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rocksdb/db/version_edit_handler.cc
Yanqin Jin eee0af9af1 Add full_history_ts_low to column family (#7740) 
Summary:
Following https://github.com/facebook/rocksdb/issues/7655 and https://github.com/facebook/rocksdb/issues/7657, this PR adds `full_history_ts_low_` to `ColumnFamilyData`.
`ColumnFamilyData::full_history_ts_low_` will be used to create `FlushJob` and `CompactionJob`.

`ColumnFamilyData::full_history_ts_low` is persisted to the MANIFEST file. An application can only
increase its value. Consider the following case:

>
> The database has a key at ts=950. `full_history_ts_low` is first set to 1000, and then a GC is triggered
> and cleans up all data older than 1000. If the application sets `full_history_ts_low` to 900 afterwards,
> and tries to read at ts=960, the key at 950 is not seen. From the perspective of the read, the result
> is hard to reason. For simplicity, we just do now allow decreasing full_history_ts_low for now.
>

During recovery, the value of `full_history_ts_low` is restored for each column family if applicable. Note that
version edits in the MANIFEST file for the same column family may have `full_history_ts_low` unsorted due
to the potential interleaving of `LogAndApply` calls. Only the max will be used to restore the state of the
column family.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7740

Test Plan: make check

Reviewed By: ltamasi

Differential Revision: D25296217

Pulled By: riversand963

fbshipit-source-id: 24acda1df8262cd7cfdc6ce7b0ec56438abe242a
2020-12-05 14:18:22 -08:00

694 lines
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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) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "db/version_edit_handler.h"
#include <cinttypes>
#include "monitoring/persistent_stats_history.h"
namespace ROCKSDB_NAMESPACE {
void VersionEditHandlerBase::Iterate(log::Reader& reader,
Status* log_read_status) {
Slice record;
std::string scratch;
assert(log_read_status);
assert(log_read_status->ok());
size_t recovered_edits = 0;
Status s = Initialize();
while (reader.LastRecordEnd() < max_manifest_read_size_ && s.ok() &&
reader.ReadRecord(&record, &scratch) && log_read_status->ok()) {
VersionEdit edit;
s = edit.DecodeFrom(record);
if (!s.ok()) {
break;
}
s = read_buffer_.AddEdit(&edit);
if (!s.ok()) {
break;
}
ColumnFamilyData* cfd = nullptr;
if (edit.is_in_atomic_group_) {
if (read_buffer_.IsFull()) {
for (auto& e : read_buffer_.replay_buffer()) {
s = ApplyVersionEdit(e, &cfd);
if (!s.ok()) {
break;
}
++recovered_edits;
}
if (!s.ok()) {
break;
}
read_buffer_.Clear();
}
} else {
s = ApplyVersionEdit(edit, &cfd);
if (s.ok()) {
++recovered_edits;
}
}
}
if (!log_read_status->ok()) {
s = *log_read_status;
}
read_buffer_.Clear();
CheckIterationResult(reader, &s);
if (!s.ok()) {
status_ = s;
}
TEST_SYNC_POINT_CALLBACK("VersionEditHandlerBase::Iterate:Finish",
&recovered_edits);
}
Status ListColumnFamiliesHandler::ApplyVersionEdit(
VersionEdit& edit, ColumnFamilyData** /*unused*/) {
Status s;
if (edit.is_column_family_add_) {
if (column_family_names_.find(edit.column_family_) !=
column_family_names_.end()) {
s = Status::Corruption("Manifest adding the same column family twice");
} else {
column_family_names_.insert(
{edit.column_family_, edit.column_family_name_});
}
} else if (edit.is_column_family_drop_) {
if (column_family_names_.find(edit.column_family_) ==
column_family_names_.end()) {
s = Status::Corruption("Manifest - dropping non-existing column family");
} else {
column_family_names_.erase(edit.column_family_);
}
}
return s;
}
Status FileChecksumRetriever::ApplyVersionEdit(VersionEdit& edit,
ColumnFamilyData** /*unused*/) {
for (const auto& deleted_file : edit.GetDeletedFiles()) {
file_checksum_list_.RemoveOneFileChecksum(deleted_file.second);
}
for (const auto& new_file : edit.GetNewFiles()) {
file_checksum_list_.InsertOneFileChecksum(
new_file.second.fd.GetNumber(), new_file.second.file_checksum,
