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rocksdb/db/fault_injection_test.cc

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// Copyright (c) 2011-present, 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 2014 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.
// This test uses a custom Env to keep track of the state of a filesystem as of
// the last "sync". It then checks for data loss errors by purposely dropping
// file data (or entire files) not protected by a "sync".
#include "db/db_impl.h"
#include "db/filename.h"
#include "db/log_format.h"
#include "db/version_set.h"
#include "rocksdb/cache.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/table.h"
#include "rocksdb/write_batch.h"
#include "util/fault_injection_test_env.h"
#include "util/logging.h"
#include "util/mock_env.h"
#include "util/mutexlock.h"
#include "util/sync_point.h"
#include "util/testharness.h"
#include "util/testutil.h"
namespace rocksdb {
static const int kValueSize = 1000;
static const int kMaxNumValues = 2000;
static const size_t kNumIterations = 3;
class FaultInjectionTest : public testing::Test,
public testing::WithParamInterface<bool> {
protected:
enum OptionConfig {
kDefault,
kDifferentDataDir,
kWalDir,
kSyncWal,
kWalDirSyncWal,
kMultiLevels,
kEnd,
};
int option_config_;
// When need to make sure data is persistent, sync WAL
bool sync_use_wal_;
// When need to make sure data is persistent, call DB::CompactRange()
bool sync_use_compact_;
bool sequential_order_;
protected:
public:
enum ExpectedVerifResult { kValExpectFound, kValExpectNoError };
enum ResetMethod {
kResetDropUnsyncedData,
kResetDropRandomUnsyncedData,
kResetDeleteUnsyncedFiles,
kResetDropAndDeleteUnsynced
};
std::unique_ptr<Env> base_env_;
FaultInjectionTestEnv* env_;
std::string dbname_;
shared_ptr<Cache> tiny_cache_;
Options options_;
DB* db_;
FaultInjectionTest()
: option_config_(kDefault),
sync_use_wal_(false),
sync_use_compact_(true),
base_env_(nullptr),
env_(NULL),
db_(NULL) {
}
~FaultInjectionTest() {
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
bool ChangeOptions() {
option_config_++;
if (option_config_ >= kEnd) {
return false;
} else {
if (option_config_ == kMultiLevels) {
base_env_.reset(new MockEnv(Env::Default()));
}
return true;
}
}
// Return the current option configuration.
Options CurrentOptions() {
sync_use_wal_ = false;
sync_use_compact_ = true;
Options options;
switch (option_config_) {
case kWalDir:
options.wal_dir = test::TmpDir(env_) + "/fault_test_wal";
break;
case kDifferentDataDir:
options.db_paths.emplace_back(test::TmpDir(env_) + "/fault_test_data",
1000000U);
break;
case kSyncWal:
sync_use_wal_ = true;
sync_use_compact_ = false;
break;
case kWalDirSyncWal:
options.wal_dir = test::TmpDir(env_) + "/fault_test_wal";
sync_use_wal_ = true;
sync_use_compact_ = false;
break;
case kMultiLevels:
options.write_buffer_size = 64 * 1024;
options.target_file_size_base = 64 * 1024;
options.level0_file_num_compaction_trigger = 2;
options.level0_slowdown_writes_trigger = 2;
options.level0_stop_writes_trigger = 4;
options.max_bytes_for_level_base = 128 * 1024;
options.max_write_buffer_number = 2;
options.max_background_compactions = 8;
options.max_background_flushes = 8;
