f80050fa8f
Summary: The patch exposes the file numbers of the SSTs as well as the oldest blob files they contain a reference to through the GetColumnFamilyMetaData/ GetLiveFilesMetaData interface. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6011 Test Plan: Fixed and extended the existing unit tests. (The earlier ColumnFamilyMetaDataTest wasn't really testing anything because the generated memtables were never flushed, so the metadata structure was essentially empty.) Differential Revision: D18361697 Pulled By: ltamasi fbshipit-source-id: d5ed1d94ac70858b84393c48711441ddfe1251e9
516 lines
19 KiB
C++
516 lines
19 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2012 Facebook.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef ROCKSDB_LITE
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#include "utilities/checkpoint/checkpoint_impl.h"
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#include <algorithm>
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#include <cinttypes>
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#include <string>
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#include <vector>
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#include "db/wal_manager.h"
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#include "file/file_util.h"
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#include "file/filename.h"
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#include "port/port.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/metadata.h"
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#include "rocksdb/transaction_log.h"
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#include "rocksdb/utilities/checkpoint.h"
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#include "test_util/sync_point.h"
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namespace rocksdb {
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Status Checkpoint::Create(DB* db, Checkpoint** checkpoint_ptr) {
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*checkpoint_ptr = new CheckpointImpl(db);
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return Status::OK();
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}
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Status Checkpoint::CreateCheckpoint(const std::string& /*checkpoint_dir*/,
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uint64_t /*log_size_for_flush*/) {
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return Status::NotSupported("");
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}
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void CheckpointImpl::CleanStagingDirectory(
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const std::string& full_private_path, Logger* info_log) {
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std::vector<std::string> subchildren;
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Status s = db_->GetEnv()->FileExists(full_private_path);
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if (s.IsNotFound()) {
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return;
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}
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ROCKS_LOG_INFO(info_log, "File exists %s -- %s",
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full_private_path.c_str(), s.ToString().c_str());
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db_->GetEnv()->GetChildren(full_private_path, &subchildren);
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for (auto& subchild : subchildren) {
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std::string subchild_path = full_private_path + "/" + subchild;
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s = db_->GetEnv()->DeleteFile(subchild_path);
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ROCKS_LOG_INFO(info_log, "Delete file %s -- %s",
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subchild_path.c_str(), s.ToString().c_str());
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}
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// finally delete the private dir
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s = db_->GetEnv()->DeleteDir(full_private_path);
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ROCKS_LOG_INFO(info_log, "Delete dir %s -- %s",
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full_private_path.c_str(), s.ToString().c_str());
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}
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Status Checkpoint::ExportColumnFamily(
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ColumnFamilyHandle* /*handle*/, const std::string& /*export_dir*/,
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ExportImportFilesMetaData** /*metadata*/) {
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return Status::NotSupported("");
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}
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// Builds an openable snapshot of RocksDB
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Status CheckpointImpl::CreateCheckpoint(const std::string& checkpoint_dir,
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uint64_t log_size_for_flush) {
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DBOptions db_options = db_->GetDBOptions();
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Status s = db_->GetEnv()->FileExists(checkpoint_dir);
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if (s.ok()) {
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return Status::InvalidArgument("Directory exists");
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} else if (!s.IsNotFound()) {
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assert(s.IsIOError());
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return s;
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}
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ROCKS_LOG_INFO(
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db_options.info_log,
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"Started the snapshot process -- creating snapshot in directory %s",
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checkpoint_dir.c_str());
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size_t final_nonslash_idx = checkpoint_dir.find_last_not_of('/');
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if (final_nonslash_idx == std::string::npos) {
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// npos means it's only slashes or empty. Non-empty means it's the root
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// directory, but it shouldn't be because we verified above the directory
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// doesn't exist.
