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rocksdb/utilities/checkpoint/checkpoint_impl.cc

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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) 2012 Facebook.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ROCKSDB_LITE
#include "utilities/checkpoint/checkpoint_impl.h"
#include <algorithm>
#include <cinttypes>
#include <string>
#include <tuple>
#include <unordered_set>
#include <vector>
#include "db/wal_manager.h"
#include "file/file_util.h"
#include "file/filename.h"
#include "logging/logging.h"
#include "port/port.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/metadata.h"
#include "rocksdb/options.h"
#include "rocksdb/transaction_log.h"
#include "rocksdb/types.h"
#include "rocksdb/utilities/checkpoint.h"
#include "test_util/sync_point.h"
#include "util/cast_util.h"
#include "util/file_checksum_helper.h"
namespace ROCKSDB_NAMESPACE {
Status Checkpoint::Create(DB* db, Checkpoint** checkpoint_ptr) {
*checkpoint_ptr = new CheckpointImpl(db);
return Status::OK();
}
Status Checkpoint::CreateCheckpoint(const std::string& /*checkpoint_dir*/,
uint64_t /*log_size_for_flush*/,
uint64_t* /*sequence_number_ptr*/) {
return Status::NotSupported("");
}
void CheckpointImpl::CleanStagingDirectory(const std::string& full_private_path,
Logger* info_log) {
std::vector<std::string> subchildren;
Status s = db_->GetEnv()->FileExists(full_private_path);
if (s.IsNotFound()) {
return;
}
ROCKS_LOG_INFO(info_log, "File exists %s -- %s", full_private_path.c_str(),
s.ToString().c_str());
s = db_->GetEnv()->GetChildren(full_private_path, &subchildren);
if (s.ok()) {
for (auto& subchild : subchildren) {
std::string subchild_path = full_private_path + "/" + subchild;
s = db_->GetEnv()->DeleteFile(subchild_path);
ROCKS_LOG_INFO(info_log, "Delete file %s -- %s", subchild_path.c_str(),
s.ToString().c_str());
}
}
// finally delete the private dir
s = db_->GetEnv()->DeleteDir(full_private_path);
ROCKS_LOG_INFO(info_log, "Delete dir %s -- %s", full_private_path.c_str(),
s.ToString().c_str());
}
Status Checkpoint::ExportColumnFamily(
ColumnFamilyHandle* /*handle*/, const std::string& /*export_dir*/,
ExportImportFilesMetaData** /*metadata*/) {
return Status::NotSupported("");
}
// Builds an openable snapshot of RocksDB
Status CheckpointImpl::CreateCheckpoint(const std::string& checkpoint_dir,
uint64_t log_size_for_flush,
uint64_t* sequence_number_ptr) {
DBOptions db_options = db_->GetDBOptions();
Status s = db_->GetEnv()->FileExists(checkpoint_dir);
if (s.ok()) {
return Status::InvalidArgument("Directory exists");
} else if (!s.IsNotFound()) {
assert(s.IsIOError());
return s;
}
ROCKS_LOG_INFO(
db_options.info_log,
"Started the snapshot process -- creating snapshot in directory %s",
checkpoint_dir.c_str());
size_t final_nonslash_idx = checkpoint_dir.find_last_not_of('/');
if (final_nonslash_idx == std::string::npos) {
// npos means it's only slashes or empty. Non-empty means it's the root
// directory, but it shouldn't be because we verified above the directory
// doesn't exist.
