
int NumTableFilesAtLevel(int level, int cf = 0);
uint64_t SizeAtLevel(int level);
int TotalLiveFiles(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();
size_t CountLiveFiles();
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();
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);
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