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assert(checkpoint_dir.empty());
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return Status::InvalidArgument("invalid checkpoint directory name");
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}
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std::string full_private_path =
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checkpoint_dir.substr(0, final_nonslash_idx + 1) + ".tmp";
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ROCKS_LOG_INFO(
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db_options.info_log,
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"Snapshot process -- using temporary directory %s",
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full_private_path.c_str());
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CleanStagingDirectory(full_private_path, db_options.info_log.get());
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// create snapshot directory
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s = db_->GetEnv()->CreateDir(full_private_path);
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uint64_t sequence_number = 0;
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if (s.ok()) {
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db_->DisableFileDeletions();
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s = CreateCustomCheckpoint(
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db_options,
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[&](const std::string& src_dirname, const std::string& fname,
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FileType) {
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ROCKS_LOG_INFO(db_options.info_log, "Hard Linking %s", fname.c_str());
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return db_->GetEnv()->LinkFile(src_dirname + fname,
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full_private_path + fname);
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} /* link_file_cb */,
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[&](const std::string& src_dirname, const std::string& fname,
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uint64_t size_limit_bytes, FileType) {
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ROCKS_LOG_INFO(db_options.info_log, "Copying %s", fname.c_str());
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return CopyFile(db_->GetEnv(), src_dirname + fname,
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full_private_path + fname, size_limit_bytes,
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db_options.use_fsync);
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} /* copy_file_cb */,
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[&](const std::string& fname, const std::string& contents, FileType) {
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ROCKS_LOG_INFO(db_options.info_log, "Creating %s", fname.c_str());
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return CreateFile(db_->GetEnv(), full_private_path + fname, contents,
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db_options.use_fsync);
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} /* create_file_cb */,
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&sequence_number, log_size_for_flush);
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// we copied all the files, enable file deletions
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db_->EnableFileDeletions(false);
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}
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if (s.ok()) {
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// move tmp private backup to real snapshot directory
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s = db_->GetEnv()->RenameFile(full_private_path, checkpoint_dir);
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}
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if (s.ok()) {
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std::unique_ptr<Directory> checkpoint_directory;
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db_->GetEnv()->NewDirectory(checkpoint_dir, &checkpoint_directory);
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if (checkpoint_directory != nullptr) {
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s = checkpoint_directory->Fsync();
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}
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}
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if (s.ok()) {
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// here we know that we succeeded and installed the new snapshot
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ROCKS_LOG_INFO(db_options.info_log, "Snapshot DONE. All is good");
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ROCKS_LOG_INFO(db_options.info_log, "Snapshot sequence number: %" PRIu64,
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sequence_number);
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} else {
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// clean all the files we might have created
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ROCKS_LOG_INFO(db_options.info_log, "Snapshot failed -- %s",
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s.ToString().c_str());
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CleanStagingDirectory(full_private_path, db_options.info_log.get());
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}
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return s;
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}
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Status CheckpointImpl::CreateCustomCheckpoint(
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const DBOptions& db_options,
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std::function<Status(const std::string& src_dirname,
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const std::string& src_fname, FileType type)>
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link_file_cb,
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std::function<Status(const std::string& src_dirname,
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const std::string& src_fname,
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uint64_t size_limit_bytes, FileType type)>
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copy_file_cb,
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std::function<Status(const std::string& fname, const std::string& contents,
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FileType type)>
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create_file_cb,
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uint64_t* sequence_number, uint64_t log_size_for_flush) {
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Status s;
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std::vector<std::string> live_files;
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uint64_t manifest_file_size = 0;
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uint64_t min_log_num = port::kMaxUint64;
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*sequence_number = db_->GetLatestSequenceNumber();
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bool same_fs = true;
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VectorLogPtr live_wal_files;
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bool flush_memtable = true;
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if (s.ok()) {
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if (!db_options.allow_2pc) {
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if (log_size_for_flush == port::kMaxUint64) {
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flush_memtable = false;
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} else if (log_size_for_flush > 0) {
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// If out standing log files are small, we skip the flush.
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s = db_->GetSortedWalFiles(live_wal_files);
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if (!s.ok()) {
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return s;
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}
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// Don't flush column families if total log size is smaller than
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// log_size_for_flush. We copy the log files instead.
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// We may be able to cover 2PC case too.
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uint64_t total_wal_size = 0;
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for (auto& wal : live_wal_files) {
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total_wal_size += wal->SizeFileBytes();
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}
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if (total_wal_size < log_size_for_flush) {
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flush_memtable = false;
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}
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live_wal_files.clear();
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}
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}
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// this will return live_files prefixed with "/"
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s = db_->GetLiveFiles(live_files, &manifest_file_size, flush_memtable);
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if (s.ok() && db_options.allow_2pc) {
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// If 2PC is enabled, we need to get minimum log number after the flush.
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// Need to refetch the live files to recapture the snapshot.
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if (!db_->GetIntProperty(DB::Properties::kMinLogNumberToKeep,
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&min_log_num)) {
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return Status::InvalidArgument(
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"2PC enabled but cannot fine the min log number to keep.");
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}
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// We need to refetch live files with flush to handle this case:
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// A previous 000001.log contains the prepare record of transaction tnx1.
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// The current log file is 000002.log, and sequence_number points to this
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// file.
