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550 lines
15 KiB
550 lines
15 KiB
// Copyright 2014 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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// This test uses a custom Env to keep track of the state of a filesystem as of
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// the last "sync". It then checks for data loss errors by purposely dropping
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// file data (or entire files) not protected by a "sync".
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#include <map>
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#include <set>
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#include "gtest/gtest.h"
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#include "db/db_impl.h"
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#include "db/filename.h"
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#include "db/log_format.h"
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#include "db/version_set.h"
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#include "leveldb/cache.h"
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#include "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/table.h"
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#include "leveldb/write_batch.h"
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#include "port/port.h"
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#include "port/thread_annotations.h"
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#include "util/logging.h"
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#include "util/mutexlock.h"
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#include "util/testutil.h"
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namespace leveldb {
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static const int kValueSize = 1000;
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static const int kMaxNumValues = 2000;
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static const size_t kNumIterations = 3;
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class FaultInjectionTestEnv;
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namespace {
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// Assume a filename, and not a directory name like "/foo/bar/"
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static std::string GetDirName(const std::string& filename) {
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size_t found = filename.find_last_of("/\\");
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if (found == std::string::npos) {
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return "";
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} else {
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return filename.substr(0, found);
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}
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}
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Status SyncDir(const std::string& dir) {
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// As this is a test it isn't required to *actually* sync this directory.
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return Status::OK();
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}
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// A basic file truncation function suitable for this test.
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Status Truncate(const std::string& filename, uint64_t length) {
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leveldb::Env* env = leveldb::Env::Default();
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SequentialFile* orig_file;
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Status s = env->NewSequentialFile(filename, &orig_file);
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if (!s.ok()) return s;
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char* scratch = new char[length];
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leveldb::Slice result;
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s = orig_file->Read(length, &result, scratch);
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delete orig_file;
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if (s.ok()) {
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std::string tmp_name = GetDirName(filename) + "/truncate.tmp";
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WritableFile* tmp_file;
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s = env->NewWritableFile(tmp_name, &tmp_file);
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if (s.ok()) {
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s = tmp_file->Append(result);
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delete tmp_file;
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if (s.ok()) {
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s = env->RenameFile(tmp_name, filename);
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} else {
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env->RemoveFile(tmp_name);
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}
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}
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}
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delete[] scratch;
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return s;
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}
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struct FileState {
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std::string filename_;
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int64_t pos_;
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int64_t pos_at_last_sync_;
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int64_t pos_at_last_flush_;
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FileState(const std::string& filename)
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: filename_(filename),
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pos_(-1),
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pos_at_last_sync_(-1),
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pos_at_last_flush_(-1) {}
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FileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
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bool IsFullySynced() const { return pos_ <= 0 || pos_ == pos_at_last_sync_; }
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Status DropUnsyncedData() const;
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};
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} // anonymous namespace
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// A wrapper around WritableFile which informs another Env whenever this file
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// is written to or sync'ed.
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class TestWritableFile : public WritableFile {
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public:
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TestWritableFile(const FileState& state, WritableFile* f,
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FaultInjectionTestEnv* env);
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~TestWritableFile() override;
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Status Append(const Slice& data) override;
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Status Close() override;
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Status Flush() override;
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Status Sync() override;
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private:
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FileState state_;
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WritableFile* target_;
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bool writable_file_opened_;
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FaultInjectionTestEnv* env_;
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Status SyncParent();
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};
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class FaultInjectionTestEnv : public EnvWrapper {
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public:
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FaultInjectionTestEnv()
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: EnvWrapper(Env::Default()), filesystem_active_(true) {}
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~FaultInjectionTestEnv() override = default;
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Status NewWritableFile(const std::string& fname,
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WritableFile** result) override;
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Status NewAppendableFile(const std::string& fname,
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WritableFile** result) override;
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Status RemoveFile(const std::string& f) override;
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Status RenameFile(const std::string& s, const std::string& t) override;
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void WritableFileClosed(const FileState& state);
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Status DropUnsyncedFileData();
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Status RemoveFilesCreatedAfterLastDirSync();
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void DirWasSynced();
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bool IsFileCreatedSinceLastDirSync(const std::string& filename);
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void ResetState();
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void UntrackFile(const std::string& f);
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// Setting the filesystem to inactive is the test equivalent to simulating a
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// system reset. Setting to inactive will freeze our saved filesystem state so
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// that it will stop being recorded. It can then be reset back to the state at
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// the time of the reset.
