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93719fc953
rocksdb/utilities/backupable/backupable_db.cc
Peter Dillinger 93719fc953 Restore file size in backup table file names (and other cleanup) (#7400) 
Summary:
Prior to 6.12, backup files using share_files_with_checksum had
the file size encoded in the file name, after the last '\_' and before
the last '.'. We considered this an implementation detail subject to
change, and indeed removed this information from the file name (with an
option to use old behavior) because it was considered
ineffective/inefficient for file name uniqueness. However, some
downstream RocksDB users were relying on this information since the file
size is not explicitly in the backup manifest file.

This primary purpose of this change is "retrofitting" the 6.12 release
(not yet a public release) to simultaneously support the benefits of the
new naming scheme (I/O performance and data correctness at scale) and
preserve the file size information, both as default behaviors. With this
change, we are essentially making the file size information encoded in
the file name an official, though obscure, extension of the backup meta
file format.

We preserve an option (kLegacyCrc32cAndFileSize) to use the original
"legacy" naming scheme, with its caveats, and make it easy to omit the
file size information (no kFlagIncludeFileSize), for more compact file
names. But note that changing the naming scheme used on an existing db
and backup directory can lead to transient space amplification, as some
files will be stored under two names in the shared_checksum directory.
Because some backups were saved using the original 6.12 naming scheme,
we offer two ways of dealing with those files: SST files generated by
older 6.12 versions can either use the default naming scheme in effect
when the SST files were generated (kFlagMatchInterimNaming, default, no
transient space amplification) or can use a new naming scheme (no
kFlagMatchInterimNaming, potential space amplification because some
already stored files getting a new name).

We don't have a natural way to detect which files were generated by
previous 6.12 versions, but this change hacks one in by changing DB
session ids to now use a more concise encoding, reducing file name
length, saving ~dozen bytes from SST files, and making them visually
distinct from DB ids so that they are less likely to be mixed up.

Two final auxiliary notes:
Recognizing that the backup file names have become a de facto part of
the backup meta schema, this change makes them easier to parse and
extend by putting a distinct marker, 's', before DB session ids embedded
in the name. When we extend this to allow custom checksums in the name,
they can get their own marker to ensure safe parsing. For backward
compatibility, file size does not get a marker but is assumed for
`_[0-9]+[.]`

Another change from initial 6.12 default behavior is never including
file custom checksum in the file name. Looking ahead to 6.13, we do not
want the default behavior to cause backup space amplification for
someone turning on file custom checksum checking in BackupEngine; we
want that to be an easy decision. When implemented, including file
custom checksums in backup file names will be a non-default option.

Actual file name patterns and priorities, as regexes:

    kLegacyCrc32cAndFileSize OR pre-6.12 SST file ->
      [0-9]+_[0-9]+_[0-9]+[.]sst
    kFlagMatchInterimNaming set (default) AND early 6.12 SST file ->
      [0-9]+_[0-9a-fA-F-]+[.]sst
    kUseDbSessionId AND NOT kFlagIncludeFileSize ->
      [0-9]+_s[0-9A-Z]{20}[.]sst
    kUseDbSessionId AND kFlagIncludeFileSize (default) ->
      [0-9]+_s[0-9A-Z]{20}_[0-9]+[.]sst

We might add opt-in options for more '\_' separated data in the name,
but embedded file size, if present, will always be after last '\_' and
before '.sst'.

This change was originally applied to version 6.12. (See https://github.com/facebook/rocksdb/issues/7390)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7400

Test Plan:
unit tests included. Sync point callbacks are used to mimic
previous version SST files.

Reviewed By: ajkr

Differential Revision: D23759587

Pulled By: pdillinger

fbshipit-source-id: f62d8af4e0978de0a34f26288cfbe66049b70025
2020-09-17 10:24:22 -07:00

