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rocksdb/db/db_filesnapshot.cc

163 lines
5.2 KiB

// 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).
//
#ifndef ROCKSDB_LITE
#include <stdint.h>
#include <algorithm>
#include <cinttypes>
#include <string>
#include "db/db_impl/db_impl.h"
#include "db/job_context.h"
#include "db/version_set.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 "test_util/sync_point.h"
#include "util/mutexlock.h"
namespace ROCKSDB_NAMESPACE {
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;
if (immutable_db_options_.atomic_flush) {
autovector<ColumnFamilyData*> cfds;
SelectColumnFamiliesForAtomicFlush(&cfds);
mutex_.Unlock();
status = AtomicFlushMemTables(cfds, FlushOptions(),
FlushReason::kGetLiveFiles);
if (status.IsColumnFamilyDropped()) {
status = Status::OK();
}
mutex_.Lock();
} else {
for (auto cfd : *versions_->GetColumnFamilySet()) {
if (cfd->IsDropped()) {
continue;
}
cfd->Ref();
mutex_.Unlock();
status = FlushMemTable(cfd, FlushOptions(), FlushReason::kGetLiveFiles);
TEST_SYNC_POINT("DBImpl::GetLiveFiles:1");
TEST_SYNC_POINT("DBImpl::GetLiveFiles:2");
mutex_.Lock();
cfd->UnrefAndTryDelete();
if (!status.ok() && !status.IsColumnFamilyDropped()) {
break;
} else if (status.IsColumnFamilyDropped()) {
status = Status::OK();
}
}
}
versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
if (!status.ok()) {
mutex_.Unlock();
ROCKS_LOG_ERROR(immutable_db_options_.info_log, "Cannot Flush data %s\n",
status.ToString().c_str());
return status;
}
}
// Make a set of all of the live table and blob files
std::vector<uint64_t> live_table_files;
std::vector<uint64_t> live_blob_files;
for (auto cfd : *versions_->GetColumnFamilySet()) {
if (cfd->IsDropped()) {
continue;
}
cfd->current()->AddLiveFiles(&live_table_files, &live_blob_files);
}
ret.clear();
ret.reserve(live_table_files.size() + live_blob_files.size() +
3); // for CURRENT + MANIFEST + OPTIONS
// create names of the live files. The names are not absolute
// paths, instead they are relative to dbname_;
for (const auto& table_file_number : live_table_files) {
ret.emplace_back(MakeTableFileName("", table_file_number));
}
for (const auto& blob_file_number : live_blob_files) {
ret.emplace_back(BlobFileName("", blob_file_number));
}
ret.emplace_back(CurrentFileName(""));
ret.emplace_back(DescriptorFileName("", versions_->manifest_file_number()));
// The OPTIONS file number is zero in read-write mode when OPTIONS file
// writing failed and the DB was configured with
// `fail_if_options_file_error == false`. In read-only mode the OPTIONS file
// number is zero when no OPTIONS file exist at all. In those cases we do not
// record any OPTIONS file in the live file list.
if (versions_->options_file_number() != 0) {
ret.emplace_back(OptionsFileName("", versions_->options_file_number()));
}
// find length of manifest file while holding the mutex lock
*manifest_file_size = versions_->manifest_file_size();
mutex_.Unlock();
return Status::OK();
}
Status DBImpl::GetSortedWalFiles(VectorLogPtr& files) {
{
// If caller disabled deletions, this function should return files that are
// guaranteed not to be deleted until deletions are re-enabled. We need to
// wait for pending purges to finish since WalManager doesn't know which
// files are going to be purged. Additional purges won't be scheduled as
// long as deletions are disabled (so the below loop must terminate).
InstrumentedMutexLock l(&mutex_);
while (disable_delete_obsolete_files_ > 0 &&
(pending_purge_obsolete_files_ > 0 || bg_purge_scheduled_ > 0)) {
bg_cv_.Wait();
}
}
// Disable deletion in order to avoid the case where a file is deleted in
// the middle of the process so IO error is returned.
Status s = DisableFileDeletions();
bool file_deletion_supported = !s.IsNotSupported();
if (s.ok() || !file_deletion_supported) {
s = wal_manager_.GetSortedWalFiles(files);
if (file_deletion_supported) {
Status s2 = EnableFileDeletions(false);
if (!s2.ok() && s.ok()) {
s = s2;
}
}
}
return s;
}
Status DBImpl::GetCurrentWalFile(std::unique_ptr<LogFile>* current_log_file) {
uint64_t current_logfile_number;
{
InstrumentedMutexLock l(&mutex_);
current_logfile_number = logfile_number_;
}
return wal_manager_.GetLiveWalFile(current_logfile_number, current_log_file);
}
} // namespace ROCKSDB_NAMESPACE
#endif // ROCKSDB_LITE