assert(checkpoint_dir.empty());
return Status::InvalidArgument("invalid checkpoint directory name");
}
std::string full_private_path =
checkpoint_dir.substr(0, final_nonslash_idx + 1) + ".tmp";
ROCKS_LOG_INFO(db_options.info_log,
"Snapshot process -- using temporary directory %s",
full_private_path.c_str());
CleanStagingDirectory(full_private_path, db_options.info_log.get());
// create snapshot directory
s = db_->GetEnv()->CreateDir(full_private_path);
uint64_t sequence_number = 0;
if (s.ok()) {
// enable file deletions
s = db_->DisableFileDeletions();
const bool disabled_file_deletions = s.ok();
if (s.ok() || s.IsNotSupported()) {
s = CreateCustomCheckpoint(
[&](const std::string& src_dirname, const std::string& fname,
FileType) {
ROCKS_LOG_INFO(db_options.info_log, "Hard Linking %s",
fname.c_str());
return db_->GetFileSystem()->LinkFile(
src_dirname + "/" + fname, full_private_path + "/" + fname,
IOOptions(), nullptr);
} /* link_file_cb */,
[&](const std::string& src_dirname, const std::string& fname,
uint64_t size_limit_bytes, FileType,
const std::string& /* checksum_func_name */,
const std::string& /* checksum_val */) {
ROCKS_LOG_INFO(db_options.info_log, "Copying %s", fname.c_str());
return CopyFile(db_->GetFileSystem(), src_dirname + "/" + fname,
full_private_path + "/" + fname, size_limit_bytes,
db_options.use_fsync);
} /* copy_file_cb */,
[&](const std::string& fname, const std::string& contents, FileType) {
ROCKS_LOG_INFO(db_options.info_log, "Creating %s", fname.c_str());
return CreateFile(db_->GetFileSystem(),
full_private_path + "/" + fname, contents,
db_options.use_fsync);
} /* create_file_cb */,
&sequence_number, log_size_for_flush);
// we copied all the files, enable file deletions
if (disabled_file_deletions) {
Status ss = db_->EnableFileDeletions(false);
assert(ss.ok());
ss.PermitUncheckedError();
}
}
}
if (s.ok()) {
// move tmp private backup to real snapshot directory
s = db_->GetEnv()->RenameFile(full_private_path, checkpoint_dir);
}
if (s.ok()) {
std::unique_ptr<Directory> checkpoint_directory;
s = db_->GetEnv()->NewDirectory(checkpoint_dir, &checkpoint_directory);
if (s.ok() && checkpoint_directory != nullptr) {
s = checkpoint_directory->Fsync();
}
}
if (s.ok()) {
if (sequence_number_ptr != nullptr) {
*sequence_number_ptr = sequence_number;
}
// here we know that we succeeded and installed the new snapshot
ROCKS_LOG_INFO(db_options.info_log, "Snapshot DONE. All is good");
ROCKS_LOG_INFO(db_options.info_log, "Snapshot sequence number: %" PRIu64,
sequence_number);
} else {
// clean all the files we might have created
ROCKS_LOG_INFO(db_options.info_log, "Snapshot failed -- %s",
s.ToString().c_str());
CleanStagingDirectory(full_private_path, db_options.info_log.get());
}
return s;
}
Status CheckpointImpl::CreateCustomCheckpoint(
std::function<Status(const std::string& src_dirname,
const std::string& src_fname, FileType type)>
link_file_cb,
std::function<Status(
const std::string& src_dirname, const std::string& src_fname,
uint64_t size_limit_bytes, FileType type,
const std::string& checksum_func_name, const std::string& checksum_val)>
copy_file_cb,
std::function<Status(const std::string& fname, const std::string& contents,
FileType type)>
create_file_cb,
uint64_t* sequence_number, uint64_t log_size_for_flush,
bool get_live_table_checksum) {
*sequence_number = db_->GetLatestSequenceNumber();
LiveFilesStorageInfoOptions opts;
opts.include_checksum_info = get_live_table_checksum;
opts.wal_size_for_flush = log_size_for_flush;
std::vector<LiveFileStorageInfo> infos;
{
Status s = db_->GetLiveFilesStorageInfo(opts, &infos);
if (!s.ok()) {
return s;
}
}
// Verify that everything except WAL files are in same directory
// (db_paths / cf_paths not supported)
std::unordered_set<std::string> dirs;
for (auto& info : infos) {
if (info.file_type != kWalFile) {
dirs.insert(info.directory);
}
}
if (dirs.size() > 1) {
return Status::NotSupported(
"db_paths / cf_paths not supported for Checkpoint nor BackupEngine");
}
bool same_fs = true;
for (auto& info : infos) {
Status s;
if (!info.replacement_contents.empty()) {
// Currently should only be used for CURRENT file.
