589ea6bec2
Summary: This API can be used for things like determining how much space can be freed up by deleting a particular backup, etc. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8042 Test Plan: validation of the API added to many existing backup unit tests Reviewed By: mrambacher Differential Revision: D26936577 Pulled By: pdillinger fbshipit-source-id: f0bbd90f0917b9781a6837652fb4616d9247816a
2374 lines
88 KiB
C++
2374 lines
88 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 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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#ifndef ROCKSDB_LITE
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#include "rocksdb/utilities/backupable_db.h"
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#include <stdlib.h>
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#include <algorithm>
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#include <atomic>
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#include <cinttypes>
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#include <functional>
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#include <future>
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#include <limits>
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#include <map>
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#include <mutex>
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#include <sstream>
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#include <string>
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#include <thread>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "env/composite_env_wrapper.h"
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#include "file/filename.h"
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#include "file/line_file_reader.h"
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#include "file/sequence_file_reader.h"
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#include "file/writable_file_writer.h"
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#include "logging/logging.h"
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#include "port/port.h"
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#include "rocksdb/rate_limiter.h"
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#include "rocksdb/transaction_log.h"
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#include "table/sst_file_dumper.h"
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#include "test_util/sync_point.h"
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#include "util/channel.h"
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#include "util/coding.h"
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#include "util/crc32c.h"
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#include "util/string_util.h"
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#include "utilities/checkpoint/checkpoint_impl.h"
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namespace ROCKSDB_NAMESPACE {
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namespace {
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using ShareFilesNaming = BackupableDBOptions::ShareFilesNaming;
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inline uint32_t ChecksumHexToInt32(const std::string& checksum_hex) {
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std::string checksum_str;
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Slice(checksum_hex).DecodeHex(&checksum_str);
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return EndianSwapValue(DecodeFixed32(checksum_str.c_str()));
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}
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inline std::string ChecksumStrToHex(const std::string& checksum_str) {
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return Slice(checksum_str).ToString(true);
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}
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inline std::string ChecksumInt32ToHex(const uint32_t& checksum_value) {
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std::string checksum_str;
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PutFixed32(&checksum_str, EndianSwapValue(checksum_value));
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return ChecksumStrToHex(checksum_str);
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}
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} // namespace
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void BackupStatistics::IncrementNumberSuccessBackup() {
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number_success_backup++;
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}
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void BackupStatistics::IncrementNumberFailBackup() {
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number_fail_backup++;
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}
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uint32_t BackupStatistics::GetNumberSuccessBackup() const {
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return number_success_backup;
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}
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uint32_t BackupStatistics::GetNumberFailBackup() const {
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return number_fail_backup;
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}
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std::string BackupStatistics::ToString() const {
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char result[50];
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snprintf(result, sizeof(result), "# success backup: %u, # fail backup: %u",
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GetNumberSuccessBackup(), GetNumberFailBackup());
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return result;
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}
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void BackupableDBOptions::Dump(Logger* logger) const {
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ROCKS_LOG_INFO(logger, " Options.backup_dir: %s",
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backup_dir.c_str());
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ROCKS_LOG_INFO(logger, " Options.backup_env: %p", backup_env);
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ROCKS_LOG_INFO(logger, " Options.share_table_files: %d",
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static_cast<int>(share_table_files));
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ROCKS_LOG_INFO(logger, " Options.info_log: %p", info_log);
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ROCKS_LOG_INFO(logger, " Options.sync: %d",
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static_cast<int>(sync));
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ROCKS_LOG_INFO(logger, " Options.destroy_old_data: %d",
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static_cast<int>(destroy_old_data));
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ROCKS_LOG_INFO(logger, " Options.backup_log_files: %d",
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static_cast<int>(backup_log_files));
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ROCKS_LOG_INFO(logger, " Options.backup_rate_limit: %" PRIu64,
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backup_rate_limit);
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ROCKS_LOG_INFO(logger, " Options.restore_rate_limit: %" PRIu64,
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restore_rate_limit);
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ROCKS_LOG_INFO(logger, "Options.max_background_operations: %d",
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max_background_operations);
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}
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// -------- BackupEngineImpl class ---------
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class BackupEngineImpl : public BackupEngine {
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public:
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BackupEngineImpl(const BackupableDBOptions& options, Env* db_env,
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bool read_only = false);
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~BackupEngineImpl() override;
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using BackupEngine::CreateNewBackupWithMetadata;
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Status CreateNewBackupWithMetadata(const CreateBackupOptions& options, DB* db,
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const std::string& app_metadata) override;
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Status PurgeOldBackups(uint32_t num_backups_to_keep) override;
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Status DeleteBackup(BackupID backup_id) override;
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void StopBackup() override {
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stop_backup_.store(true, std::memory_order_release);
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}
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Status GarbageCollect() override;
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// The returned BackupInfos are in chronological order, which means the
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// latest backup comes last.
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void GetBackupInfo(std::vector<BackupInfo>* backup_info,
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bool include_file_details) const override;
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void GetCorruptedBackups(
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std::vector<BackupID>* corrupt_backup_ids) const override;
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using BackupEngine::RestoreDBFromBackup;
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Status RestoreDBFromBackup(const RestoreOptions& options, BackupID backup_id,
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const std::string& db_dir,
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const std::string& wal_dir) override;
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using BackupEngine::RestoreDBFromLatestBackup;
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Status RestoreDBFromLatestBackup(const RestoreOptions& options,
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const std::string& db_dir,
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const std::string& wal_dir) override {
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return RestoreDBFromBackup(options, latest_valid_backup_id_, db_dir,
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wal_dir);
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}
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Status VerifyBackup(BackupID backup_id,
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bool verify_with_checksum = false) override;
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Status Initialize();
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ShareFilesNaming GetNamingNoFlags() const {
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return options_.share_files_with_checksum_naming &
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BackupableDBOptions::kMaskNoNamingFlags;
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}
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ShareFilesNaming GetNamingFlags() const {
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return options_.share_files_with_checksum_naming &
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BackupableDBOptions::kMaskNamingFlags;
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}
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private:
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void DeleteChildren(const std::string& dir, uint32_t file_type_filter = 0);
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Status DeleteBackupInternal(BackupID backup_id);
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// Extends the "result" map with pathname->size mappings for the contents of
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// "dir" in "env". Pathnames are prefixed with "dir".
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Status InsertPathnameToSizeBytes(
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const std::string& dir, Env* env,
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std::unordered_map<std::string, uint64_t>* result);
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struct FileInfo {
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FileInfo(const std::string& fname, uint64_t sz, const std::string& checksum,
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const std::string& id = "", const std::string& sid = "")
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: refs(0),
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filename(fname),
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size(sz),
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checksum_hex(checksum),
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db_id(id),
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db_session_id(sid) {}
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FileInfo(const FileInfo&) = delete;
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FileInfo& operator=(const FileInfo&) = delete;
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int refs;
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const std::string filename;
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const uint64_t size;
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const std::string checksum_hex;
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// DB identities
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// db_id is obtained for potential usage in the future but not used
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// currently
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const std::string db_id;
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// db_session_id appears in the backup SST filename if the table naming
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// option is kUseDbSessionId
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const std::string db_session_id;
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};
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class BackupMeta {
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public:
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BackupMeta(
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const std::string& meta_filename, const std::string& meta_tmp_filename,
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std::unordered_map<std::string, std::shared_ptr<FileInfo>>* file_infos,
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Env* env)
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: timestamp_(0),
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sequence_number_(0),
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size_(0),
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meta_filename_(meta_filename),
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meta_tmp_filename_(meta_tmp_filename),
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file_infos_(file_infos),
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env_(env) {}
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BackupMeta(const BackupMeta&) = delete;
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BackupMeta& operator=(const BackupMeta&) = delete;
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~BackupMeta() {}
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Status RecordTimestamp() { return env_->GetCurrentTime(×tamp_); }
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int64_t GetTimestamp() const {
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return timestamp_;
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}
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uint64_t GetSize() const {
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return size_;
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}
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uint32_t GetNumberFiles() const {
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return static_cast<uint32_t>(files_.size());
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}
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void SetSequenceNumber(uint64_t sequence_number) {
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sequence_number_ = sequence_number;
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}
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uint64_t GetSequenceNumber() const { return sequence_number_; }
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const std::string& GetAppMetadata() const { return app_metadata_; }
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void SetAppMetadata(const std::string& app_metadata) {
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app_metadata_ = app_metadata;
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}
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Status AddFile(std::shared_ptr<FileInfo> file_info);
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Status Delete(bool delete_meta = true);
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bool Empty() const { return files_.empty(); }
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std::shared_ptr<FileInfo> GetFile(const std::string& filename) const {
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auto it = file_infos_->find(filename);
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if (it == file_infos_->end())
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return nullptr;
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return it->second;
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}
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const std::vector<std::shared_ptr<FileInfo>>& GetFiles() const {
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return files_;
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}
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// @param abs_path_to_size Pre-fetched file sizes (bytes).
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Status LoadFromFile(
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const std::string& backup_dir,
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const std::unordered_map<std::string, uint64_t>& abs_path_to_size);
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Status StoreToFile(bool sync);
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std::string GetInfoString() {
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std::ostringstream ss;
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ss << "Timestamp: " << timestamp_ << std::endl;
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char human_size[16];
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AppendHumanBytes(size_, human_size, sizeof(human_size));
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ss << "Size: " << human_size << std::endl;
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ss << "Files:" << std::endl;
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for (const auto& file : files_) {
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AppendHumanBytes(file->size, human_size, sizeof(human_size));
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ss << file->filename << ", size " << human_size << ", refs "
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<< file->refs << std::endl;
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}
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return ss.str();
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}
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private:
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int64_t timestamp_;
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// sequence number is only approximate, should not be used
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// by clients
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uint64_t sequence_number_;
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uint64_t size_;
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std::string app_metadata_;
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std::string const meta_filename_;
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std::string const meta_tmp_filename_;
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// files with relative paths (without "/" prefix!!)
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std::vector<std::shared_ptr<FileInfo>> files_;
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std::unordered_map<std::string, std::shared_ptr<FileInfo>>* file_infos_;
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Env* env_;
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}; // BackupMeta
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inline std::string GetAbsolutePath(
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const std::string &relative_path = "") const {
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assert(relative_path.size() == 0 || relative_path[0] != '/');
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return options_.backup_dir + "/" + relative_path;
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}
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inline std::string GetPrivateDirRel() const {
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return "private";
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}
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inline std::string GetSharedDirRel() const { return "shared"; }
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inline std::string GetSharedChecksumDirRel() const {
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return "shared_checksum";
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}
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inline std::string GetPrivateFileRel(BackupID backup_id,
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bool tmp = false,
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const std::string& file = "") const {
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assert(file.size() == 0 || file[0] != '/');
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return GetPrivateDirRel() + "/" + ROCKSDB_NAMESPACE::ToString(backup_id) +
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(tmp ? ".tmp" : "") + "/" + file;
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}
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inline std::string GetSharedFileRel(const std::string& file = "",
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bool tmp = false) const {
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assert(file.size() == 0 || file[0] != '/');
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return GetSharedDirRel() + "/" + (tmp ? "." : "") + file +
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(tmp ? ".tmp" : "");
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}
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inline std::string GetSharedFileWithChecksumRel(const std::string& file = "",
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bool tmp = false) const {
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assert(file.size() == 0 || file[0] != '/');
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return GetSharedChecksumDirRel() + "/" + (tmp ? "." : "") + file +
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(tmp ? ".tmp" : "");
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}
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inline bool UseLegacyNaming(const std::string& sid) const {
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return GetNamingNoFlags() ==
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BackupableDBOptions::kLegacyCrc32cAndFileSize ||
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sid.empty();
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}
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inline std::string GetSharedFileWithChecksum(
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const std::string& file, bool has_checksum,
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const std::string& checksum_hex, const uint64_t file_size,
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const std::string& db_session_id) const {
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assert(file.size() == 0 || file[0] != '/');
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std::string file_copy = file;
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if (UseLegacyNaming(db_session_id)) {
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assert(has_checksum);
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(void)has_checksum;
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file_copy.insert(file_copy.find_last_of('.'),
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"_" + ToString(ChecksumHexToInt32(checksum_hex)) + "_" +
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ToString(file_size));
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} else {
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file_copy.insert(file_copy.find_last_of('.'), "_s" + db_session_id);
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if (GetNamingFlags() & BackupableDBOptions::kFlagIncludeFileSize) {
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file_copy.insert(file_copy.find_last_of('.'),
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"_" + ToString(file_size));
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}
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}
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return file_copy;
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}
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inline std::string GetFileFromChecksumFile(const std::string& file) const {
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assert(file.size() == 0 || file[0] != '/');
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std::string file_copy = file;
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size_t first_underscore = file_copy.find_first_of('_');
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return file_copy.erase(first_underscore,
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file_copy.find_last_of('.') - first_underscore);
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}
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inline std::string GetBackupMetaDir() const {
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return GetAbsolutePath("meta");
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}
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inline std::string GetBackupMetaFile(BackupID backup_id, bool tmp) const {
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return GetBackupMetaDir() + "/" + (tmp ? "." : "") +
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ROCKSDB_NAMESPACE::ToString(backup_id) + (tmp ? ".tmp" : "");
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}
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// If size_limit == 0, there is no size limit, copy everything.