new_file.second.file_checksum_func_name);
}
return Status::OK();
}
VersionEditHandler::VersionEditHandler(
bool read_only, const std::vector<ColumnFamilyDescriptor>& column_families,
VersionSet* version_set, bool track_missing_files,
bool no_error_if_table_files_missing,
const std::shared_ptr<IOTracer>& io_tracer, bool skip_load_table_files)
: VersionEditHandlerBase(),
read_only_(read_only),
column_families_(column_families),
version_set_(version_set),
track_missing_files_(track_missing_files),
no_error_if_table_files_missing_(no_error_if_table_files_missing),
io_tracer_(io_tracer),
skip_load_table_files_(skip_load_table_files),
initialized_(false) {
assert(version_set_ != nullptr);
}
Status VersionEditHandler::Initialize() {
Status s;
if (!initialized_) {
for (const auto& cf_desc : column_families_) {
name_to_options_.emplace(cf_desc.name, cf_desc.options);
}
auto default_cf_iter = name_to_options_.find(kDefaultColumnFamilyName);
if (default_cf_iter == name_to_options_.end()) {
s = Status::InvalidArgument("Default column family not specified");
}
if (s.ok()) {
VersionEdit default_cf_edit;
default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName);
default_cf_edit.SetColumnFamily(0);
ColumnFamilyData* cfd =
CreateCfAndInit(default_cf_iter->second, default_cf_edit);
assert(cfd != nullptr);
#ifdef NDEBUG
(void)cfd;
#endif
initialized_ = true;
}
}
return s;
}
Status VersionEditHandler::ApplyVersionEdit(VersionEdit& edit,
ColumnFamilyData** cfd) {
Status s;
if (edit.is_column_family_add_) {
s = OnColumnFamilyAdd(edit, cfd);
} else if (edit.is_column_family_drop_) {
s = OnColumnFamilyDrop(edit, cfd);
} else if (edit.IsWalAddition()) {
s = OnWalAddition(edit);
} else if (edit.IsWalDeletion()) {
s = OnWalDeletion(edit);
} else {
s = OnNonCfOperation(edit, cfd);
}
if (s.ok()) {
assert(cfd != nullptr);
s = ExtractInfoFromVersionEdit(*cfd, edit);
}
return s;
}
Status VersionEditHandler::OnColumnFamilyAdd(VersionEdit& edit,
ColumnFamilyData** cfd) {
bool cf_in_not_found = false;
bool cf_in_builders = false;
CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders);
assert(cfd != nullptr);
*cfd = nullptr;
Status s;
if (cf_in_builders || cf_in_not_found) {
s = Status::Corruption("MANIFEST adding the same column family twice: " +
edit.column_family_name_);
}
if (s.ok()) {
auto cf_options = name_to_options_.find(edit.column_family_name_);
// implicitly add persistent_stats column family without requiring user
// to specify
ColumnFamilyData* tmp_cfd = nullptr;
bool is_persistent_stats_column_family =
edit.column_family_name_.compare(kPersistentStatsColumnFamilyName) == 0;
if (cf_options == name_to_options_.end() &&
!is_persistent_stats_column_family) {
column_families_not_found_.emplace(edit.column_family_,
edit.column_family_name_);
} else {
if (is_persistent_stats_column_family) {
ColumnFamilyOptions cfo;
OptimizeForPersistentStats(&cfo);
tmp_cfd = CreateCfAndInit(cfo, edit);
} else {
tmp_cfd = CreateCfAndInit(cf_options->second, edit);
}
*cfd = tmp_cfd;
}
}
return s;
}
Status VersionEditHandler::OnColumnFamilyDrop(VersionEdit& edit,
ColumnFamilyData** cfd) {
bool cf_in_not_found = false;
bool cf_in_builders = false;
CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders);
assert(cfd != nullptr);
*cfd = nullptr;
ColumnFamilyData* tmp_cfd = nullptr;
Status s;
if (cf_in_builders) {
tmp_cfd = DestroyCfAndCleanup(edit);
} else if (cf_in_not_found) {
column_families_not_found_.erase(edit.column_family_);
} else {
s = Status::Corruption("MANIFEST - dropping non-existing column family");
}
*cfd = tmp_cfd;
return s;
}
Status VersionEditHandler::OnWalAddition(VersionEdit& edit) {
assert(edit.IsWalAddition());
return version_set_->wals_.AddWals(edit.GetWalAdditions());
}
Status VersionEditHandler::OnWalDeletion(VersionEdit& edit) {
assert(edit.IsWalDeletion());
return version_set_->wals_.DeleteWalsBefore(
edit.GetWalDeletion().GetLogNumber());
}
Status VersionEditHandler::OnNonCfOperation(VersionEdit& edit,