sync_use_wal_ = true;
sync_use_compact_ = false;
break;
default:
break;
}
return options;
}
Status NewDB() {
assert(db_ == NULL);
assert(tiny_cache_ == nullptr);
assert(env_ == NULL);
env_ =
new FaultInjectionTestEnv(base_env_ ? base_env_.get() : Env::Default());
options_ = CurrentOptions();
options_.env = env_;
options_.paranoid_checks = true;
BlockBasedTableOptions table_options;
tiny_cache_ = NewLRUCache(100);
table_options.block_cache = tiny_cache_;
options_.table_factory.reset(NewBlockBasedTableFactory(table_options));
dbname_ = test::TmpDir() + "/fault_test";
EXPECT_OK(DestroyDB(dbname_, options_));
options_.create_if_missing = true;
Status s = OpenDB();
options_.create_if_missing = false;
return s;
}
void SetUp() override {
sequential_order_ = GetParam();
ASSERT_OK(NewDB());
}
void TearDown() override {
CloseDB();
Status s = DestroyDB(dbname_, options_);
delete env_;
env_ = NULL;
tiny_cache_.reset();
ASSERT_OK(s);
}
void Build(const WriteOptions& write_options, int start_idx, int num_vals) {
std::string key_space, value_space;
WriteBatch batch;
for (int i = start_idx; i < start_idx + num_vals; i++) {
Slice key = Key(i, &key_space);
batch.Clear();
batch.Put(key, Value(i, &value_space));
ASSERT_OK(db_->Write(write_options, &batch));
}
}
Status ReadValue(int i, std::string* val) const {
std::string key_space, value_space;
Slice key = Key(i, &key_space);
Value(i, &value_space);
ReadOptions options;
return db_->Get(options, key, val);
}
Status Verify(int start_idx, int num_vals,
ExpectedVerifResult expected) const {
std::string val;
std::string value_space;
Status s;
for (int i = start_idx; i < start_idx + num_vals && s.ok(); i++) {
Value(i, &value_space);
s = ReadValue(i, &val);
if (s.ok()) {
EXPECT_EQ(value_space, val);
}
if (expected == kValExpectFound) {
if (!s.ok()) {
fprintf(stderr, "Error when read %dth record (expect found): %s\n", i,
s.ToString().c_str());
return s;
}
} else if (!s.ok() && !s.IsNotFound()) {
fprintf(stderr, "Error when read %dth record: %s\n", i,
s.ToString().c_str());
return s;
}
}
return Status::OK();
}
// Return the ith key
Slice Key(int i, std::string* storage) const {
int num = i;
if (!sequential_order_) {
// random transfer
const int m = 0x5bd1e995;
num *= m;
num ^= num << 24;
}
char buf[100];
snprintf(buf, sizeof(buf), "%016d", num);
storage->assign(buf, strlen(buf));
return Slice(*storage);
}
// Return the value to associate with the specified key
Slice Value(int k, std::string* storage) const {
Random r(k);
return test::RandomString(&r, kValueSize, storage);
}
void CloseDB() {
delete db_;
db_ = NULL;
}
Status OpenDB() {
CloseDB();
env_->ResetState();
return DB::Open(options_, dbname_, &db_);
}
void DeleteAllData() {
Iterator* iter = db_->NewIterator(ReadOptions());
WriteOptions options;
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
ASSERT_OK(db_->Delete(WriteOptions(), iter->key()));
}
delete iter;
FlushOptions flush_options;
flush_options.wait = true;
db_->Flush(flush_options);
}
// rnd cannot be null for kResetDropRandomUnsyncedData
void ResetDBState(ResetMethod reset_method, Random* rnd = nullptr) {
env_->AssertNoOpenFile();
switch (reset_method) {
case kResetDropUnsyncedData:
