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rocksdb/db/db_filesnapshot.cc

186 lines
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// Copyright (c) 2013, 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
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
#include <algorithm>
#include <string>
#include <stdint.h>
#include "db/db_impl.h"
#include "db/filename.h"
#include "db/version_set.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "port/port.h"
#include "util/mutexlock.h"
#include "util/sync_point.h"
namespace rocksdb {
Status DBImpl::DisableFileDeletions() {
MutexLock l(&mutex_);
++disable_delete_obsolete_files_;
if (disable_delete_obsolete_files_ == 1) {
Log(options_.info_log, "File Deletions Disabled");
} else {
Log(options_.info_log,
"File Deletions Disabled, but already disabled. Counter: %d",
disable_delete_obsolete_files_);
}
return Status::OK();
}
Status DBImpl::EnableFileDeletions(bool force) {
DeletionState deletion_state;
bool should_purge_files = false;
{
MutexLock l(&mutex_);
if (force) {
// if force, we need to enable file deletions right away
disable_delete_obsolete_files_ = 0;
} else if (disable_delete_obsolete_files_ > 0) {
--disable_delete_obsolete_files_;
}
if (disable_delete_obsolete_files_ == 0) {
Log(options_.info_log, "File Deletions Enabled");
should_purge_files = true;
FindObsoleteFiles(deletion_state, true);
} else {
Log(options_.info_log,
"File Deletions Enable, but not really enabled. Counter: %d",
disable_delete_obsolete_files_);
}
}
if (should_purge_files) {
PurgeObsoleteFiles(deletion_state);
}
LogFlush(options_.info_log);
return Status::OK();
}
int DBImpl::IsFileDeletionsEnabled() const {
return disable_delete_obsolete_files_;
}
Status DBImpl::GetLiveFiles(std::vector<std::string>& ret,
uint64_t* manifest_file_size,
bool flush_memtable) {
*manifest_file_size = 0;
mutex_.Lock();
if (flush_memtable) {
// flush all dirty data to disk.
Status status;
for (auto cfd : *versions_->GetColumnFamilySet()) {
cfd->Ref();
mutex_.Unlock();
status = FlushMemTable(cfd, FlushOptions());
mutex_.Lock();
cfd->Unref();
if (!status.ok()) {
break;
}
}
versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
if (!status.ok()) {
mutex_.Unlock();
Log(options_.info_log, "Cannot Flush data %s\n",
status.ToString().c_str());
return status;
}
}
// Make a set of all of the live *.sst files
std::vector<FileDescriptor> live;
for (auto cfd : *versions_->GetColumnFamilySet()) {
cfd->current()->AddLiveFiles(&live);
}
ret.clear();
ret.reserve(live.size() + 2); //*.sst + CURRENT + MANIFEST
// create names of the live files. The names are not absolute
// paths, instead they are relative to dbname_;
for (auto live_file : live) {
ret.push_back(MakeTableFileName("", live_file.GetNumber()));
}
ret.push_back(CurrentFileName(""));
ret.push_back(DescriptorFileName("", versions_->ManifestFileNumber()));
// find length of manifest file while holding the mutex lock
*manifest_file_size = versions_->ManifestFileSize();
mutex_.Unlock();
return Status::OK();
}
Status DBImpl::GetSortedWalFiles(VectorLogPtr& files) {
// First get sorted files in db dir, then get sorted files from archived
// dir, to avoid a race condition where a log file is moved to archived
// dir in between.
Status s;
// list wal files in main db dir.
VectorLogPtr logs;
s = GetSortedWalsOfType(options_.wal_dir, logs, kAliveLogFile);
if (!s.ok()) {
return s;
}
// Reproduce the race condition where a log file is moved
// to archived dir, between these two sync points, used in
// (DBTest,TransactionLogIteratorRace)
TEST_SYNC_POINT("DBImpl::GetSortedWalFiles:1");
TEST_SYNC_POINT("DBImpl::GetSortedWalFiles:2");
files.clear();
// list wal files in archive dir.
std::string archivedir = ArchivalDirectory(options_.wal_dir);
if (env_->FileExists(archivedir)) {
s = GetSortedWalsOfType(archivedir, files, kArchivedLogFile);
if (!s.ok()) {
return s;
}
}
uint64_t latest_archived_log_number = 0;
if (!files.empty()) {
latest_archived_log_number = files.back()->LogNumber();
Log(options_.info_log, "Latest Archived log: %" PRIu64,
latest_archived_log_number);
}
files.reserve(files.size() + logs.size());
for (auto& log : logs) {
if (log->LogNumber() > latest_archived_log_number) {
files.push_back(std::move(log));
} else {
// When the race condition happens, we could see the
// same log in both db dir and archived dir. Simply
// ignore the one in db dir. Note that, if we read
// archived dir first, we would have missed the log file.
Log(options_.info_log, "%s already moved to archive",
log->PathName().c_str());
}
}
return s;
}
}
#endif // ROCKSDB_LITE