ColumnFamilyData** cfd) {
bool cf_in_not_found = false;
bool cf_in_builders = false;
CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders);
assert(cfd != nullptr);
*cfd = nullptr;
Status s;
if (!cf_in_not_found) {
if (!cf_in_builders) {
s = Status::Corruption(
"MANIFEST record referencing unknown column family");
}
ColumnFamilyData* tmp_cfd = nullptr;
if (s.ok()) {
auto builder_iter = builders_.find(edit.column_family_);
assert(builder_iter != builders_.end());
tmp_cfd = version_set_->GetColumnFamilySet()->GetColumnFamily(
edit.column_family_);
assert(tmp_cfd != nullptr);
s = MaybeCreateVersion(edit, tmp_cfd, /*force_create_version=*/false);
if (s.ok()) {
s = builder_iter->second->version_builder()->Apply(&edit);
}
}
*cfd = tmp_cfd;
}
return s;
}
// TODO maybe cache the computation result
bool VersionEditHandler::HasMissingFiles() const {
bool ret = false;
for (const auto& elem : cf_to_missing_files_) {
const auto& missing_files = elem.second;
if (!missing_files.empty()) {
ret = true;
break;
}
}
return ret;
}
void VersionEditHandler::CheckColumnFamilyId(const VersionEdit& edit,
bool* cf_in_not_found,
bool* cf_in_builders) const {
assert(cf_in_not_found != nullptr);
assert(cf_in_builders != nullptr);
// Not found means that user didn't supply that column
// family option AND we encountered column family add
// record. Once we encounter column family drop record,
// we will delete the column family from
// column_families_not_found.
bool in_not_found = column_families_not_found_.find(edit.column_family_) !=
column_families_not_found_.end();
// in builders means that user supplied that column family
// option AND that we encountered column family add record
bool in_builders = builders_.find(edit.column_family_) != builders_.end();
// They cannot both be true
assert(!(in_not_found && in_builders));
*cf_in_not_found = in_not_found;
*cf_in_builders = in_builders;
}
void VersionEditHandler::CheckIterationResult(const log::Reader& reader,
Status* s) {
assert(s != nullptr);
if (!s->ok()) {
// Do nothing here.
} else if (!version_edit_params_.has_log_number_ ||
!version_edit_params_.has_next_file_number_ ||
!version_edit_params_.has_last_sequence_) {
std::string msg("no ");
if (!version_edit_params_.has_log_number_) {
msg.append("log_file_number, ");
}
if (!version_edit_params_.has_next_file_number_) {
msg.append("next_file_number, ");
}
if (!version_edit_params_.has_last_sequence_) {
msg.append("last_sequence, ");
}
msg = msg.substr(0, msg.size() - 2);
msg.append(" entry in MANIFEST");
*s = Status::Corruption(msg);
}
// There were some column families in the MANIFEST that weren't specified
// in the argument. This is OK in read_only mode
if (s->ok() && !read_only_ && !column_families_not_found_.empty()) {
std::string msg;
for (const auto& cf : column_families_not_found_) {
msg.append(", ");
msg.append(cf.second);
}
msg = msg.substr(2);
*s = Status::InvalidArgument("Column families not opened: " + msg);
}
if (s->ok()) {
version_set_->GetColumnFamilySet()->UpdateMaxColumnFamily(
version_edit_params_.max_column_family_);
version_set_->MarkMinLogNumberToKeep2PC(
version_edit_params_.min_log_number_to_keep_);
version_set_->MarkFileNumberUsed(version_edit_params_.prev_log_number_);
version_set_->MarkFileNumberUsed(version_edit_params_.log_number_);
for (auto* cfd : *(version_set_->GetColumnFamilySet())) {
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
auto* builder = builder_iter->second->version_builder();
if (!builder->CheckConsistencyForNumLevels()) {
*s = Status::InvalidArgument(
"db has more levels than options.num_levels");
break;
}
}
}
if (s->ok()) {
for (auto* cfd : *(version_set_->GetColumnFamilySet())) {
if (cfd->IsDropped()) {
continue;
}
if (read_only_) {
cfd->table_cache()->SetTablesAreImmortal();
}
*s = LoadTables(cfd, /*prefetch_index_and_filter_in_cache=*/false,
/*is_initial_load=*/true);
if (!s->ok()) {
// If s is IOError::PathNotFound, then we mark the db as corrupted.