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bool IsFilesystemActive() LOCKS_EXCLUDED(mutex_) {
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MutexLock l(&mutex_);
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return filesystem_active_;
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}
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void SetFilesystemActive(bool active) LOCKS_EXCLUDED(mutex_) {
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MutexLock l(&mutex_);
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filesystem_active_ = active;
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}
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private:
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port::Mutex mutex_;
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std::map<std::string, FileState> db_file_state_ GUARDED_BY(mutex_);
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std::set<std::string> new_files_since_last_dir_sync_ GUARDED_BY(mutex_);
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bool filesystem_active_ GUARDED_BY(mutex_); // Record flushes, syncs, writes
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};
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TestWritableFile::TestWritableFile(const FileState& state, WritableFile* f,
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FaultInjectionTestEnv* env)
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: state_(state), target_(f), writable_file_opened_(true), env_(env) {
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assert(f != nullptr);
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}
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TestWritableFile::~TestWritableFile() {
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if (writable_file_opened_) {
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Close();
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}
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delete target_;
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}
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Status TestWritableFile::Append(const Slice& data) {
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Status s = target_->Append(data);
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if (s.ok() && env_->IsFilesystemActive()) {
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state_.pos_ += data.size();
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}
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return s;
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}
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Status TestWritableFile::Close() {
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writable_file_opened_ = false;
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Status s = target_->Close();
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if (s.ok()) {
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env_->WritableFileClosed(state_);
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}
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return s;
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}
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Status TestWritableFile::Flush() {
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Status s = target_->Flush();
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if (s.ok() && env_->IsFilesystemActive()) {
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state_.pos_at_last_flush_ = state_.pos_;
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}
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return s;
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}
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Status TestWritableFile::SyncParent() {
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Status s = SyncDir(GetDirName(state_.filename_));
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if (s.ok()) {
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env_->DirWasSynced();
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}
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return s;
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}
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Status TestWritableFile::Sync() {
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if (!env_->IsFilesystemActive()) {
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return Status::OK();
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}
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// Ensure new files referred to by the manifest are in the filesystem.
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Status s = target_->Sync();
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if (s.ok()) {
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state_.pos_at_last_sync_ = state_.pos_;
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}
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if (env_->IsFileCreatedSinceLastDirSync(state_.filename_)) {
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Status ps = SyncParent();
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if (s.ok() && !ps.ok()) {
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s = ps;
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}
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}
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return s;
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}
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Status FaultInjectionTestEnv::NewWritableFile(const std::string& fname,
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WritableFile** result) {
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WritableFile* actual_writable_file;
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Status s = target()->NewWritableFile(fname, &actual_writable_file);
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if (s.ok()) {
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FileState state(fname);
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state.pos_ = 0;
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*result = new TestWritableFile(state, actual_writable_file, this);
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// NewWritableFile doesn't append to files, so if the same file is
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// opened again then it will be truncated - so forget our saved
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// state.