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//
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// Exactly one of src and contents must be non-empty.
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//
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// @param src If non-empty, the file is copied from this pathname.
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// @param contents If non-empty, the file will be created with these contents.
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Status CopyOrCreateFile(const std::string& src, const std::string& dst,
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const std::string& contents, Env* src_env,
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Env* dst_env, const EnvOptions& src_env_options,
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bool sync, RateLimiter* rate_limiter,
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uint64_t* size = nullptr,
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std::string* checksum_hex = nullptr,
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uint64_t size_limit = 0,
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std::function<void()> progress_callback = []() {});
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Status ReadFileAndComputeChecksum(const std::string& src, Env* src_env,
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const EnvOptions& src_env_options,
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uint64_t size_limit,
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std::string* checksum_hex);
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// Obtain db_id and db_session_id from the table properties of file_path
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Status GetFileDbIdentities(Env* src_env, const EnvOptions& src_env_options,
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const std::string& file_path, std::string* db_id,
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std::string* db_session_id);
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struct CopyOrCreateResult {
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~CopyOrCreateResult() {
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// The Status needs to be ignored here for two reasons.
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// First, if the BackupEngineImpl shuts down with jobs outstanding, then
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// it is possible that the Status in the future/promise is never read,
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// resulting in an unchecked Status. Second, if there are items in the
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// channel when the BackupEngineImpl is shutdown, these will also have
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// Status that have not been checked. This
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// TODO: Fix those issues so that the Status
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status.PermitUncheckedError();
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}
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uint64_t size;
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std::string checksum_hex;
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std::string db_id;
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std::string db_session_id;
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Status status;
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};
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// Exactly one of src_path and contents must be non-empty. If src_path is
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// non-empty, the file is copied from this pathname. Otherwise, if contents is
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// non-empty, the file will be created at dst_path with these contents.
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struct CopyOrCreateWorkItem {
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std::string src_path;
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std::string dst_path;
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std::string contents;
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Env* src_env;
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Env* dst_env;
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EnvOptions src_env_options;
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bool sync;
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RateLimiter* rate_limiter;
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uint64_t size_limit;
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std::promise<CopyOrCreateResult> result;
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std::function<void()> progress_callback;
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bool verify_checksum_after_work;
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std::string src_checksum_func_name;
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std::string src_checksum_hex;
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std::string db_id;
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std::string db_session_id;
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CopyOrCreateWorkItem()
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: src_path(""),
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dst_path(""),
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contents(""),
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src_env(nullptr),
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dst_env(nullptr),
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src_env_options(),
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sync(false),
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rate_limiter(nullptr),
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size_limit(0),
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verify_checksum_after_work(false),
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src_checksum_func_name(kUnknownFileChecksumFuncName),
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src_checksum_hex(""),
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db_id(""),
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db_session_id("") {}
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CopyOrCreateWorkItem(const CopyOrCreateWorkItem&) = delete;
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CopyOrCreateWorkItem& operator=(const CopyOrCreateWorkItem&) = delete;
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CopyOrCreateWorkItem(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
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*this = std::move(o);
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}
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CopyOrCreateWorkItem& operator=(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
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src_path = std::move(o.src_path);
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dst_path = std::move(o.dst_path);
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contents = std::move(o.contents);
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src_env = o.src_env;
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dst_env = o.dst_env;
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src_env_options = std::move(o.src_env_options);
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sync = o.sync;
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rate_limiter = o.rate_limiter;
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size_limit = o.size_limit;
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result = std::move(o.result);
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progress_callback = std::move(o.progress_callback);
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verify_checksum_after_work = o.verify_checksum_after_work;
|
|
src_checksum_func_name = std::move(o.src_checksum_func_name);
|
|
src_checksum_hex = std::move(o.src_checksum_hex);
|
|
db_id = std::move(o.db_id);
|
|
db_session_id = std::move(o.db_session_id);
|
|
return *this;
|
|
}
|
|
|
|
CopyOrCreateWorkItem(
|
|
std::string _src_path, std::string _dst_path, std::string _contents,
|
|
Env* _src_env, Env* _dst_env, EnvOptions _src_env_options, bool _sync,
|
|
RateLimiter* _rate_limiter, uint64_t _size_limit,
|
|
std::function<void()> _progress_callback = []() {},
|
|
bool _verify_checksum_after_work = false,
|
|
const std::string& _src_checksum_func_name =
|
|
kUnknownFileChecksumFuncName,
|
|
const std::string& _src_checksum_hex = "",
|
|
const std::string& _db_id = "", const std::string& _db_session_id = "")
|
|
: src_path(std::move(_src_path)),
|
|
dst_path(std::move(_dst_path)),
|
|
contents(std::move(_contents)),
|
|
src_env(_src_env),
|
|
dst_env(_dst_env),
|
|
src_env_options(std::move(_src_env_options)),
|
|
sync(_sync),
|
|
rate_limiter(_rate_limiter),
|
|
size_limit(_size_limit),
|
|
progress_callback(_progress_callback),
|
|
verify_checksum_after_work(_verify_checksum_after_work),
|
|
src_checksum_func_name(_src_checksum_func_name),
|
|
src_checksum_hex(_src_checksum_hex),
|
|
db_id(_db_id),
|
|
db_session_id(_db_session_id) {}
|
|
};
|
|
|
|
struct BackupAfterCopyOrCreateWorkItem {
|
|
std::future<CopyOrCreateResult> result;
|
|
bool shared;
|
|
bool needed_to_copy;
|
|
Env* backup_env;
|
|
std::string dst_path_tmp;
|
|
std::string dst_path;
|
|
std::string dst_relative;
|
|
BackupAfterCopyOrCreateWorkItem()
|
|
: shared(false),
|
|
needed_to_copy(false),
|
|
backup_env(nullptr),
|
|
dst_path_tmp(""),
|
|
dst_path(""),
|
|
dst_relative("") {}
|
|
|
|
BackupAfterCopyOrCreateWorkItem(BackupAfterCopyOrCreateWorkItem&& o)
|
|
ROCKSDB_NOEXCEPT {
|
|
*this = std::move(o);
|
|
}
|
|
|
|
BackupAfterCopyOrCreateWorkItem& operator=(
|
|
BackupAfterCopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
|
|
result = std::move(o.result);
|
|
shared = o.shared;
|
|
needed_to_copy = o.needed_to_copy;
|
|
backup_env = o.backup_env;
|
|
dst_path_tmp = std::move(o.dst_path_tmp);
|
|
dst_path = std::move(o.dst_path);
|
|
dst_relative = std::move(o.dst_relative);
|
|
return *this;
|
|
}
|
|
|
|
BackupAfterCopyOrCreateWorkItem(std::future<CopyOrCreateResult>&& _result,
|
|
bool _shared, bool _needed_to_copy,
|
|
Env* _backup_env, std::string _dst_path_tmp,
|
|
std::string _dst_path,
|
|
std::string _dst_relative)
|
|
: result(std::move(_result)),
|
|
shared(_shared),
|
|
needed_to_copy(_needed_to_copy),
|
|
backup_env(_backup_env),
|
|
dst_path_tmp(std::move(_dst_path_tmp)),
|
|
dst_path(std::move(_dst_path)),
|
|
dst_relative(std::move(_dst_relative)) {}
|
|
};
|
|
|
|
struct RestoreAfterCopyOrCreateWorkItem {
|
|
std::future<CopyOrCreateResult> result;
|
|
std::string checksum_hex;
|
|
RestoreAfterCopyOrCreateWorkItem() : checksum_hex("") {}
|
|
RestoreAfterCopyOrCreateWorkItem(std::future<CopyOrCreateResult>&& _result,
|
|
const std::string& _checksum_hex)
|
|
: result(std::move(_result)), checksum_hex(_checksum_hex) {}
|
|
RestoreAfterCopyOrCreateWorkItem(RestoreAfterCopyOrCreateWorkItem&& o)
|
|
ROCKSDB_NOEXCEPT {
|
|
*this = std::move(o);
|
|
}
|
|
|
|
RestoreAfterCopyOrCreateWorkItem& operator=(
|
|
RestoreAfterCopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
|
|
result = std::move(o.result);
|
|
checksum_hex = std::move(o.checksum_hex);
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
bool initialized_;
|
|
std::mutex byte_report_mutex_;
|
|
channel<CopyOrCreateWorkItem> files_to_copy_or_create_;
|
|
std::vector<port::Thread> threads_;
|
|
std::atomic<CpuPriority> threads_cpu_priority_;
|
|
// Certain operations like PurgeOldBackups and DeleteBackup will trigger
|
|
// automatic GarbageCollect (true) unless we've already done one in this
|
|
// session and have not failed to delete backup files since then (false).
|
|
bool might_need_garbage_collect_ = true;
|
|
|
|
// Adds a file to the backup work queue to be copied or created if it doesn't
|
|
// already exist.
|
|
//
|
|
// Exactly one of src_dir and contents must be non-empty.
|
|
//
|
|
// @param src_dir If non-empty, the file in this directory named fname will be
|
|
// copied.
|
|
// @param fname Name of destination file and, in case of copy, source file.
|
|
// @param contents If non-empty, the file will be created with these contents.