assert(info.file_type == kCurrentFile);
if (info.size != info.replacement_contents.size()) {
s = Status::Corruption("Inconsistent size metadata for " +
info.relative_filename);
} else {
s = create_file_cb(info.relative_filename, info.replacement_contents,
info.file_type);
}
} else {
if (same_fs && !info.trim_to_size) {
s = link_file_cb(info.directory, info.relative_filename,
info.file_type);
if (s.IsNotSupported()) {
same_fs = false;
s = Status::OK();
}
s.MustCheck();
}
if (!same_fs || info.trim_to_size) {
assert(info.file_checksum_func_name.empty() ==
!opts.include_checksum_info);
// no assertion on file_checksum because empty is used for both "not
// set" and "unknown"
if (opts.include_checksum_info) {
s = copy_file_cb(info.directory, info.relative_filename, info.size,
info.file_type, info.file_checksum_func_name,
info.file_checksum);
} else {
s = copy_file_cb(info.directory, info.relative_filename, info.size,
info.file_type, kUnknownFileChecksumFuncName,
kUnknownFileChecksum);
}
}
}
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
// Exports all live SST files of a specified Column Family onto export_dir,
// returning SST files information in metadata.
Status CheckpointImpl::ExportColumnFamily(
ColumnFamilyHandle* handle, const std::string& export_dir,
ExportImportFilesMetaData** metadata) {
auto cfh = static_cast_with_check<ColumnFamilyHandleImpl>(handle);
const auto cf_name = cfh->GetName();
const auto db_options = db_->GetDBOptions();
assert(metadata != nullptr);
assert(*metadata == nullptr);
auto s = db_->GetEnv()->FileExists(export_dir);
if (s.ok()) {
return Status::InvalidArgument("Specified export_dir exists");
} else if (!s.IsNotFound()) {
assert(s.IsIOError());
return s;
}
const auto final_nonslash_idx = export_dir.find_last_not_of('/');
if (final_nonslash_idx == std::string::npos) {
return Status::InvalidArgument("Specified export_dir invalid");
}
ROCKS_LOG_INFO(db_options.info_log,
"[%s] export column family onto export directory %s",
cf_name.c_str(), export_dir.c_str());
// Create a temporary export directory.
const auto tmp_export_dir =
export_dir.substr(0, final_nonslash_idx + 1) + ".tmp";
s = db_->GetEnv()->CreateDir(tmp_export_dir);
if (s.ok()) {
s = db_->Flush(ROCKSDB_NAMESPACE::FlushOptions(), handle);
}
ColumnFamilyMetaData db_metadata;
if (s.ok()) {
// Export live sst files with file deletions disabled.
s = db_->DisableFileDeletions();
if (s.ok()) {
db_->GetColumnFamilyMetaData(handle, &db_metadata);
s = ExportFilesInMetaData(
db_options, db_metadata,
[&](const std::string& src_dirname, const std::string& fname) {
ROCKS_LOG_INFO(db_options.info_log, "[%s] HardLinking %s",
cf_name.c_str(), fname.c_str());
return db_->GetEnv()->LinkFile(src_dirname + fname,
tmp_export_dir + fname);
} /*link_file_cb*/,
[&](const std::string& src_dirname, const std::string& fname) {
ROCKS_LOG_INFO(db_options.info_log, "[%s] Copying %s",
cf_name.c_str(), fname.c_str());
return CopyFile(db_->GetFileSystem(), src_dirname + fname,
tmp_export_dir + fname, 0, db_options.use_fsync);
} /*copy_file_cb*/);
const auto enable_status = db_->EnableFileDeletions(false /*force*/);
if (s.ok()) {
s = enable_status;
}
}
}
auto moved_to_user_specified_dir = false;
if (s.ok()) {
// Move temporary export directory to the actual export directory.
s = db_->GetEnv()->RenameFile(tmp_export_dir, export_dir);
}
if (s.ok()) {
// Fsync export directory.
