Du kan inte välja fler än 25 ämnen
Ämnen måste starta med en bokstav eller siffra, kan innehålla bindestreck ('-') och vara max 35 tecken långa.
562 rader
16 KiB
562 rader
16 KiB
// 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 <map>
|
|
#include <set>
|
|
|
|
#include "leveldb/db.h"
|
|
#include "db/db_impl.h"
|
|
#include "db/filename.h"
|
|
#include "db/log_format.h"
|
|
#include "db/version_set.h"
|
|
#include "leveldb/cache.h"
|
|
#include "leveldb/env.h"
|
|
#include "leveldb/table.h"
|
|
#include "leveldb/write_batch.h"
|
|
#include "port/port.h"
|
|
#include "port/thread_annotations.h"
|
|
#include "util/logging.h"
|
|
#include "util/mutexlock.h"
|
|
#include "util/testharness.h"
|
|
#include "util/testutil.h"
|
|
|
|
namespace leveldb {
|
|
|
|
static const int kValueSize = 1000;
|
|
static const int kMaxNumValues = 2000;
|
|
static const size_t kNumIterations = 3;
|
|
|
|
class FaultInjectionTestEnv;
|
|
|
|
namespace {
|
|
|
|
// Assume a filename, and not a directory name like "/foo/bar/"
|
|
static std::string GetDirName(const std::string& filename) {
|
|
size_t found = filename.find_last_of("/\\");
|
|
if (found == std::string::npos) {
|
|
return "";
|
|
} else {
|
|
return filename.substr(0, found);
|
|
}
|
|
}
|
|
|
|
Status SyncDir(const std::string& dir) {
|
|
// As this is a test it isn't required to *actually* sync this directory.
|
|
return Status::OK();
|
|
}
|
|
|
|
// A basic file truncation function suitable for this test.
|
|
Status Truncate(const std::string& filename, uint64_t length) {
|
|
leveldb::Env* env = leveldb::Env::Default();
|
|
|
|
SequentialFile* orig_file;
|
|
Status s = env->NewSequentialFile(filename, &orig_file);
|
|
if (!s.ok())
|
|
return s;
|
|
|
|
char* scratch = new char[length];
|
|
leveldb::Slice result;
|
|
s = orig_file->Read(length, &result, scratch);
|
|
delete orig_file;
|
|
if (s.ok()) {
|
|
std::string tmp_name = GetDirName(filename) + "/truncate.tmp";
|
|
WritableFile* tmp_file;
|
|
s = env->NewWritableFile(tmp_name, &tmp_file);
|
|
if (s.ok()) {
|
|
s = tmp_file->Append(result);
|
|
delete tmp_file;
|
|
if (s.ok()) {
|
|
s = env->RenameFile(tmp_name, filename);
|
|
} else {
|
|
env->DeleteFile(tmp_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
delete[] scratch;
|
|
|
|
return s;
|
|
}
|
|
|
|
struct FileState {
|
|
std::string filename_;
|
|
ssize_t pos_;
|
|
ssize_t pos_at_last_sync_;
|
|
ssize_t pos_at_last_flush_;
|
|
|
|
FileState(const std::string& filename)
|
|
: filename_(filename),
|
|
pos_(-1),
|
|
pos_at_last_sync_(-1),
|
|
pos_at_last_flush_(-1) { }
|
|
|
|
FileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
|
|
|
|
bool IsFullySynced() const { return pos_ <= 0 || pos_ == pos_at_last_sync_; }
|
|
|
|
Status DropUnsyncedData() const;
|
|
};
|
|
|
|
} // anonymous namespace
|
|
|
|
// A wrapper around WritableFile which informs another Env whenever this file
|
|
// is written to or sync'ed.
|
|
class TestWritableFile : public WritableFile {
|
|
public:
|
|
TestWritableFile(const FileState& state,
|
|
WritableFile* f,
|
|
FaultInjectionTestEnv* env);
|
|
virtual ~TestWritableFile();
|
|
virtual Status Append(const Slice& data);
|
|
virtual Status Close();
|
|
virtual Status Flush();
|
|
virtual Status Sync();
|
|
|
|
private:
|
|
FileState state_;
|
|
WritableFile* target_;
|
|
bool writable_file_opened_;
|
|
FaultInjectionTestEnv* env_;
|
|
|
|
Status SyncParent();
|
|
};
|
|
|
|
class FaultInjectionTestEnv : public EnvWrapper {
|
|
public:
|
|
FaultInjectionTestEnv()
|
|
: EnvWrapper(Env::Default()), filesystem_active_(true) {}
|
|
virtual ~FaultInjectionTestEnv() { }
|
|
virtual Status NewWritableFile(const std::string& fname,
|
|
WritableFile** result);
|
|
virtual Status NewAppendableFile(const std::string& fname,
|
|
WritableFile** result);
|
|
virtual Status DeleteFile(const std::string& f);
|
|
virtual Status RenameFile(const std::string& s, const std::string& t);
|
|
|
|
void WritableFileClosed(const FileState& state);
|
|
Status DropUnsyncedFileData();
|
|
Status DeleteFilesCreatedAfterLastDirSync();
|
|
void DirWasSynced();
|
|
bool IsFileCreatedSinceLastDirSync(const std::string& filename);
|
|
void ResetState();
|
|
void UntrackFile(const std::string& f);
|
|
// Setting the filesystem to inactive is the test equivalent to simulating a
|
|
// system reset. Setting to inactive will freeze our saved filesystem state so
|
|
// that it will stop being recorded. It can then be reset back to the state at
|
|
// the time of the reset.