|
|
Status AddBackupFileWorkItem(
|
|
std::unordered_set<std::string>& live_dst_paths,
|
|
std::vector<BackupAfterCopyOrCreateWorkItem>& backup_items_to_finish,
|
|
BackupID backup_id, bool shared, const std::string& src_dir,
|
|
const std::string& fname, // starts with "/"
|
|
const EnvOptions& src_env_options, RateLimiter* rate_limiter,
|
|
uint64_t size_bytes, uint64_t size_limit = 0,
|
|
bool shared_checksum = false,
|
|
std::function<void()> progress_callback = []() {},
|
|
const std::string& contents = std::string(),
|
|
const std::string& src_checksum_func_name = kUnknownFileChecksumFuncName,
|
|
const std::string& src_checksum_str = kUnknownFileChecksum);
|
|
|
|
// backup state data
|
|
BackupID latest_backup_id_;
|
|
BackupID latest_valid_backup_id_;
|
|
std::map<BackupID, std::unique_ptr<BackupMeta>> backups_;
|
|
std::map<BackupID, std::pair<Status, std::unique_ptr<BackupMeta>>>
|
|
corrupt_backups_;
|
|
std::unordered_map<std::string,
|
|
std::shared_ptr<FileInfo>> backuped_file_infos_;
|
|
std::atomic<bool> stop_backup_;
|
|
|
|
// options data
|
|
BackupableDBOptions options_;
|
|
Env* db_env_;
|
|
Env* backup_env_;
|
|
|
|
// directories
|
|
std::unique_ptr<Directory> backup_directory_;
|
|
std::unique_ptr<Directory> shared_directory_;
|
|
std::unique_ptr<Directory> meta_directory_;
|
|
std::unique_ptr<Directory> private_directory_;
|
|
|
|
static const size_t kDefaultCopyFileBufferSize = 5 * 1024 * 1024LL; // 5MB
|
|
size_t copy_file_buffer_size_;
|
|
bool read_only_;
|
|
BackupStatistics backup_statistics_;
|
|
static const size_t kMaxAppMetaSize = 1024 * 1024; // 1MB
|
|
};
|
|
|
|
Status BackupEngine::Open(const BackupableDBOptions& options, Env* env,
|
|
BackupEngine** backup_engine_ptr) {
|
|
std::unique_ptr<BackupEngineImpl> backup_engine(
|
|
new BackupEngineImpl(options, env));
|
|
auto s = backup_engine->Initialize();
|
|
if (!s.ok()) {
|
|
*backup_engine_ptr = nullptr;
|
|
return s;
|
|
}
|
|
*backup_engine_ptr = backup_engine.release();
|
|
return Status::OK();
|
|
}
|
|
|
|
BackupEngineImpl::BackupEngineImpl(const BackupableDBOptions& options,
|
|
Env* db_env, bool read_only)
|
|
: initialized_(false),
|
|
threads_cpu_priority_(),
|
|
latest_backup_id_(0),
|
|
latest_valid_backup_id_(0),
|
|
stop_backup_(false),
|
|
options_(options),
|
|
db_env_(db_env),
|
|
backup_env_(options.backup_env != nullptr ? options.backup_env : db_env_),
|
|
copy_file_buffer_size_(kDefaultCopyFileBufferSize),
|
|
read_only_(read_only) {
|
|
if (options_.backup_rate_limiter == nullptr &&
|
|
options_.backup_rate_limit > 0) {
|
|
options_.backup_rate_limiter.reset(
|
|
NewGenericRateLimiter(options_.backup_rate_limit));
|
|
}
|
|
if (options_.restore_rate_limiter == nullptr &&
|
|
options_.restore_rate_limit > 0) {
|
|
options_.restore_rate_limiter.reset(
|
|
NewGenericRateLimiter(options_.restore_rate_limit));
|
|
}
|
|
}
|
|
|
|
BackupEngineImpl::~BackupEngineImpl() {
|
|
files_to_copy_or_create_.sendEof();
|
|
for (auto& t : threads_) {
|
|
t.join();
|
|
}
|
|
LogFlush(options_.info_log);
|
|
for (const auto& it : corrupt_backups_) {
|
|
it.second.first.PermitUncheckedError();
|
|
}
|
|
}
|
|
|
|
Status BackupEngineImpl::Initialize() {
|
|
assert(!initialized_);
|
|
initialized_ = true;
|
|
if (read_only_) {
|
|
ROCKS_LOG_INFO(options_.info_log, "Starting read_only backup engine");
|
|
}
|
|
options_.Dump(options_.info_log);
|
|
|
|
if (!read_only_) {
|
|
// we might need to clean up from previous crash or I/O errors
|
|
might_need_garbage_collect_ = true;
|
|
|
|
if (options_.max_valid_backups_to_open != port::kMaxInt32) {
|
|
options_.max_valid_backups_to_open = port::kMaxInt32;
|
|
ROCKS_LOG_WARN(
|
|
options_.info_log,
|
|
"`max_valid_backups_to_open` is not set to the default value. Ignoring "
|
|
"its value since BackupEngine is not read-only.");
|
|
}
|
|
|
|
// gather the list of directories that we need to create
|
|
std::vector<std::pair<std::string, std::unique_ptr<Directory>*>>
|
|
directories;
|
|
directories.emplace_back(GetAbsolutePath(), &backup_directory_);
|
|
if (options_.share_table_files) {
|
|
if (options_.share_files_with_checksum) {
|
|
directories.emplace_back(
|
|
GetAbsolutePath(GetSharedFileWithChecksumRel()),
|
|
&shared_directory_);
|
|
} else {
|
|
directories.emplace_back(GetAbsolutePath(GetSharedFileRel()),
|
|
&shared_directory_);
|
|
}
|
|
}
|
|
directories.emplace_back(GetAbsolutePath(GetPrivateDirRel()),
|
|
&private_directory_);
|
|
directories.emplace_back(GetBackupMetaDir(), &meta_directory_);
|
|
// create all the dirs we need
|
|
for (const auto& d : directories) {
|
|
auto s = backup_env_->CreateDirIfMissing(d.first);
|
|
if (s.ok()) {
|
|
s = backup_env_->NewDirectory(d.first, d.second);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::vector<std::string> backup_meta_files;
|
|
{
|
|
auto s = backup_env_->GetChildren(GetBackupMetaDir(), &backup_meta_files);
|
|
if (s.IsNotFound()) {
|
|
return Status::NotFound(GetBackupMetaDir() + " is missing");
|
|
} else if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
// create backups_ structure
|
|
for (auto& file : backup_meta_files) {
|
|
ROCKS_LOG_INFO(options_.info_log, "Detected backup %s", file.c_str());
|
|
BackupID backup_id = 0;
|
|
sscanf(file.c_str(), "%u", &backup_id);
|
|
if (backup_id == 0 || file != ROCKSDB_NAMESPACE::ToString(backup_id)) {
|
|
if (!read_only_) {
|
|
// invalid file name, delete that
|
|
auto s = backup_env_->DeleteFile(GetBackupMetaDir() + "/" + file);
|
|
ROCKS_LOG_INFO(options_.info_log,
|
|
"Unrecognized meta file %s, deleting -- %s",
|
|
file.c_str(), s.ToString().c_str());
|
|
}
|
|
continue;
|
|
}
|
|
assert(backups_.find(backup_id) == backups_.end());
|
|
// Insert all the (backup_id, BackupMeta) that will be loaded later
|
|
// The loading performed later will check whether there are corrupt backups
|
|
// and move the corrupt backups to corrupt_backups_
|
|
backups_.insert(std::make_pair(
|
|
backup_id, std::unique_ptr<BackupMeta>(new BackupMeta(
|
|
GetBackupMetaFile(backup_id, false /* tmp */),
|
|
GetBackupMetaFile(backup_id, true /* tmp */),
|
|
&backuped_file_infos_, backup_env_))));
|
|
}
|
|
|
|
latest_backup_id_ = 0;
|
|
latest_valid_backup_id_ = 0;
|
|
if (options_.destroy_old_data) { // Destroy old data
|
|
assert(!read_only_);
|
|
ROCKS_LOG_INFO(
|
|
options_.info_log,
|
|
"Backup Engine started with destroy_old_data == true, deleting all "
|
|
"backups");
|
|
auto s = PurgeOldBackups(0);
|
|
if (s.ok()) {
|
|
s = GarbageCollect();
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
} else { // Load data from storage
|
|
// abs_path_to_size: maps absolute paths of files in backup directory to
|
|
// their corresponding sizes
|
|
std::unordered_map<std::string, uint64_t> abs_path_to_size;
|
|
// Insert files and their sizes in backup sub-directories (shared and
|
|
// shared_checksum) to abs_path_to_size
|
|
for (const auto& rel_dir :
|
|
{GetSharedFileRel(), GetSharedFileWithChecksumRel()}) {
|
|
const auto abs_dir = GetAbsolutePath(rel_dir);
|
|
// TODO: What do do on error?
|
|
InsertPathnameToSizeBytes(abs_dir, backup_env_, &abs_path_to_size)
|
|
.PermitUncheckedError();
|
|
}
|
|
// load the backups if any, until valid_backups_to_open of the latest
|
|
// non-corrupted backups have been successfully opened.
|
|
int valid_backups_to_open = options_.max_valid_backups_to_open;
|
|
for (auto backup_iter = backups_.rbegin();
|
|
backup_iter != backups_.rend();
|
|
++backup_iter) {
|
|
assert(latest_backup_id_ == 0 || latest_backup_id_ > backup_iter->first);
|
|
if (latest_backup_id_ == 0) {
|
|
latest_backup_id_ = backup_iter->first;
|
|
}
|
|
if (valid_backups_to_open == 0) {
|
|
break;
|
|
}
|
|
|
|
// Insert files and their sizes in backup sub-directories
|
|
// (private/backup_id) to abs_path_to_size
|
|
Status s = InsertPathnameToSizeBytes(
|
|
GetAbsolutePath(GetPrivateFileRel(backup_iter->first)), backup_env_,
|
|
&abs_path_to_size);
|
|
if (s.ok()) {
|
|
s = backup_iter->second->LoadFromFile(options_.backup_dir,
|
|
abs_path_to_size);
|
|
}
|
|
if (s.IsCorruption()) {
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup %u corrupted -- %s",
|
|
backup_iter->first, s.ToString().c_str());
|
|
corrupt_backups_.insert(
|
|
std::make_pair(backup_iter->first,
|
|
std::make_pair(s, std::move(backup_iter->second))));
|
|
} else if (!s.ok()) {
|
|
// Distinguish corruption errors from errors in the backup Env.
|
|
// Errors in the backup Env (i.e., this code path) will cause Open() to
|
|
// fail, whereas corruption errors would not cause Open() failures.
|
|
return s;
|
|
} else {
|
|
ROCKS_LOG_INFO(options_.info_log, "Loading backup %" PRIu32 " OK:\n%s",
|
|
backup_iter->first,
|
|
backup_iter->second->GetInfoString().c_str());
|
|
assert(latest_valid_backup_id_ == 0 ||
|
|
latest_valid_backup_id_ > backup_iter->first);
|
|
if (latest_valid_backup_id_ == 0) {
|
|
latest_valid_backup_id_ = backup_iter->first;
|
|
}
|
|
--valid_backups_to_open;
|
|
}
|
|
}
|
|
|
|
for (const auto& corrupt : corrupt_backups_) {
|
|
backups_.erase(backups_.find(corrupt.first));
|
|
}
|
|
// erase the backups before max_valid_backups_to_open
|
|
int num_unopened_backups;
|
|
if (options_.max_valid_backups_to_open == 0) {
|
|
num_unopened_backups = 0;
|
|
} else {
|
|
num_unopened_backups =
|
|
std::max(0, static_cast<int>(backups_.size()) -
|
|
options_.max_valid_backups_to_open);
|
|
}
|
|
for (int i = 0; i < num_unopened_backups; ++i) {
|
|
assert(backups_.begin()->second->Empty());
|
|
backups_.erase(backups_.begin());
|
|
}
|
|
}
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Latest backup is %u", latest_backup_id_);
|
|
ROCKS_LOG_INFO(options_.info_log, "Latest valid backup is %u",
|
|
latest_valid_backup_id_);
|
|
|
|
// set up threads perform copies from files_to_copy_or_create_ in the
|
|
// background
|
|
threads_cpu_priority_ = CpuPriority::kNormal;
|
|
threads_.reserve(options_.max_background_operations);
|
|
for (int t = 0; t < options_.max_background_operations; t++) {
|
|
threads_.emplace_back([this]() {
|
|
#if defined(_GNU_SOURCE) && defined(__GLIBC_PREREQ)
|
|
#if __GLIBC_PREREQ(2, 12)
|
|
pthread_setname_np(pthread_self(), "backup_engine");
|
|
#endif
|
|
#endif
|
|
CpuPriority current_priority = CpuPriority::kNormal;
|
|
CopyOrCreateWorkItem work_item;
|
|
while (files_to_copy_or_create_.read(work_item)) {
|
|
CpuPriority priority = threads_cpu_priority_;
|
|
if (current_priority != priority) {
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"BackupEngineImpl::Initialize:SetCpuPriority", &priority);
|
|
port::SetCpuPriority(0, priority);
|
|
current_priority = priority;
|
|
}
|
|
CopyOrCreateResult result;
|
|
result.status = CopyOrCreateFile(
|
|
work_item.src_path, work_item.dst_path, work_item.contents,
|
|
work_item.src_env, work_item.dst_env, work_item.src_env_options,
|
|
work_item.sync, work_item.rate_limiter, &result.size,
|
|
&result.checksum_hex, work_item.size_limit,
|
|
work_item.progress_callback);
|
|
result.db_id = work_item.db_id;
|
|
result.db_session_id = work_item.db_session_id;
|
|
if (result.status.ok() && work_item.verify_checksum_after_work) {
|
|
// unknown checksum function name implies no db table file checksum in
|
|
// db manifest; work_item.verify_checksum_after_work being true means
|
|
// backup engine has calculated its crc32c checksum for the table
|
|
// file; therefore, we are able to compare the checksums.