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// After calling GetLiveFiles(), 000003.log is created.
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// Then tnx1 is committed. The commit record is written to 000003.log.
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// Now we fetch min_log_num, which will be 3.
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// Then only 000002.log and 000003.log will be copied, and 000001.log will
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// be skipped. 000003.log contains commit message of tnx1, but we don't
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// have respective prepare record for it.
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// In order to avoid this situation, we need to force flush to make sure
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// all transactions committed before getting min_log_num will be flushed
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// to SST files.
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// We cannot get min_log_num before calling the GetLiveFiles() for the
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// first time, because if we do that, all the logs files will be included,
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// far more than needed.
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s = db_->GetLiveFiles(live_files, &manifest_file_size, flush_memtable);
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}
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TEST_SYNC_POINT("CheckpointImpl::CreateCheckpoint:SavedLiveFiles1");
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TEST_SYNC_POINT("CheckpointImpl::CreateCheckpoint:SavedLiveFiles2");
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db_->FlushWAL(false /* sync */);
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}
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// if we have more than one column family, we need to also get WAL files
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if (s.ok()) {
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s = db_->GetSortedWalFiles(live_wal_files);
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}
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if (!s.ok()) {
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return s;
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}
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size_t wal_size = live_wal_files.size();
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// copy/hard link live_files
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std::string manifest_fname, current_fname;
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for (size_t i = 0; s.ok() && i < live_files.size(); ++i) {
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uint64_t number;
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FileType type;
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bool ok = ParseFileName(live_files[i], &number, &type);
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if (!ok) {
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s = Status::Corruption("Can't parse file name. This is very bad");
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break;
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}
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// we should only get sst, options, manifest and current files here
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assert(type == kTableFile || type == kDescriptorFile ||
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type == kCurrentFile || type == kOptionsFile);
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assert(live_files[i].size() > 0 && live_files[i][0] == '/');
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if (type == kCurrentFile) {
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// We will craft the current file manually to ensure it's consistent with
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// the manifest number. This is necessary because current's file contents
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// can change during checkpoint creation.
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current_fname = live_files[i];
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continue;
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} else if (type == kDescriptorFile) {
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manifest_fname = live_files[i];
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}
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std::string src_fname = live_files[i];
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// rules:
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// * if it's kTableFile, then it's shared
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// * if it's kDescriptorFile, limit the size to manifest_file_size
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// * always copy if cross-device link
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if ((type == kTableFile) && same_fs) {
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s = link_file_cb(db_->GetName(), src_fname, type);
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if (s.IsNotSupported()) {
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same_fs = false;
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s = Status::OK();
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}
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}
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if ((type != kTableFile) || (!same_fs)) {
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s = copy_file_cb(db_->GetName(), src_fname,
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(type == kDescriptorFile) ? manifest_file_size : 0,
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type);
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}
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}
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if (s.ok() && !current_fname.empty() && !manifest_fname.empty()) {
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create_file_cb(current_fname, manifest_fname.substr(1) + "\n",
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kCurrentFile);
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}
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ROCKS_LOG_INFO(db_options.info_log, "Number of log files %" ROCKSDB_PRIszt,
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live_wal_files.size());
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// Link WAL files. Copy exact size of last one because it is the only one
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// that has changes after the last flush.
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for (size_t i = 0; s.ok() && i < wal_size; ++i) {
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if ((live_wal_files[i]->Type() == kAliveLogFile) &&
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(!flush_memtable ||
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live_wal_files[i]->StartSequence() >= *sequence_number ||
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live_wal_files[i]->LogNumber() >= min_log_num)) {
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if (i + 1 == wal_size) {
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s = copy_file_cb(db_options.wal_dir, live_wal_files[i]->PathName(),
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live_wal_files[i]->SizeFileBytes(), kLogFile);
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break;
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}
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if (same_fs) {
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// we only care about live log files
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s = link_file_cb(db_options.wal_dir, live_wal_files[i]->PathName(),
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kLogFile);
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if (s.IsNotSupported()) {
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same_fs = false;
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s = Status::OK();
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}
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}
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if (!same_fs) {
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s = copy_file_cb(db_options.wal_dir, live_wal_files[i]->PathName(), 0,
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kLogFile);
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}
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}
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}
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return s;
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}
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// Exports all live SST files of a specified Column Family onto export_dir,
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// returning SST files information in metadata.