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UntrackFile(fname);
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MutexLock l(&mutex_);
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new_files_since_last_dir_sync_.insert(fname);
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}
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return s;
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}
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Status FaultInjectionTestEnv::NewAppendableFile(const std::string& fname,
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WritableFile** result) {
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WritableFile* actual_writable_file;
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Status s = target()->NewAppendableFile(fname, &actual_writable_file);
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if (s.ok()) {
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FileState state(fname);
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state.pos_ = 0;
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{
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MutexLock l(&mutex_);
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if (db_file_state_.count(fname) == 0) {
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new_files_since_last_dir_sync_.insert(fname);
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} else {
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state = db_file_state_[fname];
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}
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}
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*result = new TestWritableFile(state, actual_writable_file, this);
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}
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return s;
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}
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Status FaultInjectionTestEnv::DropUnsyncedFileData() {
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Status s;
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MutexLock l(&mutex_);
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for (const auto& kvp : db_file_state_) {
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if (!s.ok()) {
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break;
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}
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const FileState& state = kvp.second;
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if (!state.IsFullySynced()) {
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s = state.DropUnsyncedData();
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}
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}
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return s;
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}
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void FaultInjectionTestEnv::DirWasSynced() {
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MutexLock l(&mutex_);
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new_files_since_last_dir_sync_.clear();
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}
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bool FaultInjectionTestEnv::IsFileCreatedSinceLastDirSync(
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const std::string& filename) {
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MutexLock l(&mutex_);
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return new_files_since_last_dir_sync_.find(filename) !=
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new_files_since_last_dir_sync_.end();
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}
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void FaultInjectionTestEnv::UntrackFile(const std::string& f) {
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MutexLock l(&mutex_);
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db_file_state_.erase(f);
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new_files_since_last_dir_sync_.erase(f);
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}
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Status FaultInjectionTestEnv::RemoveFile(const std::string& f) {
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Status s = EnvWrapper::RemoveFile(f);
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EXPECT_LEVELDB_OK(s);
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if (s.ok()) {
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UntrackFile(f);
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}
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return s;
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}
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Status FaultInjectionTestEnv::RenameFile(const std::string& s,
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const std::string& t) {
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Status ret = EnvWrapper::RenameFile(s, t);
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if (ret.ok()) {
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MutexLock l(&mutex_);
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if (db_file_state_.find(s) != db_file_state_.end()) {
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db_file_state_[t] = db_file_state_[s];
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db_file_state_.erase(s);
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}
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if (new_files_since_last_dir_sync_.erase(s) != 0) {
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assert(new_files_since_last_dir_sync_.find(t) ==
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new_files_since_last_dir_sync_.end());
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new_files_since_last_dir_sync_.insert(t);
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}
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}
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return ret;
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}
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void FaultInjectionTestEnv::ResetState() {
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// Since we are not destroying the database, the existing files
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// should keep their recorded synced/flushed state. Therefore
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// we do not reset db_file_state_ and new_files_since_last_dir_sync_.
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SetFilesystemActive(true);
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}
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Status FaultInjectionTestEnv::RemoveFilesCreatedAfterLastDirSync() {
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// Because RemoveFile access this container make a copy to avoid deadlock
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mutex_.Lock();
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std::set<std::string> new_files(new_files_since_last_dir_sync_.begin(),
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new_files_since_last_dir_sync_.end());
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mutex_.Unlock();
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Status status;
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for (const auto& new_file : new_files) {
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Status remove_status = RemoveFile(new_file);
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if (!remove_status.ok() && status.ok()) {
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status = std::move(remove_status);
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}
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}
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return status;
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}
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void FaultInjectionTestEnv::WritableFileClosed(const FileState& state) {
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MutexLock l(&mutex_);
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db_file_state_[state.filename_] = state;
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}
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Status FileState::DropUnsyncedData() const {
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int64_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
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return Truncate(filename_, sync_pos);
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}
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class FaultInjectionTest : public testing::Test {
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public:
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enum ExpectedVerifResult { VAL_EXPECT_NO_ERROR, VAL_EXPECT_ERROR };
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enum ResetMethod { RESET_DROP_UNSYNCED_DATA, RESET_DELETE_UNSYNCED_FILES };
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FaultInjectionTestEnv* env_;
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std::string dbname_;
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Cache* tiny_cache_;
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Options options_;
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DB* db_;
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FaultInjectionTest()
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: env_(new FaultInjectionTestEnv),
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tiny_cache_(NewLRUCache(100)),
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db_(nullptr) {
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dbname_ = testing::TempDir() + "fault_test";
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DestroyDB(dbname_, Options()); // Destroy any db from earlier run
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options_.reuse_logs = true;