|
|
if (work_item.src_checksum_func_name ==
|
|
kUnknownFileChecksumFuncName ||
|
|
work_item.src_checksum_func_name == kDbFileChecksumFuncName) {
|
|
if (work_item.src_checksum_hex != result.checksum_hex) {
|
|
std::string checksum_info(
|
|
"Expected checksum is " + work_item.src_checksum_hex +
|
|
" while computed checksum is " + result.checksum_hex);
|
|
result.status =
|
|
Status::Corruption("Checksum mismatch after copying to " +
|
|
work_item.dst_path + ": " + checksum_info);
|
|
}
|
|
} else {
|
|
std::string checksum_function_info(
|
|
"Existing checksum function is " +
|
|
work_item.src_checksum_func_name +
|
|
" while provided checksum function is " +
|
|
kBackupFileChecksumFuncName);
|
|
ROCKS_LOG_INFO(
|
|
options_.info_log,
|
|
"Unable to verify checksum after copying to %s: %s\n",
|
|
work_item.dst_path.c_str(), checksum_function_info.c_str());
|
|
}
|
|
}
|
|
work_item.result.set_value(std::move(result));
|
|
}
|
|
});
|
|
}
|
|
ROCKS_LOG_INFO(options_.info_log, "Initialized BackupEngine");
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BackupEngineImpl::CreateNewBackupWithMetadata(
|
|
const CreateBackupOptions& options, DB* db,
|
|
const std::string& app_metadata) {
|
|
assert(initialized_);
|
|
assert(!read_only_);
|
|
if (app_metadata.size() > kMaxAppMetaSize) {
|
|
return Status::InvalidArgument("App metadata too large");
|
|
}
|
|
|
|
if (options.decrease_background_thread_cpu_priority) {
|
|
if (options.background_thread_cpu_priority < threads_cpu_priority_) {
|
|
threads_cpu_priority_.store(options.background_thread_cpu_priority);
|
|
}
|
|
}
|
|
|
|
BackupID new_backup_id = latest_backup_id_ + 1;
|
|
|
|
assert(backups_.find(new_backup_id) == backups_.end());
|
|
|
|
auto private_dir = GetAbsolutePath(GetPrivateFileRel(new_backup_id));
|
|
Status s = backup_env_->FileExists(private_dir);
|
|
if (s.ok()) {
|
|
// maybe last backup failed and left partial state behind, clean it up.
|
|
// need to do this before updating backups_ such that a private dir
|
|
// named after new_backup_id will be cleaned up.
|
|
// (If an incomplete new backup is followed by an incomplete delete
|
|
// of the latest full backup, then there could be more than one next
|
|
// id with a private dir, the last thing to be deleted in delete
|
|
// backup, but all will be cleaned up with a GarbageCollect.)
|
|
s = GarbageCollect();
|
|
} else if (s.IsNotFound()) {
|
|
// normal case, the new backup's private dir doesn't exist yet
|
|
s = Status::OK();
|
|
}
|
|
|
|
auto ret = backups_.insert(std::make_pair(
|
|
new_backup_id, std::unique_ptr<BackupMeta>(new BackupMeta(
|
|
GetBackupMetaFile(new_backup_id, false /* tmp */),
|
|
GetBackupMetaFile(new_backup_id, true /* tmp */),
|
|
&backuped_file_infos_, backup_env_))));
|
|
assert(ret.second == true);
|
|
auto& new_backup = ret.first->second;
|
|
// TODO: What should we do on error here?
|
|
new_backup->RecordTimestamp().PermitUncheckedError();
|
|
new_backup->SetAppMetadata(app_metadata);
|
|
|
|
auto start_backup = backup_env_->NowMicros();
|
|
|
|
ROCKS_LOG_INFO(options_.info_log,
|
|
"Started the backup process -- creating backup %u",
|
|
new_backup_id);
|
|
|
|
if (options_.share_table_files && !options_.share_files_with_checksum) {
|
|
ROCKS_LOG_WARN(options_.info_log,
|
|
"BackupableDBOptions::share_files_with_checksum=false is "
|
|
"DEPRECATED and could lead to data loss.");
|
|
}
|
|
|
|
if (s.ok()) {
|
|
s = backup_env_->CreateDir(private_dir);
|
|
}
|
|
|
|
RateLimiter* rate_limiter = options_.backup_rate_limiter.get();
|
|
if (rate_limiter) {
|
|
copy_file_buffer_size_ = static_cast<size_t>(rate_limiter->GetSingleBurstBytes());
|
|
}
|
|
|
|
// A set into which we will insert the dst_paths that are calculated for live
|
|
// files and live WAL files.
|
|
// This is used to check whether a live files shares a dst_path with another
|
|
// live file.
|
|
std::unordered_set<std::string> live_dst_paths;
|
|
|
|
std::vector<BackupAfterCopyOrCreateWorkItem> backup_items_to_finish;
|
|
// Add a CopyOrCreateWorkItem to the channel for each live file
|
|
Status disabled = db->DisableFileDeletions();
|
|
if (s.ok()) {
|
|
CheckpointImpl checkpoint(db);
|
|
uint64_t sequence_number = 0;
|
|
DBOptions db_options = db->GetDBOptions();
|
|
FileChecksumGenFactory* db_checksum_factory =
|
|
db_options.file_checksum_gen_factory.get();
|
|
const std::string kFileChecksumGenFactoryName =
|
|
"FileChecksumGenCrc32cFactory";
|
|
bool compare_checksum =
|
|
db_checksum_factory != nullptr &&
|
|
db_checksum_factory->Name() == kFileChecksumGenFactoryName
|
|
? true
|
|
: false;
|
|
EnvOptions src_raw_env_options(db_options);
|
|
s = checkpoint.CreateCustomCheckpoint(
|
|
db_options,
|
|
[&](const std::string& /*src_dirname*/, const std::string& /*fname*/,
|
|
FileType) {
|
|
// custom checkpoint will switch to calling copy_file_cb after it sees
|
|
// NotSupported returned from link_file_cb.
|
|
return Status::NotSupported();
|
|
} /* link_file_cb */,
|
|
[&](const std::string& src_dirname, const std::string& fname,
|
|
uint64_t size_limit_bytes, FileType type,
|
|
const std::string& checksum_func_name,
|
|
const std::string& checksum_val) {
|
|
if (type == kWalFile && !options_.backup_log_files) {
|
|
return Status::OK();
|
|
}
|
|
Log(options_.info_log, "add file for backup %s", fname.c_str());
|
|
uint64_t size_bytes = 0;
|
|
Status st;
|
|
if (type == kTableFile) {
|
|
st = db_env_->GetFileSize(src_dirname + fname, &size_bytes);
|
|
}
|
|
EnvOptions src_env_options;
|
|
switch (type) {
|
|
case kWalFile:
|
|
src_env_options =
|
|
db_env_->OptimizeForLogRead(src_raw_env_options);
|
|
break;
|
|
case kTableFile:
|
|
src_env_options = db_env_->OptimizeForCompactionTableRead(
|
|
src_raw_env_options, ImmutableDBOptions(db_options));
|
|
break;
|
|
case kDescriptorFile:
|
|
src_env_options =
|
|
db_env_->OptimizeForManifestRead(src_raw_env_options);
|
|
break;
|
|
default:
|
|
// Other backed up files (like options file) are not read by live
|
|
// DB, so don't need to worry about avoiding mixing buffered and
|
|
// direct I/O. Just use plain defaults.
|
|
src_env_options = src_raw_env_options;
|
|
break;
|
|
}
|
|
if (st.ok()) {
|
|
st = AddBackupFileWorkItem(
|
|
live_dst_paths, backup_items_to_finish, new_backup_id,
|
|
options_.share_table_files && type == kTableFile, src_dirname,
|
|
fname, src_env_options, rate_limiter, size_bytes,
|
|
size_limit_bytes,
|
|
options_.share_files_with_checksum && type == kTableFile,
|
|
options.progress_callback, "" /* contents */,
|
|
checksum_func_name, checksum_val);
|
|
}
|
|
return st;
|
|
} /* copy_file_cb */,
|
|
[&](const std::string& fname, const std::string& contents, FileType) {
|
|
Log(options_.info_log, "add file for backup %s", fname.c_str());
|
|
return AddBackupFileWorkItem(
|
|
live_dst_paths, backup_items_to_finish, new_backup_id,
|
|
false /* shared */, "" /* src_dir */, fname,
|
|
EnvOptions() /* src_env_options */, rate_limiter, contents.size(),
|
|
0 /* size_limit */, false /* shared_checksum */,
|
|
options.progress_callback, contents);
|
|
} /* create_file_cb */,
|
|
&sequence_number, options.flush_before_backup ? 0 : port::kMaxUint64,
|
|
compare_checksum);
|
|
if (s.ok()) {
|
|
new_backup->SetSequenceNumber(sequence_number);
|
|
}
|
|
}
|
|
ROCKS_LOG_INFO(options_.info_log, "add files for backup done, wait finish.");
|
|
Status item_status;
|
|
for (auto& item : backup_items_to_finish) {
|
|
item.result.wait();
|
|
auto result = item.result.get();
|
|
item_status = result.status;
|
|
if (item_status.ok() && item.shared && item.needed_to_copy) {
|
|
item_status =
|
|
item.backup_env->RenameFile(item.dst_path_tmp, item.dst_path);
|
|
}
|
|
if (item_status.ok()) {
|
|
item_status = new_backup.get()->AddFile(std::make_shared<FileInfo>(
|
|
item.dst_relative, result.size, result.checksum_hex, result.db_id,
|
|
result.db_session_id));
|
|
}
|
|
if (!item_status.ok()) {
|
|
s = item_status;
|
|
}
|
|
}
|
|
|
|
// we copied all the files, enable file deletions
|
|
if (disabled.ok()) { // If we successfully disabled file deletions
|
|
db->EnableFileDeletions(false).PermitUncheckedError();
|
|
}
|
|
auto backup_time = backup_env_->NowMicros() - start_backup;
|
|
|
|
if (s.ok()) {
|
|
// persist the backup metadata on the disk
|
|
s = new_backup->StoreToFile(options_.sync);
|
|
}
|
|
if (s.ok() && options_.sync) {
|
|
std::unique_ptr<Directory> backup_private_directory;
|
|
backup_env_->NewDirectory(
|
|
GetAbsolutePath(GetPrivateFileRel(new_backup_id, false)),
|
|
&backup_private_directory);
|
|
if (backup_private_directory != nullptr) {
|
|
s = backup_private_directory->Fsync();
|
|
}
|
|
if (s.ok() && private_directory_ != nullptr) {
|
|
s = private_directory_->Fsync();
|
|
}
|
|
if (s.ok() && meta_directory_ != nullptr) {
|
|
s = meta_directory_->Fsync();
|
|
}
|
|
if (s.ok() && shared_directory_ != nullptr) {
|
|
s = shared_directory_->Fsync();
|
|
}
|
|
if (s.ok() && backup_directory_ != nullptr) {
|
|
s = backup_directory_->Fsync();
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
backup_statistics_.IncrementNumberSuccessBackup();
|
|
}
|
|
if (!s.ok()) {
|
|
backup_statistics_.IncrementNumberFailBackup();
|
|
// clean all the files we might have created
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup failed -- %s",
|
|
s.ToString().c_str());
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup Statistics %s\n",
|
|
backup_statistics_.ToString().c_str());
|
|
// delete files that we might have already written
|
|
might_need_garbage_collect_ = true;
|
|
DeleteBackup(new_backup_id).PermitUncheckedError();
|
|
return s;
|
|
}
|
|
|
|
// here we know that we succeeded and installed the new backup
|
|
// in the LATEST_BACKUP file
|
|
latest_backup_id_ = new_backup_id;
|
|
latest_valid_backup_id_ = new_backup_id;
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup DONE. All is good");
|
|
|
|
// backup_speed is in byte/second
|
|
double backup_speed = new_backup->GetSize() / (1.048576 * backup_time);
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup number of files: %u",
|
|
new_backup->GetNumberFiles());
|
|
char human_size[16];
|
|
AppendHumanBytes(new_backup->GetSize(), human_size, sizeof(human_size));
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup size: %s", human_size);
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup time: %" PRIu64 " microseconds",
|
|
backup_time);
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup speed: %.3f MB/s", backup_speed);
|
|
ROCKS_LOG_INFO(options_.info_log, "Backup Statistics %s",
|
|
backup_statistics_.ToString().c_str());
|
|
return s;
|
|
}
|
|
|
|
Status BackupEngineImpl::PurgeOldBackups(uint32_t num_backups_to_keep) {
|
|
assert(initialized_);
|
|
assert(!read_only_);
|
|
|
|
// Best effort deletion even with errors
|
|
Status overall_status = Status::OK();
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Purging old backups, keeping %u",
|
|
num_backups_to_keep);
|
|
std::vector<BackupID> to_delete;
|
|
auto itr = backups_.begin();
|
|
while ((backups_.size() - to_delete.size()) > num_backups_to_keep) {
|
|
to_delete.push_back(itr->first);
|
|
itr++;
|
|
}
|
|
for (auto backup_id : to_delete) {
|
|
auto s = DeleteBackupInternal(backup_id);
|
|
if (!s.ok()) {
|
|
overall_status = s;
|
|
}
|
|
}
|
|
// Clean up after any incomplete backup deletion, potentially from
|
|
// earlier session.