2736 lines
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef ROCKSDB_LITE
#include "rocksdb/utilities/backupable_db.h"
#include <stdlib.h>
#include <algorithm>
#include <atomic>
#include <cinttypes>
#include <functional>
#include <future>
#include <limits>
#include <map>
#include <mutex>
#include <sstream>
#include <string>
#include <thread>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "db/log_reader.h"
#include "env/composite_env_wrapper.h"
#include "file/filename.h"
#include "file/sequence_file_reader.h"
#include "file/writable_file_writer.h"
#include "logging/logging.h"
#include "port/port.h"
#include "rocksdb/rate_limiter.h"
#include "rocksdb/transaction_log.h"
#include "table/sst_file_dumper.h"
#include "test_util/sync_point.h"
#include "util/channel.h"
#include "util/coding.h"
#include "util/crc32c.h"
#include "util/file_checksum_helper.h"
#include "util/string_util.h"
#include "utilities/checkpoint/checkpoint_impl.h"
namespace ROCKSDB_NAMESPACE {
namespace {
using ShareFilesNaming = BackupableDBOptions::ShareFilesNaming;
inline uint32_t ChecksumHexToInt32(const std::string& checksum_hex) {
std::string checksum_str;
Slice(checksum_hex).DecodeHex(&checksum_str);
return EndianSwapValue(DecodeFixed32(checksum_str.c_str()));
}
inline std::string ChecksumStrToHex(const std::string& checksum_str) {
return Slice(checksum_str).ToString(true);
}
inline std::string ChecksumInt32ToHex(const uint32_t& checksum_value) {
std::string checksum_str;
PutFixed32(&checksum_str, EndianSwapValue(checksum_value));
return ChecksumStrToHex(checksum_str);
}
// Checks if the checksum function names are the same. Note that both the
// backup default checksum function and the db standard checksum function are
// crc32c although they have different names. So We treat the db standard
// checksum function name and the backup default checksum function name as
// the same name.
inline bool IsSameChecksumFunc(const std::string& dst_checksum_func_name,
const std::string& src_checksum_func_name) {
return (dst_checksum_func_name == src_checksum_func_name) ||
((dst_checksum_func_name == kDefaultBackupFileChecksumFuncName) &&
(src_checksum_func_name == kStandardDbFileChecksumFuncName)) ||
((src_checksum_func_name == kDefaultBackupFileChecksumFuncName) &&
(dst_checksum_func_name == kStandardDbFileChecksumFuncName));
}
inline bool IsSstFile(const std::string& fname) {
return fname.length() > 4 && fname.rfind(".sst") == fname.length() - 4;
}
} // namespace
void BackupStatistics::IncrementNumberSuccessBackup() {
number_success_backup++;
}
void BackupStatistics::IncrementNumberFailBackup() {
number_fail_backup++;
}
uint32_t BackupStatistics::GetNumberSuccessBackup() const {
return number_success_backup;
}
uint32_t BackupStatistics::GetNumberFailBackup() const {
return number_fail_backup;
}
std::string BackupStatistics::ToString() const {
char result[50];
snprintf(result, sizeof(result), "# success backup: %u, # fail backup: %u",
GetNumberSuccessBackup(), GetNumberFailBackup());
return result;
}
void BackupableDBOptions::Dump(Logger* logger) const {
ROCKS_LOG_INFO(logger, " Options.backup_dir: %s",
backup_dir.c_str());
ROCKS_LOG_INFO(logger, " Options.backup_env: %p", backup_env);
ROCKS_LOG_INFO(logger, " Options.share_table_files: %d",
static_cast<int>(share_table_files));
ROCKS_LOG_INFO(logger, " Options.info_log: %p", info_log);
ROCKS_LOG_INFO(logger, " Options.sync: %d",
static_cast<int>(sync));
ROCKS_LOG_INFO(logger, " Options.destroy_old_data: %d",
static_cast<int>(destroy_old_data));
ROCKS_LOG_INFO(logger, " Options.backup_log_files: %d",
static_cast<int>(backup_log_files));
ROCKS_LOG_INFO(logger, " Options.backup_rate_limit: %" PRIu64,
backup_rate_limit);
ROCKS_LOG_INFO(logger, " Options.restore_rate_limit: %" PRIu64,
restore_rate_limit);
ROCKS_LOG_INFO(logger, "Options.max_background_operations: %d",
max_background_operations);
}
// -------- BackupEngineImpl class ---------
class BackupEngineImpl : public BackupEngine {
public:
BackupEngineImpl(const BackupableDBOptions& options, Env* db_env,
bool read_only = false);
~BackupEngineImpl() override;
using BackupEngine::CreateNewBackupWithMetadata;
Status CreateNewBackupWithMetadata(const CreateBackupOptions& options, DB* db,
const std::string& app_metadata) override;
Status PurgeOldBackups(uint32_t num_backups_to_keep) override;
Status DeleteBackup(BackupID backup_id) override;
void StopBackup() override {
stop_backup_.store(true, std::memory_order_release);
}
Status GarbageCollect() override;
// The returned BackupInfos are in chronological order, which means the
// latest backup comes last.
void GetBackupInfo(std::vector<BackupInfo>* backup_info) override;
void GetCorruptedBackups(std::vector<BackupID>* corrupt_backup_ids) override;
using BackupEngine::RestoreDBFromBackup;
Status RestoreDBFromBackup(const RestoreOptions& options, BackupID backup_id,
const std::string& db_dir,
const std::string& wal_dir) override;
using BackupEngine::RestoreDBFromLatestBackup;
Status RestoreDBFromLatestBackup(const RestoreOptions& options,
const std::string& db_dir,
const std::string& wal_dir) override {
return RestoreDBFromBackup(options, latest_valid_backup_id_, db_dir,
wal_dir);
}
Status VerifyBackup(BackupID backup_id,
bool verify_with_checksum = false) override;
Status Initialize();
ShareFilesNaming GetNamingNoFlags() const {
return options_.share_files_with_checksum_naming &
BackupableDBOptions::kMaskNoNamingFlags;
}
ShareFilesNaming GetNamingFlags() const {
return options_.share_files_with_checksum_naming &
BackupableDBOptions::kMaskNamingFlags;
}
private:
void DeleteChildren(const std::string& dir, uint32_t file_type_filter = 0);
Status DeleteBackupInternal(BackupID backup_id);
// Extends the "result" map with pathname->size mappings for the contents of
// "dir" in "env". Pathnames are prefixed with "dir".
Status InsertPathnameToSizeBytes(
const std::string& dir, Env* env,
std::unordered_map<std::string, uint64_t>* result);
struct FileInfo {
FileInfo(const std::string& fname, uint64_t sz, const std::string& checksum,
const std::string& custom_checksum,
const std::string& checksum_name, const std::string& id = "",
const std::string& sid = "")
: refs(0),
filename(fname),
size(sz),
checksum_hex(checksum),
custom_checksum_hex(custom_checksum),
checksum_func_name(checksum_name),
db_id(id),
db_session_id(sid) {}
FileInfo(const FileInfo&) = delete;
FileInfo& operator=(const FileInfo&) = delete;
int refs;
const std::string filename;
const uint64_t size;
const std::string checksum_hex;