if (s->IsPathNotFound()) {
*s = Status::Corruption("Corruption: " + s->ToString());
}
break;
}
}
}
if (s->ok()) {
for (auto* cfd : *(version_set_->column_family_set_)) {
if (cfd->IsDropped()) {
continue;
}
assert(cfd->initialized());
VersionEdit edit;
*s = MaybeCreateVersion(edit, cfd, /*force_create_version=*/true);
if (!s->ok()) {
break;
}
}
}
if (s->ok()) {
version_set_->manifest_file_size_ = reader.GetReadOffset();
assert(version_set_->manifest_file_size_ > 0);
version_set_->next_file_number_.store(
version_edit_params_.next_file_number_ + 1);
version_set_->last_allocated_sequence_ =
version_edit_params_.last_sequence_;
version_set_->last_published_sequence_ =
version_edit_params_.last_sequence_;
version_set_->last_sequence_ = version_edit_params_.last_sequence_;
version_set_->prev_log_number_ = version_edit_params_.prev_log_number_;
}
}
ColumnFamilyData* VersionEditHandler::CreateCfAndInit(
const ColumnFamilyOptions& cf_options, const VersionEdit& edit) {
ColumnFamilyData* cfd = version_set_->CreateColumnFamily(cf_options, &edit);
assert(cfd != nullptr);
cfd->set_initialized();
assert(builders_.find(edit.column_family_) == builders_.end());
builders_.emplace(edit.column_family_,
VersionBuilderUPtr(new BaseReferencedVersionBuilder(cfd)));
if (track_missing_files_) {
cf_to_missing_files_.emplace(edit.column_family_,
std::unordered_set<uint64_t>());
}
return cfd;
}
ColumnFamilyData* VersionEditHandler::DestroyCfAndCleanup(
const VersionEdit& edit) {
auto builder_iter = builders_.find(edit.column_family_);
assert(builder_iter != builders_.end());
builders_.erase(builder_iter);
if (track_missing_files_) {
auto missing_files_iter = cf_to_missing_files_.find(edit.column_family_);
assert(missing_files_iter != cf_to_missing_files_.end());
cf_to_missing_files_.erase(missing_files_iter);
}
ColumnFamilyData* ret =
version_set_->GetColumnFamilySet()->GetColumnFamily(edit.column_family_);
assert(ret != nullptr);
if (ret->UnrefAndTryDelete()) {
ret = nullptr;
} else {
assert(false);
}
return ret;
}
Status VersionEditHandler::MaybeCreateVersion(const VersionEdit& /*edit*/,
ColumnFamilyData* cfd,
bool force_create_version) {
assert(cfd->initialized());
Status s;
if (force_create_version) {
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
auto* builder = builder_iter->second->version_builder();
auto* v = new Version(cfd, version_set_, version_set_->file_options_,
*cfd->GetLatestMutableCFOptions(), io_tracer_,
version_set_->current_version_number_++);
s = builder->SaveTo(v->storage_info());
if (s.ok()) {
// Install new version
v->PrepareApply(
*cfd->GetLatestMutableCFOptions(),
!(version_set_->db_options_->skip_stats_update_on_db_open));
version_set_->AppendVersion(cfd, v);
} else {
delete v;
}
}
return s;
}
Status VersionEditHandler::LoadTables(ColumnFamilyData* cfd,
bool prefetch_index_and_filter_in_cache,
bool is_initial_load) {
if (skip_load_table_files_) {
return Status::OK();
}
assert(cfd != nullptr);
assert(!cfd->IsDropped());
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
assert(builder_iter->second != nullptr);
VersionBuilder* builder = builder_iter->second->version_builder();
assert(builder);
Status s = builder->LoadTableHandlers(
cfd->internal_stats(),
version_set_->db_options_->max_file_opening_threads,