|
|
if (might_need_garbage_collect_) {
|
|
auto s = GarbageCollect();
|
|
if (!s.ok() && overall_status.ok()) {
|
|
overall_status = s;
|
|
}
|
|
}
|
|
return overall_status;
|
|
}
|
|
|
|
Status BackupEngineImpl::DeleteBackup(BackupID backup_id) {
|
|
auto s1 = DeleteBackupInternal(backup_id);
|
|
auto s2 = Status::OK();
|
|
|
|
// Clean up after any incomplete backup deletion, potentially from
|
|
// earlier session.
|
|
if (might_need_garbage_collect_) {
|
|
s2 = GarbageCollect();
|
|
}
|
|
|
|
if (!s1.ok()) {
|
|
s2.PermitUncheckedError(); // What to do?
|
|
return s1;
|
|
} else {
|
|
return s2;
|
|
}
|
|
}
|
|
|
|
// Does not auto-GarbageCollect
|
|
Status BackupEngineImpl::DeleteBackupInternal(BackupID backup_id) {
|
|
assert(initialized_);
|
|
assert(!read_only_);
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting backup %u", backup_id);
|
|
auto backup = backups_.find(backup_id);
|
|
if (backup != backups_.end()) {
|
|
auto s = backup->second->Delete();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
backups_.erase(backup);
|
|
} else {
|
|
auto corrupt = corrupt_backups_.find(backup_id);
|
|
if (corrupt == corrupt_backups_.end()) {
|
|
return Status::NotFound("Backup not found");
|
|
}
|
|
auto s = corrupt->second.second->Delete();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
corrupt->second.first.PermitUncheckedError();
|
|
corrupt_backups_.erase(corrupt);
|
|
}
|
|
|
|
// After removing meta file, best effort deletion even with errors.
|
|
// (Don't delete other files if we can't delete the meta file right
|
|
// now.)
|
|
std::vector<std::string> to_delete;
|
|
for (auto& itr : backuped_file_infos_) {
|
|
if (itr.second->refs == 0) {
|
|
Status s = backup_env_->DeleteFile(GetAbsolutePath(itr.first));
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting %s -- %s", itr.first.c_str(),
|
|
s.ToString().c_str());
|
|
to_delete.push_back(itr.first);
|
|
if (!s.ok()) {
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
}
|
|
for (auto& td : to_delete) {
|
|
backuped_file_infos_.erase(td);
|
|
}
|
|
|
|
// take care of private dirs -- GarbageCollect() will take care of them
|
|
// if they are not empty
|
|
std::string private_dir = GetPrivateFileRel(backup_id);
|
|
Status s = backup_env_->DeleteDir(GetAbsolutePath(private_dir));
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting private dir %s -- %s",
|
|
private_dir.c_str(), s.ToString().c_str());
|
|
if (!s.ok()) {
|
|
// Full gc or trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
void BackupEngineImpl::GetBackupInfo(std::vector<BackupInfo>* backup_info,
|
|
bool include_file_details) const {
|
|
assert(initialized_);
|
|
backup_info->reserve(backups_.size());
|
|
for (auto& backup : backups_) {
|
|
const BackupMeta& meta = *backup.second;
|
|
if (!meta.Empty()) {
|
|
backup_info->push_back(BackupInfo(backup.first, meta.GetTimestamp(),
|
|
meta.GetSize(), meta.GetNumberFiles(),
|
|
meta.GetAppMetadata()));
|
|
if (include_file_details) {
|
|
auto& file_details = backup_info->back().file_details;
|
|
file_details.reserve(meta.GetFiles().size());
|
|
for (auto& file_ptr : meta.GetFiles()) {
|
|
BackupFileInfo& info = *file_details.emplace(file_details.end());
|
|
info.relative_filename = file_ptr->filename;
|
|
info.size = file_ptr->size;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void BackupEngineImpl::GetCorruptedBackups(
|
|
std::vector<BackupID>* corrupt_backup_ids) const {
|
|
assert(initialized_);
|
|
corrupt_backup_ids->reserve(corrupt_backups_.size());
|
|
for (auto& backup : corrupt_backups_) {
|
|
corrupt_backup_ids->push_back(backup.first);
|
|
}
|
|
}
|
|
|
|
Status BackupEngineImpl::RestoreDBFromBackup(const RestoreOptions& options,
|
|
BackupID backup_id,
|
|
const std::string& db_dir,
|
|
const std::string& wal_dir) {
|
|
assert(initialized_);
|
|
auto corrupt_itr = corrupt_backups_.find(backup_id);
|
|
if (corrupt_itr != corrupt_backups_.end()) {
|
|
return corrupt_itr->second.first;
|
|
}
|
|
auto backup_itr = backups_.find(backup_id);
|
|
if (backup_itr == backups_.end()) {
|
|
return Status::NotFound("Backup not found");
|
|
}
|
|
auto& backup = backup_itr->second;
|
|
if (backup->Empty()) {
|
|
return Status::NotFound("Backup not found");
|
|
}
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Restoring backup id %u\n", backup_id);
|
|
ROCKS_LOG_INFO(options_.info_log, "keep_log_files: %d\n",
|
|
static_cast<int>(options.keep_log_files));
|
|
|
|
// just in case. Ignore errors
|
|
db_env_->CreateDirIfMissing(db_dir).PermitUncheckedError();
|
|
db_env_->CreateDirIfMissing(wal_dir).PermitUncheckedError();
|
|
|
|
if (options.keep_log_files) {
|
|
// delete files in db_dir, but keep all the log files
|
|
DeleteChildren(db_dir, 1 << kWalFile);
|
|
// move all the files from archive dir to wal_dir
|
|
std::string archive_dir = ArchivalDirectory(wal_dir);
|
|
std::vector<std::string> archive_files;
|
|
db_env_->GetChildren(archive_dir, &archive_files)
|
|
.PermitUncheckedError(); // ignore errors
|
|
for (const auto& f : archive_files) {
|
|
uint64_t number;
|
|
FileType type;
|
|
bool ok = ParseFileName(f, &number, &type);
|
|
if (ok && type == kWalFile) {
|
|
ROCKS_LOG_INFO(options_.info_log,
|
|
"Moving log file from archive/ to wal_dir: %s",
|
|
f.c_str());
|
|
Status s =
|
|
db_env_->RenameFile(archive_dir + "/" + f, wal_dir + "/" + f);
|
|
if (!s.ok()) {
|
|
// if we can't move log file from archive_dir to wal_dir,
|
|
// we should fail, since it might mean data loss
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
DeleteChildren(wal_dir);
|
|
DeleteChildren(ArchivalDirectory(wal_dir));
|
|
DeleteChildren(db_dir);
|
|
}
|
|
|
|
RateLimiter* rate_limiter = options_.restore_rate_limiter.get();
|
|
if (rate_limiter) {
|
|
copy_file_buffer_size_ =
|
|
static_cast<size_t>(rate_limiter->GetSingleBurstBytes());
|
|
}
|
|
Status s;
|
|
std::vector<RestoreAfterCopyOrCreateWorkItem> restore_items_to_finish;
|
|
for (const auto& file_info : backup->GetFiles()) {
|
|
const std::string& file = file_info->filename;
|
|
std::string dst;
|
|
// 1. extract the filename
|
|
size_t slash = file.find_last_of('/');
|
|
// file will either be shared/<file>, shared_checksum/<file_crc32c_size>,
|
|
// shared_checksum/<file_session>, shared_checksum/<file_crc32c_session>,
|
|
// or private/<number>/<file>
|
|
assert(slash != std::string::npos);
|
|
dst = file.substr(slash + 1);
|
|
|
|
// if the file was in shared_checksum, extract the real file name
|
|
// in this case the file is <number>_<checksum>_<size>.<type>,
|
|
// <number>_<session>.<type>, or <number>_<checksum>_<session>.<type>
|
|
if (file.substr(0, slash) == GetSharedChecksumDirRel()) {
|
|
dst = GetFileFromChecksumFile(dst);
|
|
}
|
|
|
|
// 2. find the filetype
|
|
uint64_t number;
|
|
FileType type;
|
|
bool ok = ParseFileName(dst, &number, &type);
|
|
if (!ok) {
|
|
return Status::Corruption("Backup corrupted: Fail to parse filename " +
|
|
dst);
|
|
}
|
|
// 3. Construct the final path
|
|
// kWalFile lives in wal_dir and all the rest live in db_dir
|
|
dst = ((type == kWalFile) ? wal_dir : db_dir) + "/" + dst;
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Restoring %s to %s\n", file.c_str(),
|
|
dst.c_str());
|
|
CopyOrCreateWorkItem copy_or_create_work_item(
|
|
GetAbsolutePath(file), dst, "" /* contents */, backup_env_, db_env_,
|
|
EnvOptions() /* src_env_options */, false, rate_limiter,
|
|
0 /* size_limit */);
|
|
RestoreAfterCopyOrCreateWorkItem after_copy_or_create_work_item(
|
|
copy_or_create_work_item.result.get_future(), file_info->checksum_hex);
|
|
files_to_copy_or_create_.write(std::move(copy_or_create_work_item));
|
|
restore_items_to_finish.push_back(
|
|
std::move(after_copy_or_create_work_item));
|
|
}
|
|
Status item_status;
|
|
for (auto& item : restore_items_to_finish) {
|
|
item.result.wait();
|
|
auto result = item.result.get();
|
|
item_status = result.status;
|
|
// Note: It is possible that both of the following bad-status cases occur
|
|
// during copying. But, we only return one status.
|
|
if (!item_status.ok()) {
|
|
s = item_status;
|
|
break;
|
|
} else if (item.checksum_hex != result.checksum_hex) {
|
|
s = Status::Corruption("Checksum check failed");
|
|
break;
|
|
}
|
|
}
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Restoring done -- %s\n",
|
|
s.ToString().c_str());
|
|
return s;
|
|
}
|
|
|
|
Status BackupEngineImpl::VerifyBackup(BackupID backup_id,
|
|
bool verify_with_checksum) {
|
|
// Check if backup_id is corrupted, or valid and registered
|
|
assert(initialized_);
|
|
auto corrupt_itr = corrupt_backups_.find(backup_id);
|
|
if (corrupt_itr != corrupt_backups_.end()) {
|
|
return corrupt_itr->second.first;
|
|
}
|
|
|
|
auto backup_itr = backups_.find(backup_id);
|
|
if (backup_itr == backups_.end()) {
|
|
return Status::NotFound();
|
|
}
|
|
|
|
auto& backup = backup_itr->second;
|
|
if (backup->Empty()) {
|
|
return Status::NotFound();
|
|
}
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Verifying backup id %u\n", backup_id);
|
|
|
|
// Find all existing backup files belong to backup_id
|
|
std::unordered_map<std::string, uint64_t> curr_abs_path_to_size;
|
|
for (const auto& rel_dir : {GetPrivateFileRel(backup_id), GetSharedFileRel(),
|
|
GetSharedFileWithChecksumRel()}) {
|
|
const auto abs_dir = GetAbsolutePath(rel_dir);
|
|
// TODO: What to do on error?