const std::string custom_checksum_hex;
const std::string checksum_func_name;
// DB identities
// db_id is obtained for potential usage in the future but not used
// currently
const std::string db_id;
// db_session_id appears in the backup SST filename if the table naming
// option is kUseDbSessionId
const std::string db_session_id;
};
class BackupMeta {
public:
BackupMeta(
const std::string& meta_filename, const std::string& meta_tmp_filename,
std::unordered_map<std::string, std::shared_ptr<FileInfo>>* file_infos,
Env* env)
: timestamp_(0),
sequence_number_(0),
size_(0),
meta_filename_(meta_filename),
meta_tmp_filename_(meta_tmp_filename),
file_infos_(file_infos),
env_(env) {}
BackupMeta(const BackupMeta&) = delete;
BackupMeta& operator=(const BackupMeta&) = delete;
~BackupMeta() {}
void RecordTimestamp() {
env_->GetCurrentTime(&timestamp_);
}
int64_t GetTimestamp() const {
return timestamp_;
}
uint64_t GetSize() const {
return size_;
}
uint32_t GetNumberFiles() { return static_cast<uint32_t>(files_.size()); }
void SetSequenceNumber(uint64_t sequence_number) {
sequence_number_ = sequence_number;
}
uint64_t GetSequenceNumber() {
return sequence_number_;
}
const std::string& GetAppMetadata() const { return app_metadata_; }
void SetAppMetadata(const std::string& app_metadata) {
app_metadata_ = app_metadata;
}
Status AddFile(std::shared_ptr<FileInfo> file_info);
Status Delete(bool delete_meta = true);
bool Empty() {
return files_.empty();
}
std::shared_ptr<FileInfo> GetFile(const std::string& filename) const {
auto it = file_infos_->find(filename);
if (it == file_infos_->end())
return nullptr;
return it->second;
}
const std::vector<std::shared_ptr<FileInfo>>& GetFiles() {
return files_;
}
// @param abs_path_to_size Pre-fetched file sizes (bytes).
Status LoadFromFile(
const std::string& backup_dir,
const std::unordered_map<std::string, uint64_t>& abs_path_to_size);
Status StoreToFile(bool sync);
std::string GetInfoString() {
std::ostringstream ss;
ss << "Timestamp: " << timestamp_ << std::endl;
char human_size[16];
AppendHumanBytes(size_, human_size, sizeof(human_size));
ss << "Size: " << human_size << std::endl;
ss << "Files:" << std::endl;
for (const auto& file : files_) {
AppendHumanBytes(file->size, human_size, sizeof(human_size));
ss << file->filename << ", size " << human_size << ", refs "
<< file->refs << std::endl;
}
return ss.str();
}
private:
int64_t timestamp_;
// sequence number is only approximate, should not be used
// by clients
uint64_t sequence_number_;
uint64_t size_;
std::string app_metadata_;
std::string const meta_filename_;
std::string const meta_tmp_filename_;
// files with relative paths (without "/" prefix!!)
std::vector<std::shared_ptr<FileInfo>> files_;
std::unordered_map<std::string, std::shared_ptr<FileInfo>>* file_infos_;
Env* env_;
static const size_t max_backup_meta_file_size_ = 10 * 1024 * 1024; // 10MB
}; // BackupMeta
inline std::string GetAbsolutePath(
const std::string &relative_path = "") const {
assert(relative_path.size() == 0 || relative_path[0] != '/');
return options_.backup_dir + "/" + relative_path;
}
inline std::string GetPrivateDirRel() const {
return "private";
}
inline std::string GetSharedDirRel() const { return "shared"; }
inline std::string GetSharedChecksumDirRel() const {
return "shared_checksum";
}
inline std::string GetPrivateFileRel(BackupID backup_id,
bool tmp = false,
const std::string& file = "") const {
assert(file.size() == 0 || file[0] != '/');
return GetPrivateDirRel() + "/" + ROCKSDB_NAMESPACE::ToString(backup_id) +
(tmp ? ".tmp" : "") + "/" + file;
}
inline std::string GetSharedFileRel(const std::string& file = "",
bool tmp = false) const {
assert(file.size() == 0 || file[0] != '/');
return GetSharedDirRel() + "/" + (tmp ? "." : "") + file +
(tmp ? ".tmp" : "");
}
inline std::string GetSharedFileWithChecksumRel(const std::string& file = "",
bool tmp = false) const {
assert(file.size() == 0 || file[0] != '/');
return GetSharedChecksumDirRel() + "/" + (tmp ? "." : "") + file +
(tmp ? ".tmp" : "");
}
inline bool UseLegacyNaming(const std::string& sid) const {
return GetNamingNoFlags() ==
BackupableDBOptions::kLegacyCrc32cAndFileSize ||
sid.empty();
}
inline bool UseInterimNaming(const std::string& sid) const {
// The indicator of SST file from early internal 6.12 release
// is a '-' in the DB session id. DB session id was made more
// concise without '-' after that.
return (GetNamingFlags() & BackupableDBOptions::kFlagMatchInterimNaming) &&
sid.find('-') != std::string::npos;
}
inline std::string GetSharedFileWithChecksum(
const std::string& file, bool has_checksum,
const std::string& checksum_hex, const uint64_t file_size,
const std::string& db_session_id) const {
assert(file.size() == 0 || file[0] != '/');
std::string file_copy = file;
if (UseLegacyNaming(db_session_id)) {
assert(has_checksum);
(void)has_checksum;
file_copy.insert(file_copy.find_last_of('.'),
"_" + ToString(ChecksumHexToInt32(checksum_hex)) + "_" +
ToString(file_size));
} else if (UseInterimNaming(db_session_id)) {
file_copy.insert(file_copy.find_last_of('.'), "_" + db_session_id);
} else {
file_copy.insert(file_copy.find_last_of('.'), "_s" + db_session_id);
if (GetNamingFlags() & BackupableDBOptions::kFlagIncludeFileSize) {
file_copy.insert(file_copy.find_last_of('.'),
"_" + ToString(file_size));
}
}
return file_copy;
}
inline std::string GetFileFromChecksumFile(const std::string& file) const {
assert(file.size() == 0 || file[0] != '/');
std::string file_copy = file;
size_t first_underscore = file_copy.find_first_of('_');
return file_copy.erase(first_underscore,
file_copy.find_last_of('.') - first_underscore);
}
inline std::string GetBackupMetaDir() const {
return GetAbsolutePath("meta");
}
inline std::string GetBackupMetaFile(BackupID backup_id, bool tmp) const {
return GetBackupMetaDir() + "/" + (tmp ? "." : "") +
ROCKSDB_NAMESPACE::ToString(backup_id) + (tmp ? ".tmp" : "");
}
inline Status GetFileNameInfo(const std::string& file,
std::string& local_name, uint64_t& number,
FileType& type) const {
// 1. extract the filename
size_t last_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(last_slash != std::string::npos);
local_name = file.substr(last_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, last_slash) == GetSharedChecksumDirRel()) {
local_name = GetFileFromChecksumFile(local_name);
}
// 2. find the filetype
bool ok = ParseFileName(local_name, &number, &type);
if (!ok) {
return Status::Corruption("Backup corrupted: Fail to parse filename " +
