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rocksdb/db/version_edit_handler.cc
Baptiste Lemaire c521a9ab2b Retire superfluous functions introduced in earlier mempurge PRs. (#8558) 
Summary:
The main challenge to make the memtable garbage collection prototype (nicknamed `mempurge`) was to not get rid of WAL files that contain unflushed (but mempurged) data. That was successfully guaranteed by not writing the VersionEdit to the MANIFEST file after a successful mempurge.
By not writing VersionEdits to the `MANIFEST` file after a succesful mempurge operation, we do not change the earliest log file number that contains unflushed data: `cfd->GetLogNumber()` (`cfd->SetLogNumber()` is only called in `VersionSet::ProcessManifestWrites`). As a result, a number of functions introduced earlier just for the mempurge operation are not obscolete/redundant. (e.g.: `FlushJob::ExtractEarliestLogFileNumber`), and this PR aims at cleaning up all these now-unnecessary functions. In particular, we no longer need to store the earliest log file number in the `MemTable` struct itself. This PR therefore also reverts the `MemTable` struct to its original form.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8558

Test Plan: Already included in `db_flush_test.cc`.

Reviewed By: anand1976

Differential Revision: D29764351

Pulled By: bjlemaire

fbshipit-source-id: 0f43b260fa270251862512f397d3f24ee62e8437
2021-07-22 18:29:13 -07:00