|
|
bool IsFilesystemActive() LOCKS_EXCLUDED(mutex_) {
|
|
MutexLock l(&mutex_);
|
|
return filesystem_active_;
|
|
}
|
|
void SetFilesystemActive(bool active) LOCKS_EXCLUDED(mutex_) {
|
|
MutexLock l(&mutex_);
|
|
filesystem_active_ = active;
|
|
}
|
|
|
|
private:
|
|
port::Mutex mutex_;
|
|
std::map<std::string, FileState> db_file_state_ GUARDED_BY(mutex_);
|
|
std::set<std::string> new_files_since_last_dir_sync_ GUARDED_BY(mutex_);
|
|
bool filesystem_active_ GUARDED_BY(mutex_); // Record flushes, syncs, writes
|
|
};
|
|
|
|
TestWritableFile::TestWritableFile(const FileState& state,
|
|
WritableFile* f,
|
|
FaultInjectionTestEnv* env)
|
|
: state_(state),
|
|
target_(f),
|
|
writable_file_opened_(true),
|
|
env_(env) {
|
|
assert(f != nullptr);
|
|
}
|
|
|
|
TestWritableFile::~TestWritableFile() {
|
|
if (writable_file_opened_) {
|
|
Close();
|
|
}
|
|
delete target_;
|
|
}
|
|
|
|
Status TestWritableFile::Append(const Slice& data) {
|
|
Status s = target_->Append(data);
|
|
if (s.ok() && env_->IsFilesystemActive()) {
|
|
state_.pos_ += data.size();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status TestWritableFile::Close() {
|
|
writable_file_opened_ = false;
|
|
Status s = target_->Close();
|
|
if (s.ok()) {
|
|
env_->WritableFileClosed(state_);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status TestWritableFile::Flush() {
|
|
Status s = target_->Flush();
|
|
if (s.ok() && env_->IsFilesystemActive()) {
|
|
state_.pos_at_last_flush_ = state_.pos_;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status TestWritableFile::SyncParent() {
|
|
Status s = SyncDir(GetDirName(state_.filename_));
|
|
if (s.ok()) {
|
|
env_->DirWasSynced();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status TestWritableFile::Sync() {
|
|
if (!env_->IsFilesystemActive()) {
|
|
return Status::OK();
|
|
}
|
|
// Ensure new files referred to by the manifest are in the filesystem.
|
|
Status s = target_->Sync();
|
|
if (s.ok()) {
|
|
state_.pos_at_last_sync_ = state_.pos_;
|
|
}
|
|
if (env_->IsFileCreatedSinceLastDirSync(state_.filename_)) {
|
|
Status ps = SyncParent();
|
|
if (s.ok() && !ps.ok()) {
|
|
s = ps;
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::NewWritableFile(const std::string& fname,
|
|
WritableFile** result) {
|
|
WritableFile* actual_writable_file;
|
|
Status s = target()->NewWritableFile(fname, &actual_writable_file);
|
|
if (s.ok()) {
|
|
FileState state(fname);
|
|
state.pos_ = 0;
|
|
*result = new TestWritableFile(state, actual_writable_file, this);
|
|
// NewWritableFile doesn't append to files, so if the same file is
|
|
// opened again then it will be truncated - so forget our saved
|
|
// state.