local_name);
}
return Status::OK();
}
inline bool HasCustomChecksumGenFactory() const {
return options_.file_checksum_gen_factory != nullptr;
}
// Returns nullptr if file_checksum_gen_factory is not set or
// file_checksum_gen_factory is not able to create a generator with
// name being requested_checksum_func_name
inline std::unique_ptr<FileChecksumGenerator> GetCustomChecksumGenerator(
const std::string& requested_checksum_func_name = "") const {
std::shared_ptr<FileChecksumGenFactory> checksum_factory =
options_.file_checksum_gen_factory;
if (checksum_factory == nullptr) {
return nullptr;
} else {
FileChecksumGenContext gen_context;
gen_context.requested_checksum_func_name = requested_checksum_func_name;
return checksum_factory->CreateFileChecksumGenerator(gen_context);
}
}
// Set the checksum generator by the requested checksum function name
inline Status SetChecksumGenerator(
const std::string& requested_checksum_func_name,
std::unique_ptr<FileChecksumGenerator>& checksum_func) {
if (requested_checksum_func_name != kDefaultBackupFileChecksumFuncName) {
if (!HasCustomChecksumGenFactory()) {
// No custom checksum factory indicates users would like to use the
// backup default checksum function and accept the degraded data
// integrity checking
return Status::OK();
} else {
checksum_func =
GetCustomChecksumGenerator(requested_checksum_func_name);
// we will use the default backup checksum function if the custom
// checksum functions is the db standard checksum function but is not
// found in the checksum factory passed in; otherwise, we return
// Status::InvalidArgument()
if (checksum_func == nullptr &&
requested_checksum_func_name != kStandardDbFileChecksumFuncName) {
return Status::InvalidArgument("Checksum checksum function " +
requested_checksum_func_name +
" not found");
}
}
}
// The requested checksum function is the default backup checksum function
return Status::OK();
}
// If size_limit == 0, there is no size limit, copy everything.
//
// Exactly one of src and contents must be non-empty.
//
// @param src If non-empty, the file is copied from this pathname.
// @param contents If non-empty, the file will be created with these contents.
Status 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,
const std::string& backup_checksum_func_name, uint64_t* size = nullptr,
std::string* checksum_hex = nullptr,
std::string* custom_checksum_hex = nullptr, uint64_t size_limit = 0,
std::function<void()> progress_callback = []() {});
Status CalculateChecksum(
const std::string& src, Env* src_env, const EnvOptions& src_env_options,
uint64_t size_limit, std::string* checksum_hex,
const std::unique_ptr<FileChecksumGenerator>& checksum_func = nullptr,
std::string* custom_checksum_hex = nullptr);
// Obtain db_id and db_session_id from the table properties of file_path
Status GetFileDbIdentities(Env* src_env, const EnvOptions& src_env_options,
const std::string& file_path, std::string* db_id,
std::string* db_session_id);
Status GetFileChecksumsFromManifestInBackup(Env* src_env,
const BackupID& backup_id,
const BackupMeta* backup,
FileChecksumList* checksum_list);
Status VerifyFileWithCrc32c(Env* src_env, const BackupMeta* backup,
const std::string& rel_path);
struct LogReporter : public log::Reader::Reporter {
Status* status;
virtual void Corruption(size_t /*bytes*/, const Status& s) override {
if (status->ok()) {
*status = s;
}
}
};
struct CopyOrCreateResult {
uint64_t size;
std::string checksum_hex;
std::string custom_checksum_hex;
std::string checksum_func_name;
std::string db_id;
std::string db_session_id;
Status status;
};
// Exactly one of src_path and contents must be non-empty. If src_path is
// non-empty, the file is copied from this pathname. Otherwise, if contents is
// non-empty, the file will be created at dst_path with these contents.
struct 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::promise<CopyOrCreateResult> result;
std::function<void()> progress_callback;
bool verify_checksum_after_work;
std::string src_checksum_func_name;
std::string src_checksum_hex;
std::string backup_checksum_func_name;
std::string db_id;
std::string db_session_id;
CopyOrCreateWorkItem()
: src_path(""),
dst_path(""),
contents(""),
src_env(nullptr),
dst_env(nullptr),
src_env_options(),
sync(false),
rate_limiter(nullptr),
size_limit(0),
verify_checksum_after_work(false),
src_checksum_func_name(kUnknownFileChecksumFuncName),
src_checksum_hex(""),
backup_checksum_func_name(kUnknownFileChecksumFuncName),
db_id(""),
db_session_id("") {}
CopyOrCreateWorkItem(const CopyOrCreateWorkItem&) = delete;
CopyOrCreateWorkItem& operator=(const CopyOrCreateWorkItem&) = delete;
CopyOrCreateWorkItem(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
*this = std::move(o);
}
CopyOrCreateWorkItem& operator=(CopyOrCreateWorkItem&& o) ROCKSDB_NOEXCEPT {
src_path = std::move(o.src_path);
dst_path = std::move(o.dst_path);
contents = std::move(o.contents);
src_env = o.src_env;
dst_env = o.dst_env;
src_env_options = std::move(o.src_env_options);
sync = o.sync;
rate_limiter = o.rate_limiter;
size_limit = o.size_limit;
result = std::move(o.result);
progress_callback = std::move(o.progress_callback);
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);
backup_checksum_func_name = std::move(o.backup_checksum_func_name);
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& _backup_checksum_func_name =
kUnknownFileChecksumFuncName,
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),
backup_checksum_func_name(_backup_checksum_func_name),
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);
}
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) {
if (file == "." || file == "..") {
continue;
}
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);
InsertPathnameToSizeBytes(abs_dir, backup_env_, &abs_path_to_size);
}
// 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
InsertPathnameToSizeBytes(
GetAbsolutePath(GetPrivateFileRel(backup_iter->first)), backup_env_,
&abs_path_to_size);
Status 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,
work_item.backup_checksum_func_name, &result.size,
&result.checksum_hex, &result.custom_checksum_hex,
work_item.size_limit, work_item.progress_callback);
result.checksum_func_name = work_item.backup_checksum_func_name;
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) {
// work_item.verify_checksum_after_work being true means backup engine
// has obtained its crc32c and/or custom checksum for the table file.
// Therefore, we can try to compare the checksums if possible.