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Status CheckpointImpl::ExportColumnFamily(
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ColumnFamilyHandle* handle, const std::string& export_dir,
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ExportImportFilesMetaData** metadata) {
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auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(handle);
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const auto cf_name = cfh->GetName();
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const auto db_options = db_->GetDBOptions();
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assert(metadata != nullptr);
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assert(*metadata == nullptr);
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auto s = db_->GetEnv()->FileExists(export_dir);
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if (s.ok()) {
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return Status::InvalidArgument("Specified export_dir exists");
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} else if (!s.IsNotFound()) {
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assert(s.IsIOError());
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return s;
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}
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const auto final_nonslash_idx = export_dir.find_last_not_of('/');
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if (final_nonslash_idx == std::string::npos) {
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return Status::InvalidArgument("Specified export_dir invalid");
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}
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ROCKS_LOG_INFO(db_options.info_log,
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"[%s] export column family onto export directory %s",
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cf_name.c_str(), export_dir.c_str());
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// Create a temporary export directory.
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const auto tmp_export_dir =
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export_dir.substr(0, final_nonslash_idx + 1) + ".tmp";
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s = db_->GetEnv()->CreateDir(tmp_export_dir);
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if (s.ok()) {
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s = db_->Flush(rocksdb::FlushOptions(), handle);
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}
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ColumnFamilyMetaData db_metadata;
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if (s.ok()) {
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// Export live sst files with file deletions disabled.
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s = db_->DisableFileDeletions();
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if (s.ok()) {
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db_->GetColumnFamilyMetaData(handle, &db_metadata);
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s = ExportFilesInMetaData(
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db_options, db_metadata,
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[&](const std::string& src_dirname, const std::string& fname) {
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ROCKS_LOG_INFO(db_options.info_log, "[%s] HardLinking %s",
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cf_name.c_str(), fname.c_str());
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return db_->GetEnv()->LinkFile(src_dirname + fname,
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tmp_export_dir + fname);
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} /*link_file_cb*/,
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[&](const std::string& src_dirname, const std::string& fname) {
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ROCKS_LOG_INFO(db_options.info_log, "[%s] Copying %s",
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cf_name.c_str(), fname.c_str());
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return CopyFile(db_->GetEnv(), src_dirname + fname,
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tmp_export_dir + fname, 0, db_options.use_fsync);
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} /*copy_file_cb*/);
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const auto enable_status = db_->EnableFileDeletions(false /*force*/);
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if (s.ok()) {
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s = enable_status;
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}
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}
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}
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auto moved_to_user_specified_dir = false;
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if (s.ok()) {
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// Move temporary export directory to the actual export directory.
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s = db_->GetEnv()->RenameFile(tmp_export_dir, export_dir);
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}
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if (s.ok()) {
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// Fsync export directory.
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moved_to_user_specified_dir = true;
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std::unique_ptr<Directory> dir_ptr;
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s = db_->GetEnv()->NewDirectory(export_dir, &dir_ptr);
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if (s.ok()) {
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assert(dir_ptr != nullptr);
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s = dir_ptr->Fsync();
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}
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}
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if (s.ok()) {
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// Export of files succeeded. Fill in the metadata information.
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auto result_metadata = new ExportImportFilesMetaData();
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result_metadata->db_comparator_name = handle->GetComparator()->Name();
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for (const auto& level_metadata : db_metadata.levels) {
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for (const auto& file_metadata : level_metadata.files) {
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LiveFileMetaData live_file_metadata;
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live_file_metadata.size = file_metadata.size;
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live_file_metadata.name = std::move(file_metadata.name);
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live_file_metadata.file_number = file_metadata.file_number;
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live_file_metadata.db_path = export_dir;
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live_file_metadata.smallest_seqno = file_metadata.smallest_seqno;
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live_file_metadata.largest_seqno = file_metadata.largest_seqno;
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live_file_metadata.smallestkey = std::move(file_metadata.smallestkey);
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live_file_metadata.largestkey = std::move(file_metadata.largestkey);
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live_file_metadata.oldest_blob_file_number =
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file_metadata.oldest_blob_file_number;
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live_file_metadata.level = level_metadata.level;
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result_metadata->files.push_back(live_file_metadata);
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}
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*metadata = result_metadata;
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}
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ROCKS_LOG_INFO(db_options.info_log, "[%s] Export succeeded.",
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cf_name.c_str());
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} else {
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// Failure: Clean up all the files/directories created.
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ROCKS_LOG_INFO(db_options.info_log, "[%s] Export failed. %s",
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cf_name.c_str(), s.ToString().c_str());
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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
|
|
|
|
#endif // ROCKSDB_LITE
|