moved_to_user_specified_dir = true;
std::unique_ptr<Directory> dir_ptr;
s = db_->GetEnv()->NewDirectory(export_dir, &dir_ptr);
if (s.ok()) {
assert(dir_ptr != nullptr);
s = dir_ptr->Fsync();
}
}
if (s.ok()) {
// Export of files succeeded. Fill in the metadata information.
auto result_metadata = new ExportImportFilesMetaData();
result_metadata->db_comparator_name = handle->GetComparator()->Name();
for (const auto& level_metadata : db_metadata.levels) {
for (const auto& file_metadata : level_metadata.files) {
LiveFileMetaData live_file_metadata;
live_file_metadata.size = file_metadata.size;
live_file_metadata.name = std::move(file_metadata.name);
live_file_metadata.file_number = file_metadata.file_number;
live_file_metadata.db_path = export_dir;
live_file_metadata.smallest_seqno = file_metadata.smallest_seqno;
live_file_metadata.largest_seqno = file_metadata.largest_seqno;
live_file_metadata.smallestkey = std::move(file_metadata.smallestkey);
live_file_metadata.largestkey = std::move(file_metadata.largestkey);
live_file_metadata.oldest_blob_file_number =
file_metadata.oldest_blob_file_number;
live_file_metadata.level = level_metadata.level;
result_metadata->files.push_back(live_file_metadata);
}
*metadata = result_metadata;
}
ROCKS_LOG_INFO(db_options.info_log, "[%s] Export succeeded.",
cf_name.c_str());
} else {
// Failure: Clean up all the files/directories created.
ROCKS_LOG_INFO(db_options.info_log, "[%s] Export failed. %s",
cf_name.c_str(), s.ToString().c_str());
std::vector<std::string> subchildren;
const auto cleanup_dir =
moved_to_user_specified_dir ? export_dir : tmp_export_dir;
db_->GetEnv()->GetChildren(cleanup_dir, &subchildren);
for (const auto& subchild : subchildren) {
const auto subchild_path = cleanup_dir + "/" + subchild;
const auto status = db_->GetEnv()->DeleteFile(subchild_path);
if (!status.ok()) {
ROCKS_LOG_WARN(db_options.info_log, "Failed to cleanup file %s: %s",
subchild_path.c_str(), status.ToString().c_str());
}
}
const auto status = db_->GetEnv()->DeleteDir(cleanup_dir);
if (!status.ok()) {
ROCKS_LOG_WARN(db_options.info_log, "Failed to cleanup dir %s: %s",
cleanup_dir.c_str(), status.ToString().c_str());
}
}
return s;
}
Status CheckpointImpl::ExportFilesInMetaData(
const DBOptions& db_options, const ColumnFamilyMetaData& metadata,
std::function<Status(const std::string& src_dirname,
const std::string& src_fname)>
link_file_cb,
std::function<Status(const std::string& src_dirname,
const std::string& src_fname)>
copy_file_cb) {
Status s;
auto hardlink_file = true;
// Copy/hard link files in metadata.
size_t num_files = 0;
for (const auto& level_metadata : metadata.levels) {
for (const auto& file_metadata : level_metadata.files) {
uint64_t number;
FileType type;
const auto ok = ParseFileName(file_metadata.name, &number, &type);
if (!ok) {
s = Status::Corruption("Could not parse file name");
break;
}
// We should only get sst files here.
assert(type == kTableFile);
assert(file_metadata.size > 0 && file_metadata.name[0] == '/');
const auto src_fname = file_metadata.name;
++num_files;
if (hardlink_file) {
s = link_file_cb(db_->GetName(), src_fname);
if (num_files == 1 && s.IsNotSupported()) {
// Fallback to copy if link failed due to cross-device directories.
hardlink_file = false;
s = Status::OK();
}
}
if (!hardlink_file) {
s = copy_file_cb(db_->GetName(), src_fname);
}
if (!s.ok()) {
break;
}
}
}
ROCKS_LOG_INFO(db_options.info_log, "Number of table files %" ROCKSDB_PRIszt,
num_files);
return s;
}
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE