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334 rivejä
8.9 KiB
334 rivejä
8.9 KiB
// Copyright (c) 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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#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/version_set.h"
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#include "db/write_batch_internal.h"
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#include "leveldb/db.h"
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#include "leveldb/env.h"
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#include "leveldb/write_batch.h"
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#include "util/logging.h"
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#include "util/testutil.h"
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namespace leveldb {
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class RecoveryTest : public testing::Test {
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public:
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RecoveryTest() : env_(Env::Default()), db_(nullptr) {
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dbname_ = testing::TempDir() + "recovery_test";
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DestroyDB(dbname_, Options());
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Open();
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}
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~RecoveryTest() {
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Close();
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DestroyDB(dbname_, Options());
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}
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DBImpl* dbfull() const { return reinterpret_cast<DBImpl*>(db_); }
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Env* env() const { return env_; }
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bool CanAppend() {
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WritableFile* tmp;
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Status s = env_->NewAppendableFile(CurrentFileName(dbname_), &tmp);
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delete tmp;
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if (s.IsNotSupportedError()) {
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return false;
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} else {
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return true;
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}
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}
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void Close() {
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delete db_;
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db_ = nullptr;
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}
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Status OpenWithStatus(Options* options = nullptr) {
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Close();
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Options opts;
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if (options != nullptr) {
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opts = *options;
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} else {
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opts.reuse_logs = true; // TODO(sanjay): test both ways
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opts.create_if_missing = true;
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}
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if (opts.env == nullptr) {
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opts.env = env_;
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}
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return DB::Open(opts, dbname_, &db_);
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}
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void Open(Options* options = nullptr) {
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ASSERT_LEVELDB_OK(OpenWithStatus(options));
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ASSERT_EQ(1, NumLogs());
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}
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Status Put(const std::string& k, const std::string& v) {
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return db_->Put(WriteOptions(), k, v);
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}
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std::string Get(const std::string& k, const Snapshot* snapshot = nullptr) {
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std::string result;
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Status s = db_->Get(ReadOptions(), k, &result);
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if (s.IsNotFound()) {
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result = "NOT_FOUND";
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} else if (!s.ok()) {
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result = s.ToString();
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}
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return result;
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}
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std::string ManifestFileName() {
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std::string current;
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EXPECT_LEVELDB_OK(
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ReadFileToString(env_, CurrentFileName(dbname_), ¤t));
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size_t len = current.size();
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if (len > 0 && current[len - 1] == '\n') {
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current.resize(len - 1);
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}
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return dbname_ + "/" + current;
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}
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std::string LogName(uint64_t number) { return LogFileName(dbname_, number); }
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size_t RemoveLogFiles() {
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// Linux allows unlinking open files, but Windows does not.
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// Closing the db allows for file deletion.
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Close();
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std::vector<uint64_t> logs = GetFiles(kLogFile);
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for (size_t i = 0; i < logs.size(); i++) {
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EXPECT_LEVELDB_OK(env_->RemoveFile(LogName(logs[i]))) << LogName(logs[i]);
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}
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return logs.size();
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}
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void RemoveManifestFile() {
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ASSERT_LEVELDB_OK(env_->RemoveFile(ManifestFileName()));
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}
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uint64_t FirstLogFile() { return GetFiles(kLogFile)[0]; }
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std::vector<uint64_t> GetFiles(FileType t) {
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std::vector<std::string> filenames;
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EXPECT_LEVELDB_OK(env_->GetChildren(dbname_, &filenames));
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std::vector<uint64_t> result;
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for (size_t i = 0; i < filenames.size(); i++) {
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uint64_t number;
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FileType type;
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if (ParseFileName(filenames[i], &number, &type) && type == t) {
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result.push_back(number);
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}
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}
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return result;
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}
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int NumLogs() { return GetFiles(kLogFile).size(); }
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int NumTables() { return GetFiles(kTableFile).size(); }
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uint64_t FileSize(const std::string& fname) {
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uint64_t result;
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EXPECT_LEVELDB_OK(env_->GetFileSize(fname, &result)) << fname;
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return result;
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}
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void CompactMemTable() { dbfull()->TEST_CompactMemTable(); }
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// Directly construct a log file that sets key to val.
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void MakeLogFile(uint64_t lognum, SequenceNumber seq, Slice key, Slice val) {
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std::string fname = LogFileName(dbname_, lognum);
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WritableFile* file;
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ASSERT_LEVELDB_OK(env_->NewWritableFile(fname, &file));
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log::Writer writer(file);
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WriteBatch batch;
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batch.Put(key, val);
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WriteBatchInternal::SetSequence(&batch, seq);
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ASSERT_LEVELDB_OK(writer.AddRecord(WriteBatchInternal::Contents(&batch)));
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ASSERT_LEVELDB_OK(file->Flush());
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delete file;
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}
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private:
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std::string dbname_;
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Env* env_;
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DB* db_;
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};
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TEST_F(RecoveryTest, ManifestReused) {
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if (!CanAppend()) {
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std::fprintf(stderr,
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"skipping test because env does not support appending\n");
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return;
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}
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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Close();
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std::string old_manifest = ManifestFileName();
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Open();
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ASSERT_EQ(old_manifest, ManifestFileName());
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ASSERT_EQ("bar", Get("foo"));
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Open();
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ASSERT_EQ(old_manifest, ManifestFileName());
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ASSERT_EQ("bar", Get("foo"));
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}
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TEST_F(RecoveryTest, LargeManifestCompacted) {
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if (!CanAppend()) {
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std::fprintf(stderr,
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"skipping test because env does not support appending\n");
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return;
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}
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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Close();
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std::string old_manifest = ManifestFileName();
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// Pad with zeroes to make manifest file very big.
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{
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uint64_t len = FileSize(old_manifest);
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WritableFile* file;
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ASSERT_LEVELDB_OK(env()->NewAppendableFile(old_manifest, &file));
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std::string zeroes(3 * 1048576 - static_cast<size_t>(len), 0);
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ASSERT_LEVELDB_OK(file->Append(zeroes));
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ASSERT_LEVELDB_OK(file->Flush());
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delete file;
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}
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Open();
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std::string new_manifest = ManifestFileName();
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ASSERT_NE(old_manifest, new_manifest);
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ASSERT_GT(10000, FileSize(new_manifest));
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ASSERT_EQ("bar", Get("foo"));
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Open();
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ASSERT_EQ(new_manifest, ManifestFileName());
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ASSERT_EQ("bar", Get("foo"));
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}
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TEST_F(RecoveryTest, NoLogFiles) {
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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ASSERT_EQ(1, RemoveLogFiles());
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Open();
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ASSERT_EQ("NOT_FOUND", Get("foo"));
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Open();
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ASSERT_EQ("NOT_FOUND", Get("foo"));
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}
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TEST_F(RecoveryTest, LogFileReuse) {
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if (!CanAppend()) {
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std::fprintf(stderr,
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"skipping test because env does not support appending\n");
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return;
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}
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for (int i = 0; i < 2; i++) {
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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if (i == 0) {
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// Compact to ensure current log is empty
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CompactMemTable();
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}
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Close();
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ASSERT_EQ(1, NumLogs());
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uint64_t number = FirstLogFile();
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if (i == 0) {
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ASSERT_EQ(0, FileSize(LogName(number)));
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} else {
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ASSERT_LT(0, FileSize(LogName(number)));
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}
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Open();
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ASSERT_EQ(1, NumLogs());
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ASSERT_EQ(number, FirstLogFile()) << "did not reuse log file";
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ASSERT_EQ("bar", Get("foo"));
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Open();
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ASSERT_EQ(1, NumLogs());
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ASSERT_EQ(number, FirstLogFile()) << "did not reuse log file";
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ASSERT_EQ("bar", Get("foo"));
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}
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}
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TEST_F(RecoveryTest, MultipleMemTables) {
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// Make a large log.
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const int kNum = 1000;
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for (int i = 0; i < kNum; i++) {
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char buf[100];
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std::snprintf(buf, sizeof(buf), "%050d", i);
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ASSERT_LEVELDB_OK(Put(buf, buf));
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}
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ASSERT_EQ(0, NumTables());
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Close();
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ASSERT_EQ(0, NumTables());
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ASSERT_EQ(1, NumLogs());
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uint64_t old_log_file = FirstLogFile();
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// Force creation of multiple memtables by reducing the write buffer size.
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Options opt;
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opt.reuse_logs = true;
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opt.write_buffer_size = (kNum * 100) / 2;
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Open(&opt);
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ASSERT_LE(2, NumTables());
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ASSERT_EQ(1, NumLogs());
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ASSERT_NE(old_log_file, FirstLogFile()) << "must not reuse log";
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for (int i = 0; i < kNum; i++) {
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char buf[100];
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std::snprintf(buf, sizeof(buf), "%050d", i);
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ASSERT_EQ(buf, Get(buf));
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}
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}
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TEST_F(RecoveryTest, MultipleLogFiles) {
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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Close();
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ASSERT_EQ(1, NumLogs());
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// Make a bunch of uncompacted log files.
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uint64_t old_log = FirstLogFile();
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MakeLogFile(old_log + 1, 1000, "hello", "world");
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MakeLogFile(old_log + 2, 1001, "hi", "there");
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MakeLogFile(old_log + 3, 1002, "foo", "bar2");
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// Recover and check that all log files were processed.
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Open();
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ASSERT_LE(1, NumTables());
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ASSERT_EQ(1, NumLogs());
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uint64_t new_log = FirstLogFile();
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ASSERT_LE(old_log + 3, new_log);
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ASSERT_EQ("bar2", Get("foo"));
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ASSERT_EQ("world", Get("hello"));
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ASSERT_EQ("there", Get("hi"));
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// Test that previous recovery produced recoverable state.
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Open();
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ASSERT_LE(1, NumTables());
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ASSERT_EQ(1, NumLogs());
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if (CanAppend()) {
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ASSERT_EQ(new_log, FirstLogFile());
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}
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ASSERT_EQ("bar2", Get("foo"));
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ASSERT_EQ("world", Get("hello"));
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ASSERT_EQ("there", Get("hi"));
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// Check that introducing an older log file does not cause it to be re-read.
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Close();
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MakeLogFile(old_log + 1, 2000, "hello", "stale write");
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Open();
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ASSERT_LE(1, NumTables());
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ASSERT_EQ(1, NumLogs());
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if (CanAppend()) {
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ASSERT_EQ(new_log, FirstLogFile());
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}
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ASSERT_EQ("bar2", Get("foo"));
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ASSERT_EQ("world", Get("hello"));
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ASSERT_EQ("there", Get("hi"));
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}
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TEST_F(RecoveryTest, ManifestMissing) {
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ASSERT_LEVELDB_OK(Put("foo", "bar"));
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Close();
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RemoveManifestFile();
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Status status = OpenWithStatus();
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ASSERT_TRUE(status.IsCorruption());
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}
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} // namespace leveldb
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