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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 "db/blob/blob_file_cache.h"
#include "db/blob/blob_file_reader.h"
#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;
}
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()) {
Status s = file_checksum_list_.RemoveOneFileChecksum(deleted_file.second);
if (!s.ok()) {
return s;
}
}
for (const auto& new_file : edit.GetNewFiles()) {
Status s = file_checksum_list_.InsertOneFileChecksum(
new_file.second.fd.GetNumber(), new_file.second.file_checksum,
new_file.second.file_checksum_func_name);
if (!s.ok()) {
return s;
}
}
for (const auto& new_blob_file : edit.GetBlobFileAdditions()) {
std::string checksum_value = new_blob_file.GetChecksumValue();
std::string checksum_method = new_blob_file.GetChecksumMethod();
assert(checksum_value.empty() == checksum_method.empty());
if (checksum_method.empty()) {
checksum_value = kUnknownFileChecksum;
checksum_method = kUnknownFileChecksumFuncName;
}
Status s = file_checksum_list_.InsertOneFileChecksum(
new_blob_file.GetBlobFileNumber(), checksum_value, checksum_method);
if (!s.ok()) {
return s;
}
}
return Status::OK();
}
VersionEditHandler::VersionEditHandler(
bool read_only, std::vector<ColumnFamilyDescriptor> column_families,
VersionSet* version_set, bool track_missing_files,
bool no_error_if_files_missing, const std::shared_ptr<IOTracer>& io_tracer,
bool skip_load_table_files)
: VersionEditHandlerBase(),
read_only_(read_only),
column_families_(std::move(column_families)),
version_set_(version_set),
track_missing_files_(track_missing_files),
no_error_if_files_missing_(no_error_if_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;
}
}
if (!ret) {
for (const auto& elem : cf_to_missing_blob_files_high_) {
if (elem.second != kInvalidBlobFileNumber) {
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() && MustOpenAllColumnFamilies() &&
!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())) {
if (cfd->IsDropped()) {
continue;
}
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>());
cf_to_missing_blob_files_high_.emplace(edit.column_family_,
kInvalidBlobFileNumber);
}
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);
auto missing_blob_files_high_iter =
cf_to_missing_blob_files_high_.find(edit.column_family_);
assert(missing_blob_files_high_iter !=
cf_to_missing_blob_files_high_.end());
cf_to_missing_blob_files_high_.erase(missing_blob_files_high_iter);
}
ColumnFamilyData* ret =
version_set_->GetColumnFamilySet()->GetColumnFamily(edit.column_family_);
assert(ret != nullptr);
ret->SetDropped();
ret->UnrefAndTryDelete();
ret = nullptr;
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_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()) {
if (!cf_to_cmp_names_) {
s = Status::InvalidArgument(
cfd->user_comparator()->Name(),
"does not match existing comparator " + edit.comparator_);
} else {
cf_to_cmp_names_->emplace(cfd->GetID(), 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, 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_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;
auto missing_blob_files_high_iter =
cf_to_missing_blob_files_high_.find(cfd->GetID());
assert(missing_blob_files_high_iter != cf_to_missing_blob_files_high_.end());
const uint64_t prev_missing_blob_file_high =
missing_blob_files_high_iter->second;
VersionBuilder* builder = nullptr;
if (prev_missing_blob_file_high != kInvalidBlobFileNumber) {
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
builder = builder_iter->second->version_builder();
assert(builder != nullptr);
}
// At this point, we have not yet applied the new version edits read from the
// MANIFEST. We check whether we have any missing table and blob files.
const bool prev_has_missing_files =
!missing_files.empty() ||
(prev_missing_blob_file_high != kInvalidBlobFileNumber &&
prev_missing_blob_file_high >= builder->GetMinOldestBlobFileNumber());
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);
}
}
assert(!cfd->ioptions()->cf_paths.empty());
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 = VerifyFile(fpath, meta);
if (s.IsPathNotFound() || s.IsNotFound() || s.IsCorruption()) {
missing_files.insert(file_num);
s = Status::OK();
} else if (!s.ok()) {
break;
}
}
uint64_t missing_blob_file_num = prev_missing_blob_file_high;
for (const auto& elem : edit.GetBlobFileAdditions()) {
uint64_t file_num = elem.GetBlobFileNumber();
s = VerifyBlobFile(cfd, file_num, elem);
if (s.IsPathNotFound() || s.IsNotFound() || s.IsCorruption()) {
missing_blob_file_num = std::max(missing_blob_file_num, file_num);
s = Status::OK();
} else if (!s.ok()) {
break;
}
}
bool has_missing_blob_files = false;
if (missing_blob_file_num != kInvalidBlobFileNumber &&
missing_blob_file_num >= prev_missing_blob_file_high) {
missing_blob_files_high_iter->second = missing_blob_file_num;
has_missing_blob_files = true;
} else if (missing_blob_file_num < prev_missing_blob_file_high) {
assert(false);
}
// We still have not applied the new version edit, but have tried to add new
// table and blob files after verifying their presence and consistency.