|
|
InsertPathnameToSizeBytes(abs_dir, backup_env_, &curr_abs_path_to_size)
|
|
.PermitUncheckedError();
|
|
}
|
|
|
|
// For all files registered in backup
|
|
for (const auto& file_info : backup->GetFiles()) {
|
|
const auto abs_path = GetAbsolutePath(file_info->filename);
|
|
// check existence of the file
|
|
if (curr_abs_path_to_size.find(abs_path) == curr_abs_path_to_size.end()) {
|
|
return Status::NotFound("File missing: " + abs_path);
|
|
}
|
|
// verify file size
|
|
if (file_info->size != curr_abs_path_to_size[abs_path]) {
|
|
std::string size_info("Expected file size is " +
|
|
ToString(file_info->size) +
|
|
" while found file size is " +
|
|
ToString(curr_abs_path_to_size[abs_path]));
|
|
return Status::Corruption("File corrupted: File size mismatch for " +
|
|
abs_path + ": " + size_info);
|
|
}
|
|
if (verify_with_checksum) {
|
|
// verify file checksum
|
|
std::string checksum_hex;
|
|
ROCKS_LOG_INFO(options_.info_log, "Verifying %s checksum...\n",
|
|
abs_path.c_str());
|
|
Status s = ReadFileAndComputeChecksum(abs_path, backup_env_, EnvOptions(),
|
|
0 /* size_limit */, &checksum_hex);
|
|
if (!s.ok()) {
|
|
return s;
|
|
} else if (file_info->checksum_hex != checksum_hex) {
|
|
std::string checksum_info(
|
|
"Expected checksum is " + file_info->checksum_hex +
|
|
" while computed checksum is " + checksum_hex);
|
|
return Status::Corruption("File corrupted: Checksum mismatch for " +
|
|
abs_path + ": " + checksum_info);
|
|
}
|
|
}
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BackupEngineImpl::CopyOrCreateFile(
|
|
const std::string& src, const std::string& dst, const std::string& contents,
|
|
Env* src_env, Env* dst_env, const EnvOptions& src_env_options, bool sync,
|
|
RateLimiter* rate_limiter, uint64_t* size, std::string* checksum_hex,
|
|
uint64_t size_limit, std::function<void()> progress_callback) {
|
|
assert(src.empty() != contents.empty());
|
|
Status s;
|
|
std::unique_ptr<FSWritableFile> dst_file;
|
|
std::unique_ptr<FSSequentialFile> src_file;
|
|
FileOptions dst_file_options;
|
|
dst_file_options.use_mmap_writes = false;
|
|
// TODO:(gzh) maybe use direct reads/writes here if possible
|
|
if (size != nullptr) {
|
|
*size = 0;
|
|
}
|
|
uint32_t checksum_value = 0;
|
|
|
|
// Check if size limit is set. if not, set it to very big number
|
|
if (size_limit == 0) {
|
|
size_limit = std::numeric_limits<uint64_t>::max();
|
|
}
|
|
|
|
s = dst_env->GetFileSystem()->NewWritableFile(dst, dst_file_options,
|
|
&dst_file, nullptr);
|
|
if (s.ok() && !src.empty()) {
|
|
s = src_env->GetFileSystem()->NewSequentialFile(
|
|
src, FileOptions(src_env_options), &src_file, nullptr);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
std::unique_ptr<WritableFileWriter> dest_writer(
|
|
new WritableFileWriter(std::move(dst_file), dst, dst_file_options));
|
|
std::unique_ptr<SequentialFileReader> src_reader;
|
|
std::unique_ptr<char[]> buf;
|
|
if (!src.empty()) {
|
|
src_reader.reset(new SequentialFileReader(std::move(src_file), src));
|
|
buf.reset(new char[copy_file_buffer_size_]);
|
|
}
|
|
|
|
Slice data;
|
|
uint64_t processed_buffer_size = 0;
|
|
do {
|
|
if (stop_backup_.load(std::memory_order_acquire)) {
|
|
return Status::Incomplete("Backup stopped");
|
|
}
|
|
if (!src.empty()) {
|
|
size_t buffer_to_read = (copy_file_buffer_size_ < size_limit)
|
|
? copy_file_buffer_size_
|
|
: static_cast<size_t>(size_limit);
|
|
s = src_reader->Read(buffer_to_read, &data, buf.get());
|
|
processed_buffer_size += buffer_to_read;
|
|
} else {
|
|
data = contents;
|
|
}
|
|
size_limit -= data.size();
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"BackupEngineImpl::CopyOrCreateFile:CorruptionDuringBackup",
|
|
(src.length() > 4 && src.rfind(".sst") == src.length() - 4) ? &data
|
|
: nullptr);
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (size != nullptr) {
|
|
*size += data.size();
|
|
}
|
|
if (checksum_hex != nullptr) {
|
|
checksum_value = crc32c::Extend(checksum_value, data.data(), data.size());
|
|
}
|
|
s = dest_writer->Append(data);
|
|
if (rate_limiter != nullptr) {
|
|
rate_limiter->Request(data.size(), Env::IO_LOW, nullptr /* stats */,
|
|
RateLimiter::OpType::kWrite);
|
|
}
|
|
if (processed_buffer_size > options_.callback_trigger_interval_size) {
|
|
processed_buffer_size -= options_.callback_trigger_interval_size;
|
|
std::lock_guard<std::mutex> lock(byte_report_mutex_);
|
|
progress_callback();
|
|
}
|
|
} while (s.ok() && contents.empty() && data.size() > 0 && size_limit > 0);
|
|
|
|
// Convert uint32_t checksum to hex checksum
|
|
if (checksum_hex != nullptr) {
|
|
checksum_hex->assign(ChecksumInt32ToHex(checksum_value));
|
|
}
|
|
|
|
if (s.ok() && sync) {
|
|
s = dest_writer->Sync(false);
|
|
}
|
|
if (s.ok()) {
|
|
s = dest_writer->Close();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// fname will always start with "/"
|
|
Status BackupEngineImpl::AddBackupFileWorkItem(
|
|
std::unordered_set<std::string>& live_dst_paths,
|
|
std::vector<BackupAfterCopyOrCreateWorkItem>& backup_items_to_finish,
|
|
BackupID backup_id, bool shared, const std::string& src_dir,
|
|
const std::string& fname, const EnvOptions& src_env_options,
|
|
RateLimiter* rate_limiter, uint64_t size_bytes, uint64_t size_limit,
|
|
bool shared_checksum, std::function<void()> progress_callback,
|
|
const std::string& contents, const std::string& src_checksum_func_name,
|
|
const std::string& src_checksum_str) {
|
|
assert(!fname.empty() && fname[0] == '/');
|
|
assert(contents.empty() != src_dir.empty());
|
|
|
|
std::string dst_relative = fname.substr(1);
|
|
std::string dst_relative_tmp;
|
|
std::string checksum_hex;
|
|
std::string db_id;
|
|
std::string db_session_id;
|
|
// whether the checksum for a table file is available
|
|
bool has_checksum = false;
|
|
|
|
// Whenever a default checksum function name is passed in, we will compares
|
|
// the corresponding checksum values after copying. Note that only table files
|
|
// may have a known checksum function name passed in.
|
|
//
|
|
// If no default checksum function name is passed in and db session id is not
|
|
// available, we will calculate the checksum *before* copying in two cases
|
|
// (we always calcuate checksums when copying or creating for any file types):
|
|
// a) share_files_with_checksum is true and file type is table;
|
|
// b) share_table_files is true and the file exists already.
|
|
//
|
|
// Step 0: Check if default checksum function name is passed in
|
|
if (kDbFileChecksumFuncName == src_checksum_func_name) {
|
|
if (src_checksum_str == kUnknownFileChecksum) {
|
|
return Status::Aborted("Unknown checksum value for " + fname);
|
|
}
|
|
checksum_hex = ChecksumStrToHex(src_checksum_str);
|
|
has_checksum = true;
|
|
}
|
|
|
|
// Step 1: Prepare the relative path to destination
|
|
if (shared && shared_checksum) {
|
|
if (GetNamingNoFlags() != BackupableDBOptions::kLegacyCrc32cAndFileSize) {
|
|
// Prepare db_session_id to add to the file name
|
|
// Ignore the returned status
|
|
// In the failed cases, db_id and db_session_id will be empty
|
|
GetFileDbIdentities(db_env_, src_env_options, src_dir + fname, &db_id,
|
|
&db_session_id)
|
|
.PermitUncheckedError();
|
|
}
|
|
// Calculate checksum if checksum and db session id are not available.
|
|
// If db session id is available, we will not calculate the checksum
|
|
// since the session id should suffice to avoid file name collision in
|
|
// the shared_checksum directory.
|
|
if (!has_checksum && db_session_id.empty()) {
|
|
Status s = ReadFileAndComputeChecksum(
|
|
src_dir + fname, db_env_, src_env_options, size_limit, &checksum_hex);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
has_checksum = true;
|
|
}
|
|
if (size_bytes == port::kMaxUint64) {
|
|
return Status::NotFound("File missing: " + src_dir + fname);
|
|
}
|
|
// dst_relative depends on the following conditions:
|
|
// 1) the naming scheme is kUseDbSessionId,
|
|
// 2) db_session_id is not empty,
|
|
// 3) checksum is available in the DB manifest.
|
|
// If 1,2,3) are satisfied, then dst_relative will be of the form:
|
|
// shared_checksum/<file_number>_<checksum>_<db_session_id>.sst
|
|
// If 1,2) are satisfied, then dst_relative will be of the form:
|
|
// shared_checksum/<file_number>_<db_session_id>.sst
|
|
// Otherwise, dst_relative is of the form
|
|
// shared_checksum/<file_number>_<checksum>_<size>.sst
|
|
dst_relative = GetSharedFileWithChecksum(
|
|
dst_relative, has_checksum, checksum_hex, size_bytes, db_session_id);
|
|
dst_relative_tmp = GetSharedFileWithChecksumRel(dst_relative, true);
|
|
dst_relative = GetSharedFileWithChecksumRel(dst_relative, false);
|
|
} else if (shared) {
|
|
dst_relative_tmp = GetSharedFileRel(dst_relative, true);
|
|
dst_relative = GetSharedFileRel(dst_relative, false);
|
|
} else {
|
|
dst_relative = GetPrivateFileRel(backup_id, false, dst_relative);
|
|
}
|
|
|
|
// We copy into `temp_dest_path` and, once finished, rename it to
|
|
// `final_dest_path`. This allows files to atomically appear at
|
|
// `final_dest_path`. We can copy directly to the final path when atomicity
|
|
// is unnecessary, like for files in private backup directories.
|
|
const std::string* copy_dest_path;
|
|
std::string temp_dest_path;
|
|
std::string final_dest_path = GetAbsolutePath(dst_relative);
|
|
if (!dst_relative_tmp.empty()) {
|
|
temp_dest_path = GetAbsolutePath(dst_relative_tmp);
|
|
copy_dest_path = &temp_dest_path;
|
|
} else {
|
|
copy_dest_path = &final_dest_path;
|
|
}
|
|
|
|
// Step 2: Determine whether to copy or not
|
|
// if it's shared, we also need to check if it exists -- if it does, no need
|
|
// to copy it again.
|
|
bool need_to_copy = true;
|
|
// true if final_dest_path is the same path as another live file
|
|
const bool same_path =
|
|
live_dst_paths.find(final_dest_path) != live_dst_paths.end();
|
|
|
|
bool file_exists = false;
|
|
if (shared && !same_path) {
|
|
// Should be in shared directory but not a live path, check existence in
|
|
// shared directory
|
|
Status exist = backup_env_->FileExists(final_dest_path);
|
|
if (exist.ok()) {
|
|
file_exists = true;
|
|
} else if (exist.IsNotFound()) {
|
|
file_exists = false;
|
|
} else {
|
|
return exist;
|
|
}
|
|
}
|
|
|
|
if (!contents.empty()) {
|
|
need_to_copy = false;
|
|
} else if (shared && (same_path || file_exists)) {
|
|
need_to_copy = false;
|
|
auto find_result = backuped_file_infos_.find(dst_relative);
|
|
if (find_result == backuped_file_infos_.end() && !same_path) {
|
|
// file exists but not referenced
|
|
ROCKS_LOG_INFO(
|
|
options_.info_log,
|
|
"%s already present, but not referenced by any backup. We will "
|
|
"overwrite the file.",
|
|
fname.c_str());
|
|
need_to_copy = true;
|
|
//**TODO: What to do on error?
|
|
backup_env_->DeleteFile(final_dest_path).PermitUncheckedError();
|
|
} else {
|
|
// file exists and referenced
|
|
if (!has_checksum) {
|
|
if (!same_path) {
|
|
assert(find_result != backuped_file_infos_.end());
|
|
// Note: to save I/O on incremental backups, we copy prior known
|
|
// checksum of the file instead of reading entire file contents
|
|
// to recompute it.