if (work_item.src_checksum_func_name ==
kUnknownFileChecksumFuncName ||
IsSameChecksumFunc(result.checksum_func_name,
work_item.src_checksum_func_name)) {
std::string checksum_to_compare;
std::string checksum_func_name_used;
if (work_item.src_checksum_func_name ==
kUnknownFileChecksumFuncName ||
work_item.src_checksum_func_name ==
kStandardDbFileChecksumFuncName) {
// kUnknownFileChecksumFuncName implies no table file checksums in
// db manifest, but we can compare using the crc32c checksum
checksum_to_compare = result.checksum_hex;
checksum_func_name_used = kStandardDbFileChecksumFuncName;
} else {
checksum_to_compare = result.custom_checksum_hex;
checksum_func_name_used = work_item.src_checksum_func_name;
}
if (work_item.src_checksum_hex != checksum_to_compare) {
std::string checksum_info(
"Expected checksum is " + work_item.src_checksum_hex +
" while computed checksum is " + checksum_to_compare);
result.status = Status::Corruption(
checksum_func_name_used + " 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 " +
result.checksum_func_name);
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;
new_backup->RecordTimestamp();
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 (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
db->DisableFileDeletions();
if (s.ok()) {
CheckpointImpl checkpoint(db);
uint64_t sequence_number = 0;
DBOptions db_options = db->GetDBOptions();
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 == kLogFile && !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 kLogFile:
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,
db_options.file_checksum_gen_factory == nullptr ? false : true);
if (s.ok()) {
new_backup->SetSequenceNumber(sequence_number);
}
}
ROCKS_LOG_INFO(options_.info_log,
"add files for backup done (%s), wait finish.",
s.ok() ? "OK" : "not OK");
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.custom_checksum_hex, result.checksum_func_name, result.db_id,
result.db_session_id));
}
if (s.ok() && !item_status.ok()) {
s = item_status;
}
}
// we copied all the files, enable file deletions
db->EnableFileDeletions(false);
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);
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()) {
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_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) {
assert(initialized_);
backup_info->reserve(backups_.size());
for (auto& backup : backups_) {
if (!backup.second->Empty()) {
backup_info->push_back(BackupInfo(
backup.first, backup.second->GetTimestamp(), backup.second->GetSize(),
backup.second->GetNumberFiles(), backup.second->GetAppMetadata()));
}
}
}
void
BackupEngineImpl::GetCorruptedBackups(
std::vector<BackupID>* corrupt_backup_ids) {
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);
db_env_->CreateDirIfMissing(wal_dir);
if (options.keep_log_files) {
// delete files in db_dir, but keep all the log files
DeleteChildren(db_dir, 1 << kLogFile);
// 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); // ignore errors
for (const auto& f : archive_files) {
uint64_t number;
FileType type;
bool ok = ParseFileName(f, &number, &type);
if (ok && type == kLogFile) {
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);
}
Status s;
// Try to obtain checksum info from backuped DB MANIFEST
// The checksum info will be used for validating the checksums of the table
// files after restoration, in addtion to the default backup engine crc32c
// checksums.
std::unique_ptr<FileChecksumList> checksum_list(NewFileChecksumList());
s = GetFileChecksumsFromManifestInBackup(backup_env_, backup_id, backup.get(),
checksum_list.get());
if (!s.ok()) {
return s;
}
RateLimiter* rate_limiter = options_.restore_rate_limiter.get();
if (rate_limiter) {
copy_file_buffer_size_ =
static_cast<size_t>(rate_limiter->GetSingleBurstBytes());
}
std::vector<RestoreAfterCopyOrCreateWorkItem> restore_items_to_finish;
for (const auto& file_info : backup->GetFiles()) {
const std::string& file = file_info->filename;
std::string dst;
uint64_t number;
FileType type;
s = GetFileNameInfo(file, dst, number, type);
if (!s.ok()) {
return s;
}
std::string src_checksum_func_name = kUnknownFileChecksumFuncName;
std::string src_checksum_str = kUnknownFileChecksum;
std::string src_checksum_hex;
bool has_manifest_checksum = false;
if (type == kTableFile) {
Status file_checksum_status = checksum_list->SearchOneFileChecksum(
number, &src_checksum_str, &src_checksum_func_name);
if (file_checksum_status.ok() &&
src_checksum_str != kUnknownFileChecksum &&
src_checksum_func_name != kUnknownFileChecksumFuncName) {
src_checksum_hex = ChecksumStrToHex(src_checksum_str);
has_manifest_checksum = true;
}
}
// Construct the final path
// kLogFile lives in wal_dir and all the rest live in db_dir
dst = ((type == kLogFile) ? wal_dir : db_dir) +
"/" + dst;
ROCKS_LOG_INFO(options_.info_log, "Restoring %s to %s\n", file.c_str(),
dst.c_str());
std::string backup_checksum_func_name = file_info->checksum_func_name;
std::unique_ptr<FileChecksumGenerator> checksum_func;
if (src_checksum_func_name != kUnknownFileChecksumFuncName) {
s = SetChecksumGenerator(src_checksum_func_name, checksum_func);
if (!s.ok()) {
return s;
}
if (checksum_func != nullptr) {
backup_checksum_func_name = checksum_func->Name();
}
}
CopyOrCreateWorkItem copy_or_create_work_item(
GetAbsolutePath(file), dst, "" /* contents */, backup_env_, db_env_,
EnvOptions() /* src_env_options */, false, rate_limiter,
0 /* size_limit */, []() {} /* progress_callback */,
has_manifest_checksum, src_checksum_func_name, src_checksum_hex,
backup_checksum_func_name);
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) {
// Compare crc32c checksums (especially for non-table files)
std::string checksum_info("Expected checksum is " + item.checksum_hex +
" while computed checksum is " +
result.checksum_hex);
s = Status::Corruption("Crc32c checksum check failed: " + checksum_info);
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);
InsertPathnameToSizeBytes(abs_dir, backup_env_, &curr_abs_path_to_size);
}
Status s;
std::unique_ptr<FileChecksumList> checksum_list(NewFileChecksumList());
if (verify_with_checksum) {
// Try to obtain checksum info from backuped DB MANIFEST
s = GetFileChecksumsFromManifestInBackup(backup_env_, backup_id,
backup.get(), checksum_list.get());
if (!s.ok()) {
return s;
}
}
// 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
// try setting checksum_func
std::unique_ptr<FileChecksumGenerator> checksum_func;