prefetch_index_and_filter_in_cache, is_initial_load,
cfd->GetLatestMutableCFOptions()->prefix_extractor.get(),
MaxFileSizeForL0MetaPin(*cfd->GetLatestMutableCFOptions()));
if ((s.IsPathNotFound() || s.IsCorruption()) &&
no_error_if_table_files_missing_) {
s = Status::OK();
}
if (!s.ok() && !version_set_->db_options_->paranoid_checks) {
s = Status::OK();
}
return s;
}
Status VersionEditHandler::ExtractInfoFromVersionEdit(ColumnFamilyData* cfd,
const VersionEdit& edit) {
Status s;
if (edit.has_db_id_) {
version_set_->db_id_ = edit.GetDbId();
version_edit_params_.SetDBId(edit.db_id_);
}
if (cfd != nullptr) {
if (edit.has_log_number_) {
if (cfd->GetLogNumber() > edit.log_number_) {
ROCKS_LOG_WARN(
version_set_->db_options()->info_log,
"MANIFEST corruption detected, but ignored - Log numbers in "
"records NOT monotonically increasing");
} else {
cfd->SetLogNumber(edit.log_number_);
version_edit_params_.SetLogNumber(edit.log_number_);
}
}
if (edit.has_comparator_ &&
edit.comparator_ != cfd->user_comparator()->Name()) {
s = Status::InvalidArgument(
cfd->user_comparator()->Name(),
"does not match existing comparator " + edit.comparator_);
}
if (edit.HasFullHistoryTsLow()) {
const std::string& new_ts = edit.GetFullHistoryTsLow();
cfd->SetFullHistoryTsLow(new_ts);
}
}
if (s.ok()) {
if (edit.has_prev_log_number_) {
version_edit_params_.SetPrevLogNumber(edit.prev_log_number_);
}
if (edit.has_next_file_number_) {
version_edit_params_.SetNextFile(edit.next_file_number_);
}
if (edit.has_max_column_family_) {
version_edit_params_.SetMaxColumnFamily(edit.max_column_family_);
}
if (edit.has_min_log_number_to_keep_) {
version_edit_params_.min_log_number_to_keep_ =
std::max(version_edit_params_.min_log_number_to_keep_,
edit.min_log_number_to_keep_);
}
if (edit.has_last_sequence_) {
version_edit_params_.SetLastSequence(edit.last_sequence_);
}
if (!version_edit_params_.has_prev_log_number_) {
version_edit_params_.SetPrevLogNumber(0);
}
}
return s;
}
VersionEditHandlerPointInTime::VersionEditHandlerPointInTime(
bool read_only, const std::vector<ColumnFamilyDescriptor>& column_families,
VersionSet* version_set, const std::shared_ptr<IOTracer>& io_tracer)
: VersionEditHandler(read_only, column_families, version_set,
/*track_missing_files=*/true,
/*no_error_if_table_files_missing=*/true, io_tracer) {}
VersionEditHandlerPointInTime::~VersionEditHandlerPointInTime() {
for (const auto& elem : versions_) {
delete elem.second;
}
versions_.clear();
}
void VersionEditHandlerPointInTime::CheckIterationResult(
const log::Reader& reader, Status* s) {
VersionEditHandler::CheckIterationResult(reader, s);
assert(s != nullptr);
if (s->ok()) {
for (auto* cfd : *(version_set_->column_family_set_)) {
if (cfd->IsDropped()) {
continue;
}
assert(cfd->initialized());
auto v_iter = versions_.find(cfd->GetID());
if (v_iter != versions_.end()) {
assert(v_iter->second != nullptr);
version_set_->AppendVersion(cfd, v_iter->second);
versions_.erase(v_iter);
}
}
}
}
ColumnFamilyData* VersionEditHandlerPointInTime::DestroyCfAndCleanup(
const VersionEdit& edit) {
ColumnFamilyData* cfd = VersionEditHandler::DestroyCfAndCleanup(edit);
auto v_iter = versions_.find(edit.column_family_);
if (v_iter != versions_.end()) {
delete v_iter->second;
versions_.erase(v_iter);