|
|
checksum_hex = find_result->second->checksum_hex;
|
|
has_checksum = true;
|
|
// Regarding corruption detection, consider:
|
|
// (a) the DB file is corrupt (since previous backup) and the backup
|
|
// file is OK: we failed to detect, but the backup is safe. DB can
|
|
// be repaired/restored once its corruption is detected.
|
|
// (b) the backup file is corrupt (since previous backup) and the
|
|
// db file is OK: we failed to detect, but the backup is corrupt.
|
|
// CreateNewBackup should support fast incremental backups and
|
|
// there's no way to support that without reading all the files.
|
|
// We might add an option for extra checks on incremental backup,
|
|
// but until then, use VerifyBackups to check existing backup data.
|
|
// (c) file name collision with legitimately different content.
|
|
// This is almost inconceivable with a well-generated DB session
|
|
// ID, but even in that case, we double check the file sizes in
|
|
// BackupMeta::AddFile.
|
|
} else {
|
|
// same_path should not happen for a standard DB, so OK to
|
|
// read file contents to check for checksum mismatch between
|
|
// two files from same DB getting same name.
|
|
Status s = ReadFileAndComputeChecksum(src_dir + fname, db_env_,
|
|
src_env_options, size_limit,
|
|
&checksum_hex);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
if (!db_session_id.empty()) {
|
|
ROCKS_LOG_INFO(options_.info_log,
|
|
"%s already present, with checksum %s, size %" PRIu64
|
|
" and DB session identity %s",
|
|
fname.c_str(), checksum_hex.c_str(), size_bytes,
|
|
db_session_id.c_str());
|
|
} else {
|
|
ROCKS_LOG_INFO(options_.info_log,
|
|
"%s already present, with checksum %s and size %" PRIu64,
|
|
fname.c_str(), checksum_hex.c_str(), size_bytes);
|
|
}
|
|
}
|
|
}
|
|
live_dst_paths.insert(final_dest_path);
|
|
|
|
// Step 3: Add work item
|
|
if (!contents.empty() || need_to_copy) {
|
|
ROCKS_LOG_INFO(options_.info_log, "Copying %s to %s", fname.c_str(),
|
|
copy_dest_path->c_str());
|
|
CopyOrCreateWorkItem copy_or_create_work_item(
|
|
src_dir.empty() ? "" : src_dir + fname, *copy_dest_path, contents,
|
|
db_env_, backup_env_, src_env_options, options_.sync, rate_limiter,
|
|
size_limit, progress_callback, has_checksum, src_checksum_func_name,
|
|
checksum_hex, db_id, db_session_id);
|
|
BackupAfterCopyOrCreateWorkItem after_copy_or_create_work_item(
|
|
copy_or_create_work_item.result.get_future(), shared, need_to_copy,
|
|
backup_env_, temp_dest_path, final_dest_path, dst_relative);
|
|
files_to_copy_or_create_.write(std::move(copy_or_create_work_item));
|
|
backup_items_to_finish.push_back(std::move(after_copy_or_create_work_item));
|
|
} else {
|
|
std::promise<CopyOrCreateResult> promise_result;
|
|
BackupAfterCopyOrCreateWorkItem after_copy_or_create_work_item(
|
|
promise_result.get_future(), shared, need_to_copy, backup_env_,
|
|
temp_dest_path, final_dest_path, dst_relative);
|
|
backup_items_to_finish.push_back(std::move(after_copy_or_create_work_item));
|
|
CopyOrCreateResult result;
|
|
result.status = Status::OK();
|
|
result.size = size_bytes;
|
|
result.checksum_hex = std::move(checksum_hex);
|
|
result.db_id = std::move(db_id);
|
|
result.db_session_id = std::move(db_session_id);
|
|
promise_result.set_value(std::move(result));
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BackupEngineImpl::ReadFileAndComputeChecksum(
|
|
const std::string& src, Env* src_env, const EnvOptions& src_env_options,
|
|
uint64_t size_limit, std::string* checksum_hex) {
|
|
if (checksum_hex == nullptr) {
|
|
return Status::Aborted("Checksum pointer is null");
|
|
}
|
|
uint32_t checksum_value = 0;
|
|
if (size_limit == 0) {
|
|
size_limit = std::numeric_limits<uint64_t>::max();
|
|
}
|
|
|
|
std::unique_ptr<SequentialFileReader> src_reader;
|
|
Status s = SequentialFileReader::Create(src_env->GetFileSystem(), src,
|
|
FileOptions(src_env_options),
|
|
&src_reader, nullptr);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
std::unique_ptr<char[]> buf(new char[copy_file_buffer_size_]);
|
|
Slice data;
|
|
|
|
do {
|
|
if (stop_backup_.load(std::memory_order_acquire)) {
|
|
return Status::Incomplete("Backup stopped");
|
|
}
|
|
size_t buffer_to_read = (copy_file_buffer_size_ < size_limit) ?
|
|
copy_file_buffer_size_ : static_cast<size_t>(size_limit);
|
|
s = src_reader->Read(buffer_to_read, &data, buf.get());
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
size_limit -= data.size();
|
|
checksum_value = crc32c::Extend(checksum_value, data.data(), data.size());
|
|
} while (data.size() > 0 && size_limit > 0);
|
|
|
|
checksum_hex->assign(ChecksumInt32ToHex(checksum_value));
|
|
|
|
return s;
|
|
}
|
|
|
|
Status BackupEngineImpl::GetFileDbIdentities(Env* src_env,
|
|
const EnvOptions& src_env_options,
|
|
const std::string& file_path,
|
|
std::string* db_id,
|
|
std::string* db_session_id) {
|
|
assert(db_id != nullptr || db_session_id != nullptr);
|
|
|
|
Options options;
|
|
options.env = src_env;
|
|
SstFileDumper sst_reader(options, file_path,
|
|
2 * 1024 * 1024
|
|
/* readahead_size */,
|
|
false /* verify_checksum */, false /* output_hex */,
|
|
false /* decode_blob_index */, src_env_options,
|
|
true /* silent */);
|
|
|
|
const TableProperties* table_properties = nullptr;
|
|
std::shared_ptr<const TableProperties> tp;
|
|
Status s = sst_reader.getStatus();
|
|
|
|
if (s.ok()) {
|
|
// Try to get table properties from the table reader of sst_reader
|
|
if (!sst_reader.ReadTableProperties(&tp).ok()) {
|
|
// Try to use table properites from the initialization of sst_reader
|
|
table_properties = sst_reader.GetInitTableProperties();
|
|
} else {
|
|
table_properties = tp.get();
|
|
}
|
|
} else {
|
|
ROCKS_LOG_INFO(options_.info_log, "Failed to read %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
return s;
|
|
}
|
|
|
|
if (table_properties != nullptr) {
|
|
if (db_id != nullptr) {
|
|
db_id->assign(table_properties->db_id);
|
|
}
|
|
if (db_session_id != nullptr) {
|
|
db_session_id->assign(table_properties->db_session_id);
|
|
if (db_session_id->empty()) {
|
|
s = Status::NotFound("DB session identity not found in " + file_path);
|
|
ROCKS_LOG_INFO(options_.info_log, "%s", s.ToString().c_str());
|
|
return s;
|
|
}
|
|
}
|
|
return Status::OK();
|
|
} else {
|
|
s = Status::Corruption("Table properties missing in " + file_path);
|
|
ROCKS_LOG_INFO(options_.info_log, "%s", s.ToString().c_str());
|
|
return s;
|
|
}
|
|
}
|
|
|
|
void BackupEngineImpl::DeleteChildren(const std::string& dir,
|
|
uint32_t file_type_filter) {
|
|
std::vector<std::string> children;
|
|
db_env_->GetChildren(dir, &children).PermitUncheckedError(); // ignore errors
|
|
|
|
for (const auto& f : children) {
|
|
uint64_t number;
|
|
FileType type;
|
|
bool ok = ParseFileName(f, &number, &type);
|
|
if (ok && (file_type_filter & (1 << type))) {
|
|
// don't delete this file
|
|
continue;
|
|
}
|
|
db_env_->DeleteFile(dir + "/" + f).PermitUncheckedError(); // ignore errors
|
|
}
|
|
}
|
|
|
|
Status BackupEngineImpl::InsertPathnameToSizeBytes(
|
|
const std::string& dir, Env* env,
|
|
std::unordered_map<std::string, uint64_t>* result) {
|
|
assert(result != nullptr);
|
|
std::vector<Env::FileAttributes> files_attrs;
|
|
Status status = env->FileExists(dir);
|
|
if (status.ok()) {
|
|
status = env->GetChildrenFileAttributes(dir, &files_attrs);
|
|
} else if (status.IsNotFound()) {
|
|
// Insert no entries can be considered success
|
|
status = Status::OK();
|
|
}
|
|
const bool slash_needed = dir.empty() || dir.back() != '/';
|
|
for (const auto& file_attrs : files_attrs) {
|
|
result->emplace(dir + (slash_needed ? "/" : "") + file_attrs.name,
|
|
file_attrs.size_bytes);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
Status BackupEngineImpl::GarbageCollect() {
|
|
assert(!read_only_);
|
|
|
|
// We will make a best effort to remove all garbage even in the presence
|
|
// of inconsistencies or I/O failures that inhibit finding garbage.
|
|
Status overall_status = Status::OK();
|
|
// If all goes well, we don't need another auto-GC this session
|
|
might_need_garbage_collect_ = false;
|
|
|
|
ROCKS_LOG_INFO(options_.info_log, "Starting garbage collection");
|
|
|
|
// delete obsolete shared files
|
|
for (bool with_checksum : {false, true}) {
|
|
std::vector<std::string> shared_children;
|
|
{
|
|
std::string shared_path;
|
|
if (with_checksum) {
|
|
shared_path = GetAbsolutePath(GetSharedFileWithChecksumRel());
|
|
} else {
|
|
shared_path = GetAbsolutePath(GetSharedFileRel());
|
|
}
|
|
auto s = backup_env_->FileExists(shared_path);
|
|
if (s.ok()) {
|
|
s = backup_env_->GetChildren(shared_path, &shared_children);
|
|
} else if (s.IsNotFound()) {
|
|
s = Status::OK();
|
|
}
|
|
if (!s.ok()) {
|
|
overall_status = s;
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
for (auto& child : shared_children) {
|
|
std::string rel_fname;
|
|
if (with_checksum) {
|
|
rel_fname = GetSharedFileWithChecksumRel(child);
|
|
} else {
|
|
rel_fname = GetSharedFileRel(child);
|
|
}
|
|
auto child_itr = backuped_file_infos_.find(rel_fname);
|
|
// if it's not refcounted, delete it
|
|
if (child_itr == backuped_file_infos_.end() ||
|
|
child_itr->second->refs == 0) {
|
|
// this might be a directory, but DeleteFile will just fail in that
|
|
// case, so we're good
|
|
Status s = backup_env_->DeleteFile(GetAbsolutePath(rel_fname));
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting %s -- %s",
|
|
rel_fname.c_str(), s.ToString().c_str());
|
|
backuped_file_infos_.erase(rel_fname);
|
|
if (!s.ok()) {
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// delete obsolete private files
|
|
std::vector<std::string> private_children;
|
|
{
|
|
auto s = backup_env_->GetChildren(GetAbsolutePath(GetPrivateDirRel()),
|
|
&private_children);
|
|
if (!s.ok()) {
|
|
overall_status = s;
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
for (auto& child : private_children) {
|
|
BackupID backup_id = 0;
|
|
bool tmp_dir = child.find(".tmp") != std::string::npos;
|
|
sscanf(child.c_str(), "%u", &backup_id);
|
|
if (!tmp_dir && // if it's tmp_dir, delete it
|
|
(backup_id == 0 || backups_.find(backup_id) != backups_.end())) {
|
|
// it's either not a number or it's still alive. continue
|
|
continue;
|
|
}
|
|
// here we have to delete the dir and all its children
|
|
std::string full_private_path =
|
|
GetAbsolutePath(GetPrivateFileRel(backup_id));
|
|
std::vector<std::string> subchildren;
|
|
if (backup_env_->GetChildren(full_private_path, &subchildren).ok()) {
|
|
for (auto& subchild : subchildren) {
|
|
Status s = backup_env_->DeleteFile(full_private_path + subchild);
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting %s -- %s",
|
|
(full_private_path + subchild).c_str(),
|
|
s.ToString().c_str());
|
|
if (!s.ok()) {
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
}
|
|
// finally delete the private dir
|
|
Status s = backup_env_->DeleteDir(full_private_path);
|
|
ROCKS_LOG_INFO(options_.info_log, "Deleting dir %s -- %s",
|
|
full_private_path.c_str(), s.ToString().c_str());
|
|
if (!s.ok()) {
|
|
// Trying again later might work
|
|
might_need_garbage_collect_ = true;
|
|
}
|
|
}
|
|
|
|
assert(overall_status.ok() || might_need_garbage_collect_);
|
|
return overall_status;
|
|
}
|
|
|
|
// ------- BackupMeta class --------
|
|
|
|
Status BackupEngineImpl::BackupMeta::AddFile(
|
|
std::shared_ptr<FileInfo> file_info) {
|
|
auto itr = file_infos_->find(file_info->filename);
|
|
if (itr == file_infos_->end()) {
|
|
auto ret = file_infos_->insert({file_info->filename, file_info});
|
|
if (ret.second) {
|
|
itr = ret.first;
|
|
itr->second->refs = 1;
|
|
} else {
|
|
// if this happens, something is seriously wrong
|
|
return Status::Corruption("In memory metadata insertion error");
|
|
}
|
|
} else {
|
|
// Compare sizes, because we scanned that off the filesystem on both
|
|
// ends. This is like a check in VerifyBackup.