std::string src_checksum_func_name = kUnknownFileChecksumFuncName;
std::string src_checksum_str = kUnknownFileChecksum;
std::string src_checksum_hex;
if (IsSstFile(file_info->filename)) {
const std::string& file = file_info->filename;
std::string local_name;
uint64_t number;
FileType type;
s = GetFileNameInfo(file, local_name, number, type);
if (!s.ok()) {
return s;
}
assert(type == kTableFile);
// Try to get checksum for the table file
Status file_checksum_status = checksum_list->SearchOneFileChecksum(
number, &src_checksum_str, &src_checksum_func_name);
if (file_checksum_status.ok() &&
src_checksum_str != kUnknownFileChecksum &&
src_checksum_func_name != kUnknownFileChecksumFuncName) {
s = SetChecksumGenerator(src_checksum_func_name, checksum_func);
if (!s.ok()) {
return s;
}
src_checksum_hex = ChecksumStrToHex(src_checksum_str);
}
}
ROCKS_LOG_INFO(options_.info_log, "Verifying %s checksum...\n",
abs_path.c_str());
std::string checksum_hex;
std::string custom_checksum_hex;
CalculateChecksum(abs_path, backup_env_, EnvOptions(), 0 /* size_limit */,
&checksum_hex, checksum_func, &custom_checksum_hex);
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: crc32c mismatch for " +
abs_path + ": " + checksum_info);
}
if (checksum_func != nullptr && src_checksum_hex != custom_checksum_hex) {
std::string checksum_info("Expected checksum is " + src_checksum_hex +
" while computed checksum is " +
custom_checksum_hex);
return Status::Corruption("File corrupted: " + src_checksum_func_name +
" 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, const std::string& backup_checksum_func_name,
uint64_t* size, std::string* checksum_hex, std::string* custom_checksum_hex,
uint64_t size_limit, std::function<void()> progress_callback) {
assert(src.empty() != contents.empty());
Status s;
std::unique_ptr<WritableFile> dst_file;
std::unique_ptr<SequentialFile> src_file;
EnvOptions dst_env_options;
dst_env_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;
// Get custom checksum function
std::unique_ptr<FileChecksumGenerator> checksum_func;
s = SetChecksumGenerator(backup_checksum_func_name, checksum_func);
if (!s.ok()) {
return s;
}
// 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->NewWritableFile(dst, &dst_file, dst_env_options);
if (s.ok() && !src.empty()) {
s = src_env->NewSequentialFile(src, &src_file, src_env_options);
}
if (!s.ok()) {
return s;
}
std::unique_ptr<WritableFileWriter> dest_writer(new WritableFileWriter(
NewLegacyWritableFileWrapper(std::move(dst_file)), dst, dst_env_options));
std::unique_ptr<SequentialFileReader> src_reader;
std::unique_ptr<char[]> buf;
if (!src.empty()) {
src_reader.reset(new SequentialFileReader(
NewLegacySequentialFileWrapper(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());
}
if (checksum_func != nullptr && custom_checksum_hex != nullptr) {
checksum_func->Update(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);
if (checksum_hex != nullptr) {
// Convert uint32_t checksum to hex checksum
checksum_hex->assign(ChecksumInt32ToHex(checksum_value));
}
if (checksum_func != nullptr && custom_checksum_hex != nullptr) {
checksum_func->Finalize();
custom_checksum_hex->assign(ChecksumStrToHex(checksum_func->GetChecksum()));
}
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;
Status s;
std::string checksum_hex;
std::string custom_checksum_hex;
// The function name of backup checksum function.
std::string backup_checksum_func_name = kDefaultBackupFileChecksumFuncName;
std::string db_id;
std::string db_session_id;
// whether a default or custom checksum for a table file is available
bool has_checksum = false;
// Set up the custom checksum function.
// A nullptr checksum_func indicates the default backup checksum function
// will be used. If checksum_func is not nullptr, then both the default
// backup checksum function and checksum_func will be used.
std::unique_ptr<FileChecksumGenerator> checksum_func;
if (src_checksum_func_name != kUnknownFileChecksumFuncName) {
// DB files have checksum functions
s = SetChecksumGenerator(src_checksum_func_name, checksum_func);
if (!s.ok()) {
return s;
}
if (checksum_func != nullptr) {
backup_checksum_func_name = checksum_func->Name();
}
}
// Whenever the db checksum function name matches the backup engine custom
// checksum function name, we will compare the checksum values after copying.
// Note that only table files may have a known checksum name passed in.
//
// If the checksum function names do not match 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 a known checksum function name is passed in
if (IsSameChecksumFunc(backup_checksum_func_name, src_checksum_func_name)) {
if (src_checksum_str == kUnknownFileChecksum) {
return Status::Aborted("Unknown checksum value for " + fname);
}
if (checksum_func == nullptr) {
checksum_hex = ChecksumStrToHex(src_checksum_str);
} else {
custom_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);
}
// 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()) {
s = CalculateChecksum(src_dir + fname, db_env_, src_env_options,
size_limit, &checksum_hex, checksum_func,
&custom_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
//
// Also, we display custom checksums in the name if possible.
dst_relative = GetSharedFileWithChecksum(
dst_relative, has_checksum,
checksum_func == nullptr || UseLegacyNaming(db_session_id)
? checksum_hex
: custom_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 {
assert(s.IsIOError());
return exist;
}
}
if (!contents.empty()) {
need_to_copy = false;
} else if (shared && (same_path || file_exists)) {
need_to_copy = false;
if (shared_checksum) {
if (backuped_file_infos_.find(dst_relative) ==
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;
backup_env_->DeleteFile(final_dest_path);
} else {
// file exists and referenced
if (!has_checksum || checksum_hex.empty()) {
// Either both checksum_hex and custom_checksum_hex need recalculating
// or only checksum_hex needs recalculating
// FIXME(peterd): extra I/O
s = CalculateChecksum(
src_dir + fname, db_env_, src_env_options, size_limit,
&checksum_hex, checksum_func,
checksum_hex.empty() ? nullptr : &custom_checksum_hex);
if (!s.ok()) {
return s;
}
has_checksum = true;
}
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);
}
}
if (checksum_func != nullptr) {
ROCKS_LOG_INFO(options_.info_log, "%s checksum is %s",
backup_checksum_func_name.c_str(),
custom_checksum_hex.c_str());
}
} else if (backuped_file_infos_.find(dst_relative) ==
backuped_file_infos_.end() &&
!same_path) {
