rocksdb/utilities/checkpoint/checkpoint.cc
Islam AbdelRahman e19163688b Add macros to include file name and line number during Logging
Summary:
current logging
```
2017/03/14-14:20:30.393432 7fedde9f5700 (Original Log Time 2017/03/14-14:20:30.393414) [default] Level summary: base level 1 max bytes base 268435456 files[1 0 0 0 0 0 0] max score 0.25
2017/03/14-14:20:30.393438 7fedde9f5700 [JOB 2] Try to delete WAL files size 61417909, prev total WAL file size 73820858, number of live WAL files 2.
2017/03/14-14:20:30.393464 7fedde9f5700 [DEBUG] [JOB 2] Delete /dev/shm/old_logging//MANIFEST-000001 type=3 #1 -- OK
2017/03/14-14:20:30.393472 7fedde9f5700 [DEBUG] [JOB 2] Delete /dev/shm/old_logging//000003.log type=0 #3 -- OK
2017/03/14-14:20:31.427103 7fedd49f1700 [default] New memtable created with log file: #9. Immutable memtables: 0.
2017/03/14-14:20:31.427179 7fedde9f5700 [JOB 3] Syncing log #6
2017/03/14-14:20:31.427190 7fedde9f5700 (Original Log Time 2017/03/14-14:20:31.427170) Calling FlushMemTableToOutputFile with column family [default], flush slots available 1, compaction slots allowed 1, compaction slots scheduled 1
2017/03/14-14:20:31.
Closes https://github.com/facebook/rocksdb/pull/1990

Differential Revision: D4708695

Pulled By: IslamAbdelRahman

fbshipit-source-id: cb8968f
2017-03-15 19:39:12 -07:00

271 lines
10 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same 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 "rocksdb/utilities/checkpoint.h"
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <algorithm>
#include <string>
#include "db/filename.h"
#include "db/wal_manager.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/transaction_log.h"
#include "util/file_util.h"
#include "util/sync_point.h"
#include "port/port.h"
namespace rocksdb {
class CheckpointImpl : public Checkpoint {
public:
// Creates a Checkpoint object to be used for creating openable snapshots
explicit CheckpointImpl(DB* db) : db_(db) {}
// Builds an openable snapshot of RocksDB on the same disk, which
// accepts an output directory on the same disk, and under the directory
// (1) hard-linked SST files pointing to existing live SST files
// SST files will be copied if output directory is on a different filesystem
// (2) a copied manifest files and other files
// The directory should not already exist and will be created by this API.
// The directory will be an absolute path
using Checkpoint::CreateCheckpoint;
virtual Status CreateCheckpoint(const std::string& checkpoint_dir) override;
private:
DB* db_;
};
Status Checkpoint::Create(DB* db, Checkpoint** checkpoint_ptr) {
*checkpoint_ptr = new CheckpointImpl(db);
return Status::OK();
}
Status Checkpoint::CreateCheckpoint(const std::string& checkpoint_dir) {
return Status::NotSupported("");
}
// Builds an openable snapshot of RocksDB
Status CheckpointImpl::CreateCheckpoint(const std::string& checkpoint_dir) {
Status s;
std::vector<std::string> live_files;
uint64_t manifest_file_size = 0;
DBOptions db_options = db_->GetDBOptions();
uint64_t min_log_num = port::kMaxUint64;
uint64_t sequence_number = db_->GetLatestSequenceNumber();
bool same_fs = true;
VectorLogPtr live_wal_files;
s = db_->GetEnv()->FileExists(checkpoint_dir);
if (s.ok()) {
return Status::InvalidArgument("Directory exists");
} else if (!s.IsNotFound()) {
assert(s.IsIOError());
return s;
}
s = db_->DisableFileDeletions();
if (s.ok()) {
// this will return live_files prefixed with "/"
s = db_->GetLiveFiles(live_files, &manifest_file_size);
if (s.ok() && db_options.allow_2pc) {
// If 2PC is enabled, we need to get minimum log number after the flush.
// Need to refetch the live files to recapture the snapshot.
if (!db_->GetIntProperty(DB::Properties::kMinLogNumberToKeep,
&min_log_num)) {
db_->EnableFileDeletions(false);
return Status::InvalidArgument(
"2PC enabled but cannot fine the min log number to keep.");
}
// We need to refetch live files with flush to handle this case:
// A previous 000001.log contains the prepare record of transaction tnx1.
// The current log file is 000002.log, and sequence_number points to this
// file.
// After calling GetLiveFiles(), 000003.log is created.
// Then tnx1 is committed. The commit record is written to 000003.log.
// Now we fetch min_log_num, which will be 3.
// Then only 000002.log and 000003.log will be copied, and 000001.log will
// be skipped. 000003.log contains commit message of tnx1, but we don't
// have respective prepare record for it.
// In order to avoid this situation, we need to force flush to make sure
// all transactions commited before getting min_log_num will be flushed
// to SST files.