|
|
if (itr->second->size != file_info->size) {
|
|
std::string msg = "Size mismatch for existing backup file: ";
|
|
msg.append(file_info->filename);
|
|
msg.append(" Size in backup is " + ToString(itr->second->size) +
|
|
" while size in DB is " + ToString(file_info->size));
|
|
msg.append(
|
|
" If this DB file checks as not corrupt, try deleting old"
|
|
" backups or backing up to a different backup directory.");
|
|
return Status::Corruption(msg);
|
|
}
|
|
// Note: to save I/O, this check will pass trivially on already backed
|
|
// up files that don't have the checksum in their name. And it should
|
|
// never fail for files that do have checksum in their name.
|
|
if (itr->second->checksum_hex != file_info->checksum_hex) {
|
|
// Should never reach here, but produce an appropriate corruption
|
|
// message in case we do in a release build.
|
|
assert(false);
|
|
std::string msg = "Checksum mismatch for existing backup file: ";
|
|
msg.append(file_info->filename);
|
|
msg.append(" Expected checksum is " + itr->second->checksum_hex +
|
|
" while computed checksum is " + file_info->checksum_hex);
|
|
msg.append(
|
|
" If this DB file checks as not corrupt, try deleting old"
|
|
" backups or backing up to a different backup directory.");
|
|
return Status::Corruption(msg);
|
|
}
|
|
++itr->second->refs; // increase refcount if already present
|
|
}
|
|
|
|
size_ += file_info->size;
|
|
files_.push_back(itr->second);
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BackupEngineImpl::BackupMeta::Delete(bool delete_meta) {
|
|
Status s;
|
|
for (const auto& file : files_) {
|
|
--file->refs; // decrease refcount
|
|
}
|
|
files_.clear();
|
|
// delete meta file
|
|
if (delete_meta) {
|
|
s = env_->FileExists(meta_filename_);
|
|
if (s.ok()) {
|
|
s = env_->DeleteFile(meta_filename_);
|
|
} else if (s.IsNotFound()) {
|
|
s = Status::OK(); // nothing to delete
|
|
}
|
|
}
|
|
timestamp_ = 0;
|
|
return s;
|
|
}
|
|
|
|
Slice kMetaDataPrefix("metadata ");
|
|
|
|
// each backup meta file is of the format:
|
|
// <timestamp>
|
|
// <seq number>
|
|
// <metadata(literal string)> <metadata> (optional)
|
|
// <number of files>
|
|
// <file1> <crc32(literal string)> <crc32c_value>
|
|
// <file2> <crc32(literal string)> <crc32c_value>
|
|
// ...
|
|
Status BackupEngineImpl::BackupMeta::LoadFromFile(
|
|
const std::string& backup_dir,
|
|
const std::unordered_map<std::string, uint64_t>& abs_path_to_size) {
|
|
assert(Empty());
|
|
std::unique_ptr<LineFileReader> backup_meta_reader;
|
|
{
|
|
Status s =
|
|
LineFileReader::Create(env_->GetFileSystem(), meta_filename_,
|
|
FileOptions(), &backup_meta_reader, nullptr);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
// Failures handled at the end
|
|
std::string line;
|
|
if (backup_meta_reader->ReadLine(&line)) {
|
|
timestamp_ = std::strtoull(line.c_str(), nullptr, /*base*/ 10);
|
|
}
|
|
if (backup_meta_reader->ReadLine(&line)) {
|
|
sequence_number_ = std::strtoull(line.c_str(), nullptr, /*base*/ 10);
|
|
}
|
|
if (backup_meta_reader->ReadLine(&line)) {
|
|
Slice data = line;
|
|
if (data.starts_with(kMetaDataPrefix)) {
|
|
// app metadata present
|
|
data.remove_prefix(kMetaDataPrefix.size());
|
|
bool decode_success = data.DecodeHex(&app_metadata_);
|
|
if (!decode_success) {
|
|
return Status::Corruption(
|
|
"Failed to decode stored hex encoded app metadata");
|
|
}
|
|
line.clear();
|
|
} else {
|
|
// process the line below
|
|
}
|
|
} else {
|
|
line.clear();
|
|
}
|
|
uint32_t num_files = UINT32_MAX;
|
|
if (!line.empty() || backup_meta_reader->ReadLine(&line)) {
|
|
num_files = static_cast<uint32_t>(strtoul(line.c_str(), nullptr, 10));
|
|
}
|
|
std::vector<std::shared_ptr<FileInfo>> files;
|
|
while (backup_meta_reader->ReadLine(&line)) {
|
|
std::vector<std::string> components = StringSplit(line, ' ');
|
|
|
|
if (components.size() < 1) {
|
|
return Status::Corruption("Empty line instead of file entry.");
|
|
}
|
|
|
|
const std::string& filename = components[0];
|
|
|
|
uint64_t size;
|
|
const std::shared_ptr<FileInfo> file_info = GetFile(filename);
|
|
if (file_info) {
|
|
size = file_info->size;
|
|
} else {
|
|
std::string abs_path = backup_dir + "/" + filename;
|
|
auto e = abs_path_to_size.find(abs_path);
|
|
if (e == abs_path_to_size.end()) {
|
|
return Status::Corruption("Pathname in meta file not found on disk: " +
|
|
abs_path);
|
|
}
|
|
size = e->second;
|
|
}
|
|
|
|
if (components.size() < 3) {
|
|
return Status::Corruption("File checksum is missing for " + filename +
|
|
" in " + meta_filename_);
|
|
}
|
|
|
|
// WART: The checksums are crc32c, not original crc32
|
|
if (components[1] != "crc32") {
|
|
return Status::Corruption("Unknown checksum type for " + filename +
|
|
" in " + meta_filename_);
|
|
}
|
|
|
|
uint32_t checksum_value =
|
|
static_cast<uint32_t>(strtoul(components[2].c_str(), nullptr, 10));
|
|
if (components[2] != ROCKSDB_NAMESPACE::ToString(checksum_value)) {
|
|
return Status::Corruption("Invalid checksum value for " + filename +
|
|
" in " + meta_filename_);
|
|
}
|
|
|
|
if (components.size() > 3) {
|
|
return Status::Corruption("Extra data for entry " + filename + " in " +
|
|
meta_filename_);
|
|
}
|
|
|
|
files.emplace_back(
|
|
new FileInfo(filename, size, ChecksumInt32ToHex(checksum_value)));
|
|
}
|
|
|
|
{
|
|
Status s = backup_meta_reader->GetStatus();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (num_files != files.size()) {
|
|
return Status::Corruption(
|
|
"Inconsistent number of files or missing/incomplete header in " +
|
|
meta_filename_);
|
|
}
|
|
|
|
files_.reserve(files.size());
|
|
for (const auto& file_info : files) {
|
|
Status s = AddFile(file_info);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
|
|
Status s;
|
|
std::unique_ptr<WritableFile> backup_meta_file;
|
|
EnvOptions env_options;
|
|
env_options.use_mmap_writes = false;
|
|
env_options.use_direct_writes = false;
|
|
s = env_->NewWritableFile(meta_tmp_filename_, &backup_meta_file, env_options);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
std::ostringstream buf;
|
|
buf << static_cast<unsigned long long>(timestamp_) << "\n";
|
|
buf << sequence_number_ << "\n";
|
|
|
|
if (!app_metadata_.empty()) {
|
|
std::string hex_encoded_metadata =
|
|
Slice(app_metadata_).ToString(/* hex */ true);
|
|
buf << kMetaDataPrefix.ToString() << hex_encoded_metadata << "\n";
|
|
}
|
|
buf << files_.size() << "\n";
|
|
|
|
for (const auto& file : files_) {
|
|
// use crc32c for now, switch to something else if needed
|
|
// WART: The checksums are crc32c, not original crc32
|
|
buf << file->filename << " crc32 " << ChecksumHexToInt32(file->checksum_hex)
|
|
<< "\n";
|
|
}
|
|
|
|
s = backup_meta_file->Append(Slice(buf.str()));
|
|
if (s.ok() && sync) {
|
|
s = backup_meta_file->Sync();
|
|
}
|
|
if (s.ok()) {
|
|
s = backup_meta_file->Close();
|
|
}
|
|
if (s.ok()) {
|
|
s = env_->RenameFile(meta_tmp_filename_, meta_filename_);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// -------- BackupEngineReadOnlyImpl ---------
|
|
class BackupEngineReadOnlyImpl : public BackupEngineReadOnly {
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public:
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BackupEngineReadOnlyImpl(const BackupableDBOptions& options, Env* db_env)
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: backup_engine_(new BackupEngineImpl(options, db_env, true)) {}
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~BackupEngineReadOnlyImpl() override {}
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// The returned BackupInfos are in chronological order, which means the
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// latest backup comes last.
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void GetBackupInfo(std::vector<BackupInfo>* backup_info,
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bool include_file_details) const override {
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backup_engine_->GetBackupInfo(backup_info, include_file_details);
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}
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void GetCorruptedBackups(
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std::vector<BackupID>* corrupt_backup_ids) const override {
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backup_engine_->GetCorruptedBackups(corrupt_backup_ids);
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}
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using BackupEngineReadOnly::RestoreDBFromBackup;
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Status RestoreDBFromBackup(const RestoreOptions& options, BackupID backup_id,
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const std::string& db_dir,
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const std::string& wal_dir) override {
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return backup_engine_->RestoreDBFromBackup(options, backup_id, db_dir,
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wal_dir);
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}
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using BackupEngineReadOnly::RestoreDBFromLatestBackup;
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Status RestoreDBFromLatestBackup(const RestoreOptions& options,
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const std::string& db_dir,
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const std::string& wal_dir) override {
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return backup_engine_->RestoreDBFromLatestBackup(options, db_dir, wal_dir);
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}
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Status VerifyBackup(BackupID backup_id,
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bool verify_with_checksum = false) override {
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return backup_engine_->VerifyBackup(backup_id, verify_with_checksum);
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}
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Status Initialize() { return backup_engine_->Initialize(); }
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private:
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std::unique_ptr<BackupEngineImpl> backup_engine_;
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};
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Status BackupEngineReadOnly::Open(const BackupableDBOptions& options, Env* env,
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BackupEngineReadOnly** backup_engine_ptr) {
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if (options.destroy_old_data) {
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return Status::InvalidArgument(
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"Can't destroy old data with ReadOnly BackupEngine");
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}
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std::unique_ptr<BackupEngineReadOnlyImpl> backup_engine(
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new BackupEngineReadOnlyImpl(options, env));
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auto s = backup_engine->Initialize();
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if (!s.ok()) {
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*backup_engine_ptr = nullptr;
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return s;
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}
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*backup_engine_ptr = backup_engine.release();
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return Status::OK();
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}
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} // namespace ROCKSDB_NAMESPACE
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#endif // ROCKSDB_LITE
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