|
|
UntrackFile(fname);
|
|
MutexLock l(&mutex_);
|
|
new_files_since_last_dir_sync_.insert(fname);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::NewAppendableFile(const std::string& fname,
|
|
WritableFile** result) {
|
|
WritableFile* actual_writable_file;
|
|
Status s = target()->NewAppendableFile(fname, &actual_writable_file);
|
|
if (s.ok()) {
|
|
FileState state(fname);
|
|
state.pos_ = 0;
|
|
{
|
|
MutexLock l(&mutex_);
|
|
if (db_file_state_.count(fname) == 0) {
|
|
new_files_since_last_dir_sync_.insert(fname);
|
|
} else {
|
|
state = db_file_state_[fname];
|
|
}
|
|
}
|
|
*result = new TestWritableFile(state, actual_writable_file, this);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::DropUnsyncedFileData() {
|
|
Status s;
|
|
MutexLock l(&mutex_);
|
|
for (std::map<std::string, FileState>::const_iterator it =
|
|
db_file_state_.begin();
|
|
s.ok() && it != db_file_state_.end(); ++it) {
|
|
const FileState& state = it->second;
|
|
if (!state.IsFullySynced()) {
|
|
s = state.DropUnsyncedData();
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void FaultInjectionTestEnv::DirWasSynced() {
|
|
MutexLock l(&mutex_);
|
|
new_files_since_last_dir_sync_.clear();
|
|
}
|
|
|
|
bool FaultInjectionTestEnv::IsFileCreatedSinceLastDirSync(
|
|
const std::string& filename) {
|
|
MutexLock l(&mutex_);
|
|
return new_files_since_last_dir_sync_.find(filename) !=
|
|
new_files_since_last_dir_sync_.end();
|
|
}
|
|
|
|
void FaultInjectionTestEnv::UntrackFile(const std::string& f) {
|
|
MutexLock l(&mutex_);
|
|
db_file_state_.erase(f);
|
|
new_files_since_last_dir_sync_.erase(f);
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::DeleteFile(const std::string& f) {
|
|
Status s = EnvWrapper::DeleteFile(f);
|
|
ASSERT_OK(s);
|
|
if (s.ok()) {
|
|
UntrackFile(f);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::RenameFile(const std::string& s,
|
|
const std::string& t) {
|
|
Status ret = EnvWrapper::RenameFile(s, t);
|
|
|
|
if (ret.ok()) {
|
|
MutexLock l(&mutex_);
|
|
if (db_file_state_.find(s) != db_file_state_.end()) {
|
|
db_file_state_[t] = db_file_state_[s];
|
|
db_file_state_.erase(s);
|
|
}
|
|
|
|
if (new_files_since_last_dir_sync_.erase(s) != 0) {
|
|
assert(new_files_since_last_dir_sync_.find(t) ==
|
|
new_files_since_last_dir_sync_.end());
|
|
new_files_since_last_dir_sync_.insert(t);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void FaultInjectionTestEnv::ResetState() {
|
|
// Since we are not destroying the database, the existing files
|
|
// should keep their recorded synced/flushed state. Therefore
|
|
// we do not reset db_file_state_ and new_files_since_last_dir_sync_.
|
|
SetFilesystemActive(true);
|
|
}
|
|
|
|
Status FaultInjectionTestEnv::DeleteFilesCreatedAfterLastDirSync() {
|
|
// Because DeleteFile access this container make a copy to avoid deadlock
|
|
mutex_.Lock();
|
|
std::set<std::string> new_files(new_files_since_last_dir_sync_.begin(),
|
|
new_files_since_last_dir_sync_.end());
|
|
mutex_.Unlock();
|
|
Status s;
|
|
std::set<std::string>::const_iterator it;
|
|
for (it = new_files.begin(); s.ok() && it != new_files.end(); ++it) {
|
|
s = DeleteFile(*it);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void FaultInjectionTestEnv::WritableFileClosed(const FileState& state) {
|
|
MutexLock l(&mutex_);
|
|
db_file_state_[state.filename_] = state;
|
|
}
|
|
|
|
Status FileState::DropUnsyncedData() const {
|
|
ssize_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
|
|
return Truncate(filename_, sync_pos);
|
|
}
|
|
|
|
class FaultInjectionTest {
|
|
public:
|
|
enum ExpectedVerifResult { VAL_EXPECT_NO_ERROR, VAL_EXPECT_ERROR };
|
|
enum ResetMethod { RESET_DROP_UNSYNCED_DATA, RESET_DELETE_UNSYNCED_FILES };
|
|
|
|
FaultInjectionTestEnv* env_;
|
|