ASSERT_OK(env_->DropUnsyncedFileData());
break;
case kResetDropRandomUnsyncedData:
ASSERT_OK(env_->DropRandomUnsyncedFileData(rnd));
break;
case kResetDeleteUnsyncedFiles:
ASSERT_OK(env_->DeleteFilesCreatedAfterLastDirSync());
break;
case kResetDropAndDeleteUnsynced:
ASSERT_OK(env_->DropUnsyncedFileData());
ASSERT_OK(env_->DeleteFilesCreatedAfterLastDirSync());
break;
default:
assert(false);
}
}
void PartialCompactTestPreFault(int num_pre_sync, int num_post_sync) {
DeleteAllData();
WriteOptions write_options;
write_options.sync = sync_use_wal_;
Build(write_options, 0, num_pre_sync);
if (sync_use_compact_) {
db_->CompactRange(CompactRangeOptions(), nullptr, nullptr);
}
write_options.sync = false;
Build(write_options, num_pre_sync, num_post_sync);
}
void PartialCompactTestReopenWithFault(ResetMethod reset_method,
int num_pre_sync, int num_post_sync,
Random* rnd = nullptr) {
env_->SetFilesystemActive(false);
CloseDB();
ResetDBState(reset_method, rnd);
ASSERT_OK(OpenDB());
ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::kValExpectFound));
ASSERT_OK(Verify(num_pre_sync, num_post_sync,
FaultInjectionTest::kValExpectNoError));
WaitCompactionFinish();
ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::kValExpectFound));
ASSERT_OK(Verify(num_pre_sync, num_post_sync,
FaultInjectionTest::kValExpectNoError));
}
void NoWriteTestPreFault() {
}
void NoWriteTestReopenWithFault(ResetMethod reset_method) {
CloseDB();
ResetDBState(reset_method);
ASSERT_OK(OpenDB());
}
void WaitCompactionFinish() {
static_cast<DBImpl*>(db_->GetRootDB())->TEST_WaitForCompact();
ASSERT_OK(db_->Put(WriteOptions(), "", ""));
}
};
TEST_P(FaultInjectionTest, FaultTest) {
do {
Random rnd(301);
for (size_t idx = 0; idx < kNumIterations; idx++) {
int num_pre_sync = rnd.Uniform(kMaxNumValues);
int num_post_sync = rnd.Uniform(kMaxNumValues);
PartialCompactTestPreFault(num_pre_sync, num_post_sync);
PartialCompactTestReopenWithFault(kResetDropUnsyncedData, num_pre_sync,
num_post_sync);
NoWriteTestPreFault();
NoWriteTestReopenWithFault(kResetDropUnsyncedData);
PartialCompactTestPreFault(num_pre_sync, num_post_sync);
PartialCompactTestReopenWithFault(kResetDropRandomUnsyncedData,
num_pre_sync, num_post_sync, &rnd);
NoWriteTestPreFault();
NoWriteTestReopenWithFault(kResetDropUnsyncedData);
// Setting a separate data path won't pass the test as we don't sync
// it after creating new files,
PartialCompactTestPreFault(num_pre_sync, num_post_sync);
PartialCompactTestReopenWithFault(kResetDropAndDeleteUnsynced,
num_pre_sync, num_post_sync);
NoWriteTestPreFault();
NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
PartialCompactTestPreFault(num_pre_sync, num_post_sync);
// No new files created so we expect all values since no files will be
// dropped.
PartialCompactTestReopenWithFault(kResetDeleteUnsyncedFiles, num_pre_sync,
num_post_sync);
NoWriteTestPreFault();
NoWriteTestReopenWithFault(kResetDeleteUnsyncedFiles);
}
} while (ChangeOptions());
}
// Previous log file is not fsynced if sync is forced after log rolling.
TEST_P(FaultInjectionTest, WriteOptionSyncTest) {
test::SleepingBackgroundTask sleeping_task_low;
env_->SetBackgroundThreads(1, Env::HIGH);
// Block the job queue to prevent flush job from running.