// We cannot get min_log_num before calling the GetLiveFiles() for the
// first time, because if we do that, all the logs files will be included,
// far more than needed.
s = db_->GetLiveFiles(live_files, &manifest_file_size, /* flush */ true);
}
TEST_SYNC_POINT("CheckpointImpl::CreateCheckpoint:SavedLiveFiles1");
TEST_SYNC_POINT("CheckpointImpl::CreateCheckpoint:SavedLiveFiles2");
}
// if we have more than one column family, we need to also get WAL files
if (s.ok()) {
s = db_->GetSortedWalFiles(live_wal_files);
}
if (!s.ok()) {
db_->EnableFileDeletions(false);
return s;
}
size_t wal_size = live_wal_files.size();
ROCKS_LOG_INFO(
db_options.info_log,
"Started the snapshot process -- creating snapshot in directory %s",
checkpoint_dir.c_str());
std::string full_private_path = checkpoint_dir + ".tmp";
// create snapshot directory
s = db_->GetEnv()->CreateDir(full_private_path);
// copy/hard link live_files
std::string manifest_fname, current_fname;
for (size_t i = 0; s.ok() && i < live_files.size(); ++i) {
uint64_t number;
FileType type;
bool ok = ParseFileName(live_files[i], &number, &type);
if (!ok) {
s = Status::Corruption("Can't parse file name. This is very bad");
break;
}
// we should only get sst, options, manifest and current files here
assert(type == kTableFile || type == kDescriptorFile ||
type == kCurrentFile || type == kOptionsFile);
assert(live_files[i].size() > 0 && live_files[i][0] == '/');
if (type == kCurrentFile) {
// We will craft the current file manually to ensure it's consistent with
// the manifest number. This is necessary because current's file contents
// can change during checkpoint creation.
current_fname = live_files[i];
continue;
} else if (type == kDescriptorFile) {
manifest_fname = live_files[i];
}
std::string src_fname = live_files[i];
// rules:
// * if it's kTableFile, then it's shared
// * if it's kDescriptorFile, limit the size to manifest_file_size
// * always copy if cross-device link
if ((type == kTableFile) && same_fs) {
ROCKS_LOG_INFO(db_options.info_log, "Hard Linking %s", src_fname.c_str());
s = db_->GetEnv()->LinkFile(db_->GetName() + src_fname,
full_private_path + src_fname);
if (s.IsNotSupported()) {
same_fs = false;
s = Status::OK();
}
}
if ((type != kTableFile) || (!same_fs)) {
ROCKS_LOG_INFO(db_options.info_log, "Copying %s", src_fname.c_str());
s = CopyFile(db_->GetEnv(), db_->GetName() + src_fname,
full_private_path + src_fname,
(type == kDescriptorFile) ? manifest_file_size : 0,
db_options.use_fsync);
}
}
if (s.ok() && !current_fname.empty() && !manifest_fname.empty()) {
s = CreateFile(db_->GetEnv(), full_private_path + current_fname,
manifest_fname.substr(1) + "\n");
}
ROCKS_LOG_INFO(db_options.info_log, "Number of log files %" ROCKSDB_PRIszt,
live_wal_files.size());
// Link WAL files. Copy exact size of last one because it is the only one
// that has changes after the last flush.
for (size_t i = 0; s.ok() && i < wal_size; ++i) {
if ((live_wal_files[i]->Type() == kAliveLogFile) &&
(live_wal_files[i]->StartSequence() >= sequence_number ||
live_wal_files[i]->LogNumber() >= min_log_num)) {
if (i + 1 == wal_size) {
ROCKS_LOG_INFO(db_options.info_log, "Copying %s",
live_wal_files[i]->PathName().c_str());
s = CopyFile(db_->GetEnv(),
db_options.wal_dir + live_wal_files[i]->PathName(),
full_private_path + live_wal_files[i]->PathName(),
live_wal_files[i]->SizeFileBytes(), db_options.use_fsync);
break;
}
if (same_fs) {
// we only care about live log files
ROCKS_LOG_INFO(db_options.info_log, "Hard Linking %s",
live_wal_files[i]->PathName().c_str());
s = db_->GetEnv()->LinkFile(
db_options.wal_dir + live_wal_files[i]->PathName(),
full_private_path + live_wal_files[i]->PathName());
if (s.IsNotSupported()) {
same_fs = false;
s = Status::OK();
}
}
if (!same_fs) {
ROCKS_LOG_INFO(db_options.info_log, "Copying %s",
live_wal_files[i]->PathName().c_str());
s = CopyFile(db_->GetEnv(),
db_options.wal_dir + live_wal_files[i]->PathName(),
full_private_path + live_wal_files[i]->PathName(), 0,
db_options.use_fsync);
}
}
}
// we copied all the files, enable file deletions
db_->EnableFileDeletions(false);
if (s.ok()) {
// move tmp private backup to real snapshot directory
s = db_->GetEnv()->RenameFile(full_private_path, checkpoint_dir);
}
if (s.ok()) {
unique_ptr<Directory> checkpoint_directory;
db_->GetEnv()->NewDirectory(checkpoint_dir, &checkpoint_directory);
if (checkpoint_directory != nullptr) {
s = checkpoint_directory->Fsync();
}
}
if (!s.ok()) {
// clean all the files we might have created
ROCKS_LOG_INFO(db_options.info_log, "Snapshot failed -- %s",
s.ToString().c_str());
// we have to delete the dir and all its children
std::vector<std::string> subchildren;
db_->GetEnv()->GetChildren(full_private_path, &subchildren);
for (auto& subchild : subchildren) {
std::string subchild_path = full_private_path + "/" + subchild;
Status s1 = db_->GetEnv()->DeleteFile(subchild_path);
ROCKS_LOG_INFO(db_options.info_log, "Delete file %s -- %s",
subchild_path.c_str(), s1.ToString().c_str());
}
// finally delete the private dir
Status s1 = db_->GetEnv()->DeleteDir(full_private_path);
ROCKS_LOG_INFO(db_options.info_log, "Delete dir %s -- %s",
full_private_path.c_str(), s1.ToString().c_str());
return s;
}
// 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);
return s;
}
} // namespace rocksdb
#endif // ROCKSDB_LITE