// file already exists, but it's not referenced by any backup. overwrite
// the file
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;
backup_env_->DeleteFile(final_dest_path);
} else {
// the file is present and referenced by a backup
ROCKS_LOG_INFO(options_.info_log,
"%s already present, calculate checksum", fname.c_str());
if (!has_checksum || checksum_hex.empty()) {
// Either both checksum_hex and custom_checksum_hex need recalculating
// or only checksum_hex needs recalculating
// FIXME(peterd): extra I/O
s = CalculateChecksum(
src_dir + fname, db_env_, src_env_options, size_limit,
&checksum_hex, checksum_func,
checksum_hex.empty() ? nullptr : &custom_checksum_hex);
if (!s.ok()) {
return s;
}
has_checksum = true;
}
}
}
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_func == nullptr ? checksum_hex : custom_checksum_hex,
backup_checksum_func_name, 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 = s;
result.size = size_bytes;
result.checksum_hex = std::move(checksum_hex);
result.custom_checksum_hex = std::move(custom_checksum_hex);
result.checksum_func_name = std::move(backup_checksum_func_name);
result.db_id = std::move(db_id);
result.db_session_id = std::move(db_session_id);
promise_result.set_value(std::move(result));
}
return s;
}
Status BackupEngineImpl::CalculateChecksum(
const std::string& src, Env* src_env, const EnvOptions& src_env_options,
uint64_t size_limit, std::string* checksum_hex,
const std::unique_ptr<FileChecksumGenerator>& checksum_func,
std::string* custom_checksum_hex) {
if (checksum_hex == nullptr) {
return Status::InvalidArgument("Checksum pointer is null");
}
uint32_t checksum_value = 0;
if (size_limit == 0) {
size_limit = std::numeric_limits<uint64_t>::max();
}
std::unique_ptr<SequentialFile> src_file;
Status s = src_env->NewSequentialFile(src, &src_file, src_env_options);
if (!s.ok()) {
return s;
}
std::unique_ptr<SequentialFileReader> src_reader(
new SequentialFileReader(NewLegacySequentialFileWrapper(src_file), src));
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());
if (checksum_func != nullptr && custom_checksum_hex != nullptr) {
checksum_func->Update(data.data(), data.size());
}
} while (data.size() > 0 && size_limit > 0);
checksum_hex->assign(ChecksumInt32ToHex(checksum_value));
if (checksum_func != nullptr && custom_checksum_hex != nullptr) {
checksum_func->Finalize();
custom_checksum_hex->assign(ChecksumStrToHex(checksum_func->GetChecksum()));
}
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;
}
}
Status BackupEngineImpl::GetFileChecksumsFromManifestInBackup(
Env* src_env, const BackupID& backup_id, const BackupMeta* backup,
FileChecksumList* checksum_list) {
if (checksum_list == nullptr) {
return Status::InvalidArgument("checksum_list is nullptr");
}
checksum_list->reset();
Status s;
// Read CURRENT file to get the latest DB MANIFEST filename in backup_id
// and then read the the MANIFEST file to obtain the checksum info stored
// in the file.
std::string current_rel_path =
GetPrivateFileRel(backup_id, false /* tmp */, "CURRENT");
s = VerifyFileWithCrc32c(src_env, backup, current_rel_path);
if (!s.ok()) {
return s;
}
std::string manifest_filename;
s = ReadFileToString(src_env, GetAbsolutePath(current_rel_path),
&manifest_filename);
if (!s.ok()) {
return s;
}
// Remove tailing '\n' if any
while (!manifest_filename.empty() && manifest_filename.back() == '\n') {
manifest_filename.pop_back();
}
std::string manifest_rel_path =
GetPrivateFileRel(backup_id, false /* tmp */, manifest_filename);
s = VerifyFileWithCrc32c(src_env, backup, manifest_rel_path);
if (!s.ok()) {
return s;
}
// Read whole manifest file in backup
s = GetFileChecksumsFromManifest(
src_env, GetAbsolutePath(manifest_rel_path),
std::numeric_limits<uint64_t>::max() /*manifest_file_size*/,
checksum_list);
return s;
}
Status BackupEngineImpl::VerifyFileWithCrc32c(Env* src_env,
const BackupMeta* backup,
const std::string& rel_path) {
const std::shared_ptr<FileInfo> file_info = backup->GetFile(rel_path);
if (file_info == nullptr) {
return Status::Corruption(rel_path + " is missing");
}
std::string abs_path = GetAbsolutePath(rel_path);
std::string expected_checksum = file_info->checksum_hex;
std::string actual_checksum;
Status s = CalculateChecksum(abs_path, src_env, EnvOptions(),
0 /* size_limit */, &actual_checksum);
if (!s.ok()) {
return s;
}
if (actual_checksum != expected_checksum) {
std::string checksum_info("Expected checksum is " + expected_checksum +
" while computed checksum is " + actual_checksum);
return Status::Corruption("crc32c mismatch for " + rel_path + ": " +
checksum_info);
}
return s;
}
void BackupEngineImpl::DeleteChildren(const std::string& dir,
uint32_t file_type_filter) {
std::vector<std::string> children;
db_env_->GetChildren(dir, &children); // 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); // 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) {
if (child == "." || child == "..") {
continue;
}
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) {
if (child == "." || child == "..") {
continue;
}
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;
backup_env_->GetChildren(full_private_path, &subchildren);
for (auto& subchild : subchildren) {
if (subchild == "." || subchild == "..") {
continue;
}
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 {
if (itr->second->checksum_hex != file_info->checksum_hex) {
return Status::Corruption(
"Checksum mismatch for existing backup file. Delete old backups and "
"try again.");
} else if (IsSameChecksumFunc(itr->second->checksum_func_name,
file_info->checksum_func_name) &&
!itr->second->custom_checksum_hex.empty() &&
itr->second->custom_checksum_hex !=
file_info->custom_checksum_hex) {
return Status::Corruption(
"Custom checksum mismatch for existing backup file. Delete old "
"backups and try again.");
}
++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());
Status s;
std::unique_ptr<SequentialFile> backup_meta_file;
s = env_->NewSequentialFile(meta_filename_, &backup_meta_file, EnvOptions());
if (!s.ok()) {
return s;
}
std::unique_ptr<SequentialFileReader> backup_meta_reader(
new SequentialFileReader(NewLegacySequentialFileWrapper(backup_meta_file),
meta_filename_));
std::unique_ptr<char[]> buf(new char[max_backup_meta_file_size_ + 1]);
Slice data;
s = backup_meta_reader->Read(max_backup_meta_file_size_, &data, buf.get());
if (!s.ok() || data.size() == max_backup_meta_file_size_) {
return s.ok() ? Status::Corruption("File size too big") : s;
}
buf[data.size()] = 0;
uint32_t num_files = 0;
char *next;