env_->Schedule(&test::SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::HIGH);
sleeping_task_low.WaitUntilSleeping();
WriteOptions write_options;
write_options.sync = false;
std::string key_space, value_space;
ASSERT_OK(
db_->Put(write_options, Key(1, &key_space), Value(1, &value_space)));
FlushOptions flush_options;
flush_options.wait = false;
ASSERT_OK(db_->Flush(flush_options));
write_options.sync = true;
ASSERT_OK(
db_->Put(write_options, Key(2, &key_space), Value(2, &value_space)));
env_->SetFilesystemActive(false);
NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
sleeping_task_low.WakeUp();
ASSERT_OK(OpenDB());
std::string val;
Value(2, &value_space);
ASSERT_OK(ReadValue(2, &val));
ASSERT_EQ(value_space, val);
Value(1, &value_space);
ASSERT_OK(ReadValue(1, &val));
ASSERT_EQ(value_space, val);
}
TEST_P(FaultInjectionTest, UninstalledCompaction) {
options_.target_file_size_base = 32 * 1024;
options_.write_buffer_size = 100 << 10; // 100KB
options_.level0_file_num_compaction_trigger = 6;
options_.level0_stop_writes_trigger = 1 << 10;
options_.level0_slowdown_writes_trigger = 1 << 10;
options_.max_background_compactions = 1;
OpenDB();
if (!sequential_order_) {
rocksdb::SyncPoint::GetInstance()->LoadDependency({
{"FaultInjectionTest::FaultTest:0", "DBImpl::BGWorkCompaction"},
{"CompactionJob::Run():End", "FaultInjectionTest::FaultTest:1"},
{"FaultInjectionTest::FaultTest:2",
"DBImpl::BackgroundCompaction:NonTrivial:AfterRun"},
});
}
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
int kNumKeys = 1000;
Build(WriteOptions(), 0, kNumKeys);
FlushOptions flush_options;
flush_options.wait = true;
db_->Flush(flush_options);
ASSERT_OK(db_->Put(WriteOptions(), "", ""));
TEST_SYNC_POINT("FaultInjectionTest::FaultTest:0");
TEST_SYNC_POINT("FaultInjectionTest::FaultTest:1");
env_->SetFilesystemActive(false);
TEST_SYNC_POINT("FaultInjectionTest::FaultTest:2");
CloseDB();
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
ResetDBState(kResetDropUnsyncedData);
std::atomic<bool> opened(false);
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::Open:Opened", [&](void* arg) { opened.store(true); });
rocksdb::SyncPoint::GetInstance()->SetCallBack(
"DBImpl::BGWorkCompaction",
[&](void* arg) { ASSERT_TRUE(opened.load()); });
rocksdb::SyncPoint::GetInstance()->EnableProcessing();
ASSERT_OK(OpenDB());
ASSERT_OK(Verify(0, kNumKeys, FaultInjectionTest::kValExpectFound));
WaitCompactionFinish();
ASSERT_OK(Verify(0, kNumKeys, FaultInjectionTest::kValExpectFound));
rocksdb::SyncPoint::GetInstance()->DisableProcessing();
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
}
TEST_P(FaultInjectionTest, ManualLogSyncTest) {
test::SleepingBackgroundTask sleeping_task_low;
env_->SetBackgroundThreads(1, Env::HIGH);
// Block the job queue to prevent flush job from running.
env_->Schedule(&test::SleepingBackgroundTask::DoSleepTask, &sleeping_task_low,
Env::Priority::HIGH);
sleeping_task_low.WaitUntilSleeping();
WriteOptions write_options;
write_options.sync = false;
std::string key_space, value_space;
ASSERT_OK(
db_->Put(write_options, Key(1, &key_space), Value(1, &value_space)));
FlushOptions flush_options;
flush_options.wait = false;
ASSERT_OK(db_->Flush(flush_options));
ASSERT_OK(
db_->Put(write_options, Key(2, &key_space), Value(2, &value_space)));
ASSERT_OK(db_->SyncWAL());
env_->SetFilesystemActive(false);
NoWriteTestReopenWithFault(kResetDropAndDeleteUnsynced);
sleeping_task_low.WakeUp();
ASSERT_OK(OpenDB());
std::string val;
Value(2, &value_space);
ASSERT_OK(ReadValue(2, &val));
ASSERT_EQ(value_space, val);
Value(1, &value_space);
ASSERT_OK(ReadValue(1, &val));
ASSERT_EQ(value_space, val);
}
INSTANTIATE_TEST_CASE_P(FaultTest, FaultInjectionTest, ::testing::Bool());
} // namespace rocksdb
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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