// Therefore, we know whether we will see new missing table and blob files
// later after actually applying the version edit. We perform the check here
// and record the result.
const bool has_missing_files =
!missing_files.empty() || has_missing_blob_files;
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. The version will represent the state
// before applying the version edit.
// A new version will created if:
// 1) no error has occurred so far, and
// 2) log_number_, next_file_number_ and last_sequence_ are known, and
// 3) any of the following:
// a) no missing file before, but will have missing file(s) after applying
// this version edit.
// b) no missing file after applying the version edit, and the caller
// explicitly request that a new version be created.
if (s.ok() && !missing_info &&
((has_missing_files && !prev_has_missing_files) ||
(!has_missing_files && force_create_version))) {
if (!builder) {
auto builder_iter = builders_.find(cfd->GetID());
assert(builder_iter != builders_.end());
builder = builder_iter->second->version_builder();
assert(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;
}
Status VersionEditHandlerPointInTime::VerifyFile(const std::string& fpath,
const FileMetaData& fmeta) {
return version_set_->VerifyFileMetadata(fpath, fmeta);
}
Status VersionEditHandlerPointInTime::VerifyBlobFile(
ColumnFamilyData* cfd, uint64_t blob_file_num,
const BlobFileAddition& blob_addition) {
BlobFileCache* blob_file_cache = cfd->blob_file_cache();
assert(blob_file_cache);
CacheHandleGuard<BlobFileReader> blob_file_reader;
Status s =
blob_file_cache->GetBlobFileReader(blob_file_num, &blob_file_reader);
if (!s.ok()) {
return s;
}
// TODO: verify checksum
(void)blob_addition;
return s;
}
Status ManifestTailer::Initialize() {
if (Mode::kRecovery == mode_) {
return VersionEditHandler::Initialize();
}
assert(Mode::kCatchUp == mode_);
Status s;
if (!initialized_) {
ColumnFamilySet* cfd_set = version_set_->GetColumnFamilySet();
assert(cfd_set);
ColumnFamilyData* default_cfd = cfd_set->GetDefault();
assert(default_cfd);
auto builder_iter = builders_.find(default_cfd->GetID());
assert(builder_iter != builders_.end());
Version* dummy_version = default_cfd->dummy_versions();
assert(dummy_version);
Version* base_version = dummy_version->Next();
assert(base_version);
base_version->Ref();
VersionBuilderUPtr new_builder(
new BaseReferencedVersionBuilder(default_cfd, base_version));
builder_iter->second = std::move(new_builder);
initialized_ = true;
}
return s;
}
Status ManifestTailer::ApplyVersionEdit(VersionEdit& edit,
ColumnFamilyData** cfd) {
Status s = VersionEditHandler::ApplyVersionEdit(edit, cfd);
if (s.ok()) {
assert(cfd);
if (*cfd) {
cfds_changed_.insert(*cfd);
}
}
return s;
}
Status ManifestTailer::OnColumnFamilyAdd(VersionEdit& edit,
ColumnFamilyData** cfd) {
if (Mode::kRecovery == mode_) {
return VersionEditHandler::OnColumnFamilyAdd(edit, cfd);
}
assert(Mode::kCatchUp == mode_);
ColumnFamilySet* cfd_set = version_set_->GetColumnFamilySet();
assert(cfd_set);
ColumnFamilyData* tmp_cfd = cfd_set->GetColumnFamily(edit.GetColumnFamily());
assert(cfd);
*cfd = tmp_cfd;
if (!tmp_cfd) {
// For now, ignore new column families created after Recover() succeeds.
return Status::OK();
}
auto builder_iter = builders_.find(edit.GetColumnFamily());
assert(builder_iter != builders_.end());
Version* dummy_version = tmp_cfd->dummy_versions();
assert(dummy_version);
Version* base_version = dummy_version->Next();
assert(base_version);
base_version->Ref();
VersionBuilderUPtr new_builder(
new BaseReferencedVersionBuilder(tmp_cfd, base_version));
builder_iter->second = std::move(new_builder);
#ifndef NDEBUG
auto version_iter = versions_.find(edit.GetColumnFamily());
assert(version_iter != versions_.end());
#endif // !NDEBUG
return Status::OK();
}
void ManifestTailer::CheckIterationResult(const log::Reader& reader,
Status* s) {
VersionEditHandlerPointInTime::CheckIterationResult(reader, s);
assert(s);
if (s->ok()) {
if (Mode::kRecovery == mode_) {
mode_ = Mode::kCatchUp;
} else {
assert(Mode::kCatchUp == mode_);
}
}
}
Status ManifestTailer::VerifyFile(const std::string& fpath,
const FileMetaData& fmeta) {
Status s = VersionEditHandlerPointInTime::VerifyFile(fpath, fmeta);
// TODO: Open file or create hard link to prevent the file from being
// deleted.
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;
}
assert(cf_to_cmp_names_);
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());
auto it = cf_to_cmp_names_->find(cfd->GetID());
if (it != cf_to_cmp_names_->end()) {
fprintf(stdout,
"comparator: <%s>, but the comparator object is not available.\n",
it->second.c_str());
} else {
fprintf(stdout, "comparator: %s\n", cfd->user_comparator()->Name());
}
assert(cfd->current());
// Print out DebugStrings. Can include non-terminating null characters.
fwrite(cfd->current()->DebugString(hex_).data(), sizeof(char),
cfd->current()->DebugString(hex_).size(), stdout);
}
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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