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options_.env = env_;
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options_.paranoid_checks = true;
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options_.block_cache = tiny_cache_;
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options_.create_if_missing = true;
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}
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~FaultInjectionTest() {
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CloseDB();
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DestroyDB(dbname_, Options());
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delete tiny_cache_;
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delete env_;
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}
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void ReuseLogs(bool reuse) { options_.reuse_logs = reuse; }
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void Build(int start_idx, int num_vals) {
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std::string key_space, value_space;
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WriteBatch batch;
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for (int i = start_idx; i < start_idx + num_vals; i++) {
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Slice key = Key(i, &key_space);
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batch.Clear();
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batch.Put(key, Value(i, &value_space));
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WriteOptions options;
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ASSERT_LEVELDB_OK(db_->Write(options, &batch));
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}
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}
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Status ReadValue(int i, std::string* val) const {
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std::string key_space, value_space;
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Slice key = Key(i, &key_space);
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Value(i, &value_space);
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ReadOptions options;
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return db_->Get(options, key, val);
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}
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Status Verify(int start_idx, int num_vals,
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ExpectedVerifResult expected) const {
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std::string val;
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std::string value_space;
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Status s;
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for (int i = start_idx; i < start_idx + num_vals && s.ok(); i++) {
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Value(i, &value_space);
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s = ReadValue(i, &val);
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if (expected == VAL_EXPECT_NO_ERROR) {
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if (s.ok()) {
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EXPECT_EQ(value_space, val);
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}
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} else if (s.ok()) {
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std::fprintf(stderr, "Expected an error at %d, but was OK\n", i);
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s = Status::IOError(dbname_, "Expected value error:");
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} else {
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s = Status::OK(); // An expected error
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}
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}
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return s;
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}
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// Return the ith key
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Slice Key(int i, std::string* storage) const {
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char buf[100];
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std::snprintf(buf, sizeof(buf), "%016d", i);
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storage->assign(buf, strlen(buf));
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return Slice(*storage);
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}
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// Return the value to associate with the specified key
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Slice Value(int k, std::string* storage) const {
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Random r(k);
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return test::RandomString(&r, kValueSize, storage);
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}
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Status OpenDB() {
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delete db_;
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db_ = nullptr;
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env_->ResetState();
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return DB::Open(options_, dbname_, &db_);
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}
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void CloseDB() {
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delete db_;
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db_ = nullptr;
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}
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void DeleteAllData() {
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Iterator* iter = db_->NewIterator(ReadOptions());
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for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
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ASSERT_LEVELDB_OK(db_->Delete(WriteOptions(), iter->key()));
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}
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delete iter;
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}
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void ResetDBState(ResetMethod reset_method) {
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switch (reset_method) {
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case RESET_DROP_UNSYNCED_DATA:
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ASSERT_LEVELDB_OK(env_->DropUnsyncedFileData());
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break;
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case RESET_DELETE_UNSYNCED_FILES:
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ASSERT_LEVELDB_OK(env_->RemoveFilesCreatedAfterLastDirSync());
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break;
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default:
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assert(false);
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}
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}
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void PartialCompactTestPreFault(int num_pre_sync, int num_post_sync) {
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DeleteAllData();
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Build(0, num_pre_sync);
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db_->CompactRange(nullptr, nullptr);
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Build(num_pre_sync, num_post_sync);
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}
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void PartialCompactTestReopenWithFault(ResetMethod reset_method,
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int num_pre_sync, int num_post_sync) {
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env_->SetFilesystemActive(false);
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CloseDB();
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ResetDBState(reset_method);
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ASSERT_LEVELDB_OK(OpenDB());
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ASSERT_LEVELDB_OK(
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Verify(0, num_pre_sync, FaultInjectionTest::VAL_EXPECT_NO_ERROR));
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ASSERT_LEVELDB_OK(Verify(num_pre_sync, num_post_sync,
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FaultInjectionTest::VAL_EXPECT_ERROR));
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}
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void NoWriteTestPreFault() {}
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void NoWriteTestReopenWithFault(ResetMethod reset_method) {
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CloseDB();
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ResetDBState(reset_method);
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ASSERT_LEVELDB_OK(OpenDB());
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}
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void DoTest() {
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Random rnd(0);
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ASSERT_LEVELDB_OK(OpenDB());
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for (size_t idx = 0; idx < kNumIterations; idx++) {
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int num_pre_sync = rnd.Uniform(kMaxNumValues);
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int num_post_sync = rnd.Uniform(kMaxNumValues);
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PartialCompactTestPreFault(num_pre_sync, num_post_sync);
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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_F(FaultInjectionTest, FaultTestNoLogReuse) {
|
|
ReuseLogs(false);
|
|
DoTest();
|
|
}
|
|
|
|
TEST_F(FaultInjectionTest, FaultTestWithLogReuse) {
|
|
ReuseLogs(true);
|
|
DoTest();
|
|
}
|
|
|
|
} // namespace leveldb
|