timestamp_ = strtoull(data.data(), &next, 10);
data.remove_prefix(next - data.data() + 1); // +1 for '\n'
sequence_number_ = strtoull(data.data(), &next, 10);
data.remove_prefix(next - data.data() + 1); // +1 for '\n'
if (data.starts_with(kMetaDataPrefix)) {
// app metadata present
data.remove_prefix(kMetaDataPrefix.size());
Slice hex_encoded_metadata = GetSliceUntil(&data, '\n');
bool decode_success = hex_encoded_metadata.DecodeHex(&app_metadata_);
if (!decode_success) {
return Status::Corruption(
"Failed to decode stored hex encoded app metadata");
}
}
num_files = static_cast<uint32_t>(strtoul(data.data(), &next, 10));
data.remove_prefix(next - data.data() + 1); // +1 for '\n'
std::vector<std::shared_ptr<FileInfo>> files;
// WART: The checksums are crc32c, not original crc32
Slice checksum_prefix("crc32 ");
for (uint32_t i = 0; s.ok() && i < num_files; ++i) {
auto line = GetSliceUntil(&data, '\n');
// filename is relative, i.e., shared/number.sst,
// shared_checksum/number.sst, or private/backup_id/number.sst
std::string filename = GetSliceUntil(&line, ' ').ToString();
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;
try {
size = abs_path_to_size.at(abs_path);
} catch (std::out_of_range&) {
return Status::Corruption("Size missing for pathname: " + abs_path);
}
}
if (line.empty()) {
return Status::Corruption("File checksum is missing for " + filename +
" in " + meta_filename_);
}
uint32_t checksum_value = 0;
std::string checksum_func_name = kUnknownFileChecksumFuncName;
if (line.starts_with(checksum_prefix)) {
line.remove_prefix(checksum_prefix.size());
checksum_func_name = kDefaultBackupFileChecksumFuncName;
checksum_value = static_cast<uint32_t>(strtoul(line.data(), nullptr, 10));
if (line != ROCKSDB_NAMESPACE::ToString(checksum_value)) {
return Status::Corruption("Invalid crc32c checksum value for " +
filename + " in " + meta_filename_);
}
} else {
return Status::Corruption("Unknown checksum type for " + filename +
" in " + meta_filename_);
}
files.emplace_back(
new FileInfo(filename, size, ChecksumInt32ToHex(checksum_value),
"" /* custom_checksum_hex */, checksum_func_name));
}
if (s.ok() && data.size() > 0) {
// file has to be read completely. if not, we count it as corruption
s = Status::Corruption("Tailing data in backup meta file in " +
meta_filename_);
}
if (s.ok()) {
files_.reserve(files.size());
for (const auto& file_info : files) {
s = AddFile(file_info);
if (!s.ok()) {
break;
}
}
}
return s;
}
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::unique_ptr<char[]> buf(new char[max_backup_meta_file_size_]);
size_t len = 0, buf_size = max_backup_meta_file_size_;
len += snprintf(buf.get(), buf_size, "%" PRId64 "\n", timestamp_);
len += snprintf(buf.get() + len, buf_size - len, "%" PRIu64 "\n",
sequence_number_);
if (!app_metadata_.empty()) {
std::string hex_encoded_metadata =
Slice(app_metadata_).ToString(/* hex */ true);
// +1 to accommodate newline character
size_t hex_meta_strlen =
kMetaDataPrefix.ToString().length() + hex_encoded_metadata.length() + 1;
if (hex_meta_strlen >= buf_size) {
return Status::Corruption("Buffer too small to fit backup metadata");
}
else if (len + hex_meta_strlen >= buf_size) {
backup_meta_file->Append(Slice(buf.get(), len));
buf.reset();
std::unique_ptr<char[]> new_reset_buf(
new char[max_backup_meta_file_size_]);
buf.swap(new_reset_buf);
len = 0;
}
len += snprintf(buf.get() + len, buf_size - len, "%s%s\n",
kMetaDataPrefix.ToString().c_str(),
hex_encoded_metadata.c_str());
}
char writelen_temp[19];
if (len + snprintf(writelen_temp, sizeof(writelen_temp),
"%" ROCKSDB_PRIszt "\n", files_.size()) >= buf_size) {
backup_meta_file->Append(Slice(buf.get(), len));
buf.reset();
std::unique_ptr<char[]> new_reset_buf(new char[max_backup_meta_file_size_]);
buf.swap(new_reset_buf);
len = 0;
}
{
const char *const_write = writelen_temp;
len += snprintf(buf.get() + len, buf_size - len, "%s", const_write);
}
for (const auto& file : files_) {
// use crc32c for now, switch to something else if needed
// WART: The checksums are crc32c, not original crc32
size_t newlen =
len + file->filename.length() +
snprintf(writelen_temp, sizeof(writelen_temp), " crc32 %u\n",
ChecksumHexToInt32(file->checksum_hex));
const char* const_write = writelen_temp;
if (newlen >= buf_size) {
backup_meta_file->Append(Slice(buf.get(), len));
buf.reset();
std::unique_ptr<char[]> new_reset_buf(
new char[max_backup_meta_file_size_]);
buf.swap(new_reset_buf);
len = 0;
}
len += snprintf(buf.get() + len, buf_size - len, "%s%s",
file->filename.c_str(), const_write);
}
s = backup_meta_file->Append(Slice(buf.get(), len));
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 {
public:
BackupEngineReadOnlyImpl(const BackupableDBOptions& options, Env* db_env)
: backup_engine_(new BackupEngineImpl(options, db_env, true)) {}
~BackupEngineReadOnlyImpl() override {}
// The returned BackupInfos are in chronological order, which means the
// latest backup comes last.
void GetBackupInfo(std::vector<BackupInfo>* backup_info) override {
backup_engine_->GetBackupInfo(backup_info);
}
void GetCorruptedBackups(std::vector<BackupID>* corrupt_backup_ids) override {
backup_engine_->GetCorruptedBackups(corrupt_backup_ids);
}
using BackupEngineReadOnly::RestoreDBFromBackup;
Status RestoreDBFromBackup(const RestoreOptions& options, BackupID backup_id,
const std::string& db_dir,
const std::string& wal_dir) override {
return backup_engine_->RestoreDBFromBackup(options, backup_id, db_dir,
wal_dir);
}
using BackupEngineReadOnly::RestoreDBFromLatestBackup;
Status RestoreDBFromLatestBackup(const RestoreOptions& options,
const std::string& db_dir,
const std::string& wal_dir) override {
return backup_engine_->RestoreDBFromLatestBackup(options, db_dir, wal_dir);
}
Status VerifyBackup(BackupID backup_id,
bool verify_with_checksum = false) override {
return backup_engine_->VerifyBackup(backup_id, verify_with_checksum);
}
Status Initialize() { return backup_engine_->Initialize(); }
private:
std::unique_ptr<BackupEngineImpl> backup_engine_;
};
Status BackupEngineReadOnly::Open(const BackupableDBOptions& options, Env* env,
BackupEngineReadOnly** backup_engine_ptr) {
if (options.destroy_old_data) {
return Status::InvalidArgument(
"Can't destroy old data with ReadOnly BackupEngine");
}
std::unique_ptr<BackupEngineReadOnlyImpl> backup_engine(
new BackupEngineReadOnlyImpl(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();
}
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE
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