std::string dbname_;
|
|
Cache* tiny_cache_;
|
|
Options options_;
|
|
DB* db_;
|
|
|
|
FaultInjectionTest()
|
|
: env_(new FaultInjectionTestEnv),
|
|
tiny_cache_(NewLRUCache(100)),
|
|
db_(nullptr) {
|
|
dbname_ = test::TmpDir() + "/fault_test";
|
|
DestroyDB(dbname_, Options()); // Destroy any db from earlier run
|
|
options_.reuse_logs = true;
|
|
options_.env = env_;
|
|
options_.paranoid_checks = true;
|
|
options_.block_cache = tiny_cache_;
|
|
options_.create_if_missing = true;
|
|
}
|
|
|
|
~FaultInjectionTest() {
|
|
CloseDB();
|
|
DestroyDB(dbname_, Options());
|
|
delete tiny_cache_;
|
|
delete env_;
|
|
}
|
|
|
|
void ReuseLogs(bool reuse) {
|
|
options_.reuse_logs = reuse;
|
|
}
|
|
|
|
void Build(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));
|
|
WriteOptions options;
|
|
ASSERT_OK(db_->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 (expected == VAL_EXPECT_NO_ERROR) {
|
|
if (s.ok()) {
|
|
ASSERT_EQ(value_space, val);
|
|
}
|
|
} else if (s.ok()) {
|
|
fprintf(stderr, "Expected an error at %d, but was OK\n", i);
|
|
s = Status::IOError(dbname_, "Expected value error:");
|
|
} else {
|
|
s = Status::OK(); // An expected error
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// Return the ith key
|
|
Slice Key(int i, std::string* storage) const {
|
|
char buf[100];
|
|
snprintf(buf, sizeof(buf), "%016d", i);
|
|
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);
|
|
}
|
|
|
|
Status OpenDB() {
|
|
delete db_;
|
|
db_ = nullptr;
|
|
env_->ResetState();
|
|
return DB::Open(options_, dbname_, &db_);
|
|
}
|
|
|
|
void CloseDB() {
|
|
delete db_;
|
|
db_ = nullptr;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void ResetDBState(ResetMethod reset_method) {
|
|
switch (reset_method) {
|
|
case RESET_DROP_UNSYNCED_DATA:
|
|
ASSERT_OK(env_->DropUnsyncedFileData());
|
|
break;
|
|
case RESET_DELETE_UNSYNCED_FILES:
|
|
ASSERT_OK(env_->DeleteFilesCreatedAfterLastDirSync());
|
|
break;
|
|
default:
|
|
assert(false);
|
|
}
|
|
}
|
|
|
|
void PartialCompactTestPreFault(int num_pre_sync, int num_post_sync) {
|
|
DeleteAllData();
|
|
Build(0, num_pre_sync);
|
|
db_->CompactRange(nullptr, nullptr);
|
|
Build(num_pre_sync, num_post_sync);
|
|
}
|
|
|
|
void PartialCompactTestReopenWithFault(ResetMethod reset_method,
|
|
int num_pre_sync,
|
|
int num_post_sync) {
|
|
env_->SetFilesystemActive(false);
|
|
CloseDB();
|
|
ResetDBState(reset_method);
|
|
ASSERT_OK(OpenDB());
|
|
ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::VAL_EXPECT_NO_ERROR));
|
|
ASSERT_OK(Verify(num_pre_sync, num_post_sync, FaultInjectionTest::VAL_EXPECT_ERROR));
|
|
}
|
|
|
|
void NoWriteTestPreFault() {
|
|
}
|
|
|
|
void NoWriteTestReopenWithFault(ResetMethod reset_method) {
|
|
CloseDB();
|
|
ResetDBState(reset_method);
|
|
ASSERT_OK(OpenDB());
|
|
}
|
|
|
|
void DoTest() {
|
|
Random rnd(0);
|
|
ASSERT_OK(OpenDB());
|
|
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(RESET_DROP_UNSYNCED_DATA,
|
|
num_pre_sync,
|
|
num_post_sync);
|
|
|
|
NoWriteTestPreFault();
|
|
NoWriteTestReopenWithFault(RESET_DROP_UNSYNCED_DATA);
|
|
|
|
PartialCompactTestPreFault(num_pre_sync, num_post_sync);
|
|
// No new files created so we expect all values since no files will be
|
|
// dropped.
|
|
PartialCompactTestReopenWithFault(RESET_DELETE_UNSYNCED_FILES,
|
|
num_pre_sync + num_post_sync,
|
|
0);
|
|
|
|
NoWriteTestPreFault();
|
|
NoWriteTestReopenWithFault(RESET_DELETE_UNSYNCED_FILES);
|
|
}
|
|
}
|
|
};
|
|
|
|
TEST(FaultInjectionTest, FaultTestNoLogReuse) {
|
|
ReuseLogs(false);
|
|
DoTest();
|
|
}
|
|
|
|
TEST(FaultInjectionTest, FaultTestWithLogReuse) {
|
|
ReuseLogs(true);
|
|
DoTest();
|
|
}
|
|
|
|
} // namespace leveldb
|
|
|
|
int main(int argc, char** argv) {
|
|
return leveldb::test::RunAllTests();
|
|
}
|