}
return cfd;
}
Status VersionEditHandlerPointInTime::MaybeCreateVersion(
const VersionEdit& edit, ColumnFamilyData* cfd, bool force_create_version) {
assert(cfd != nullptr);
if (!force_create_version) {
assert(edit.column_family_ == cfd->GetID());
}
auto missing_files_iter = cf_to_missing_files_.find(cfd->GetID());
assert(missing_files_iter != cf_to_missing_files_.end());
std::unordered_set<uint64_t>& missing_files = missing_files_iter->second;
const bool prev_has_missing_files = !missing_files.empty();
for (const auto& file : edit.GetDeletedFiles()) {
uint64_t file_num = file.second;
auto fiter = missing_files.find(file_num);
if (fiter != missing_files.end()) {
missing_files.erase(fiter);
}
}
Status s;
for (const auto& elem : edit.GetNewFiles()) {
const FileMetaData& meta = elem.second;
const FileDescriptor& fd = meta.fd;
uint64_t file_num = fd.GetNumber();
const std::string fpath =
MakeTableFileName(cfd->ioptions()->cf_paths[0].path, file_num);
s = version_set_->VerifyFileMetadata(fpath, meta);
if (s.IsPathNotFound() || s.IsNotFound() || s.IsCorruption()) {
missing_files.insert(file_num);
s = Status::OK();
} else if (!s.ok()) {
break;
}
}
bool missing_info = !version_edit_params_.has_log_number_ ||
!version_edit_params_.has_next_file_number_ ||
!version_edit_params_.has_last_sequence_;
// Create version before apply edit
if (s.ok() && !missing_info &&
((!missing_files.empty() && !prev_has_missing_files) ||
(missing_files.empty() && force_create_version))) {
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
auto* builder = builder_iter->second->version_builder();
auto* version = new Version(cfd, version_set_, version_set_->file_options_,
*cfd->GetLatestMutableCFOptions(), io_tracer_,
version_set_->current_version_number_++);
s = builder->SaveTo(version->storage_info());
if (s.ok()) {
version->PrepareApply(
*cfd->GetLatestMutableCFOptions(),
!version_set_->db_options_->skip_stats_update_on_db_open);
auto v_iter = versions_.find(cfd->GetID());
if (v_iter != versions_.end()) {
delete v_iter->second;
v_iter->second = version;
} else {
versions_.emplace(cfd->GetID(), version);
}
} else {
delete version;
}
}
return s;
}
void DumpManifestHandler::CheckIterationResult(const log::Reader& reader,
Status* s) {
VersionEditHandler::CheckIterationResult(reader, s);
if (!s->ok()) {
fprintf(stdout, "%s\n", s->ToString().c_str());
return;
}
for (auto* cfd : *(version_set_->column_family_set_)) {
fprintf(stdout,
"--------------- Column family \"%s\" (ID %" PRIu32
") --------------\n",
cfd->GetName().c_str(), cfd->GetID());
fprintf(stdout, "log number: %" PRIu64 "\n", cfd->GetLogNumber());
fprintf(stdout, "comparator: %s\n", cfd->user_comparator()->Name());
assert(cfd->current());
fprintf(stdout, "%s \n", cfd->current()->DebugString(hex_).c_str());
}
fprintf(stdout,
"next_file_number %" PRIu64 " last_sequence %" PRIu64
" prev_log_number %" PRIu64 " max_column_family %" PRIu32
" min_log_number_to_keep "
"%" PRIu64 "\n",
version_set_->current_next_file_number(),
version_set_->LastSequence(), version_set_->prev_log_number(),
version_set_->column_family_set_->GetMaxColumnFamily(),
version_set_->min_log_number_to_keep_2pc());
}
} // namespace ROCKSDB_NAMESPACE
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