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7c27f3ddc6
rocksdb/utilities/blob_db/blob_db_impl.cc
Yi Wu 7c27f3ddc6 Blob DB: fix snapshot handling 
Summary:
Blob db will keep blob file if data in the file is visible to an active snapshot. Before this patch it checks whether there is an active snapshot has sequence number greater than the earliest sequence in the file. This is problematic since we take snapshot on every read, if it keep having reads, old blob files will not be cleanup. Change to check if there is an active snapshot falls in the range of [earliest_sequence, obsolete_sequence) where obsolete sequence is
1. if data is relocated to another file by garbage collection, it is the latest sequence at the time garbage collection finish
2. otherwise, it is the latest sequence of the file
Closes https://github.com/facebook/rocksdb/pull/3087

Differential Revision: D6182519

Pulled By: yiwu-arbug

fbshipit-source-id: cdf4c35281f782eb2a9ad6a87b6727bbdff27a45
2017-11-19 19:07:15 -08:00

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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).
#ifndef ROCKSDB_LITE
#include "utilities/blob_db/blob_db_impl.h"
#include <algorithm>
#include <cinttypes>
#include <iomanip>
#include <limits>
#include <memory>
#include "db/db_impl.h"
#include "db/write_batch_internal.h"
#include "monitoring/instrumented_mutex.h"
#include "rocksdb/convenience.h"
#include "rocksdb/env.h"
#include "rocksdb/iterator.h"
#include "rocksdb/utilities/stackable_db.h"
#include "rocksdb/utilities/transaction.h"
#include "table/block.h"
#include "table/block_based_table_builder.h"
#include "table/block_builder.h"
#include "table/meta_blocks.h"
#include "util/cast_util.h"
#include "util/crc32c.h"
#include "util/file_reader_writer.h"
#include "util/filename.h"
#include "util/logging.h"
#include "util/mutexlock.h"
#include "util/random.h"
#include "util/sync_point.h"
#include "util/timer_queue.h"
#include "utilities/blob_db/blob_db_iterator.h"
#include "utilities/blob_db/blob_index.h"
namespace {
int kBlockBasedTableVersionFormat = 2;
} // end namespace
namespace rocksdb {
namespace blob_db {
Random blob_rgen(static_cast<uint32_t>(time(nullptr)));
void BlobDBFlushBeginListener::OnFlushBegin(DB* db, const FlushJobInfo& info) {
if (impl_) impl_->OnFlushBeginHandler(db, info);
}
WalFilter::WalProcessingOption BlobReconcileWalFilter::LogRecordFound(
unsigned long long log_number, const std::string& log_file_name,
const WriteBatch& batch, WriteBatch* new_batch, bool* batch_changed) {
return WalFilter::WalProcessingOption::kContinueProcessing;
}
bool blobf_compare_ttl::operator()(const std::shared_ptr<BlobFile>& lhs,
const std::shared_ptr<BlobFile>& rhs) const {
if (lhs->expiration_range_.first < rhs->expiration_range_.first) {
return true;
}
if (lhs->expiration_range_.first > rhs->expiration_range_.first) {
return false;
}
return lhs->BlobFileNumber() < rhs->BlobFileNumber();
}
void EvictAllVersionsCompactionListener::InternalListener::OnCompaction(
int level, const Slice& key,
CompactionEventListener::CompactionListenerValueType value_type,
const Slice& existing_value, const SequenceNumber& sn, bool is_new) {
assert(impl_->bdb_options_.enable_garbage_collection);
if (!is_new &&
value_type ==
CompactionEventListener::CompactionListenerValueType::kValue) {
BlobIndex blob_index;
Status s = blob_index.DecodeFrom(existing_value);
if (s.ok()) {
if (impl_->debug_level_ >= 3)
ROCKS_LOG_INFO(
impl_->db_options_.info_log,
"CALLBACK COMPACTED OUT KEY: %s SN: %d "
"NEW: %d FN: %" PRIu64 " OFFSET: %" PRIu64 " SIZE: %" PRIu64,
key.ToString().c_str(), sn, is_new, blob_index.file_number(),
blob_index.offset(), blob_index.size());
impl_->override_vals_q_.enqueue({blob_index.file_number(), key.size(),
blob_index.offset(), blob_index.size(),
sn});
}
} else {
if (impl_->debug_level_ >= 3)
ROCKS_LOG_INFO(impl_->db_options_.info_log,
"CALLBACK NEW KEY: %s SN: %d NEW: %d",
key.ToString().c_str(), sn, is_new);
}
}
BlobDBImpl::BlobDBImpl(const std::string& dbname,
const BlobDBOptions& blob_db_options,
const DBOptions& db_options)
: BlobDB(nullptr),
db_impl_(nullptr),
env_(db_options.env),
ttl_extractor_(blob_db_options.ttl_extractor.get()),
bdb_options_(blob_db_options),
db_options_(db_options),
env_options_(db_options),
dir_change_(false),
next_file_number_(1),
epoch_of_(0),
shutdown_(false),
current_epoch_(0),
open_file_count_(0),
last_period_write_(0),
last_period_ampl_(0),
total_periods_write_(0),
total_periods_ampl_(0),
total_blob_space_(0),
open_p1_done_(false),
debug_level_(0),
oldest_file_evicted_(false) {
blob_dir_ = (bdb_options_.path_relative)
? dbname + "/" + bdb_options_.blob_dir
: bdb_options_.blob_dir;
}
Status BlobDBImpl::LinkToBaseDB(DB* db) {
assert(db_ == nullptr);
assert(open_p1_done_);
db_ = db;
// the Base DB in-itself can be a stackable DB
db_impl_ = static_cast_with_check<DBImpl, DB>(db_->GetRootDB());
env_ = db_->GetEnv();
Status s = env_->CreateDirIfMissing(blob_dir_);
if (!s.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to create blob directory: %s status: '%s'",
blob_dir_.c_str(), s.ToString().c_str());
}
s = env_->NewDirectory(blob_dir_, &dir_ent_);
if (!s.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to open blob directory: %s status: '%s'",
blob_dir_.c_str(), s.ToString().c_str());
}
if (!bdb_options_.disable_background_tasks) {
StartBackgroundTasks();
}
return s;
}
BlobDBOptions BlobDBImpl::GetBlobDBOptions() const { return bdb_options_; }
BlobDBImpl::BlobDBImpl(DB* db, const BlobDBOptions& blob_db_options)
: BlobDB(db),
db_impl_(static_cast_with_check<DBImpl, DB>(db)),
bdb_options_(blob_db_options),
db_options_(db->GetOptions()),
env_options_(db_->GetOptions()),
dir_change_(false),
next_file_number_(1),
epoch_of_(0),
shutdown_(false),
current_epoch_(0),
open_file_count_(0),
last_period_write_(0),
last_period_ampl_(0),
total_periods_write_(0),
total_periods_ampl_(0),
total_blob_space_(0),
oldest_file_evicted_(false) {
if (!bdb_options_.blob_dir.empty())
blob_dir_ = (bdb_options_.path_relative)
? db_->GetName() + "/" + bdb_options_.blob_dir
: bdb_options_.blob_dir;
}
BlobDBImpl::~BlobDBImpl() {
// CancelAllBackgroundWork(db_, true);
Shutdown();
}
Status BlobDBImpl::OpenPhase1() {
assert(db_ == nullptr);
if (blob_dir_.empty())
return Status::NotSupported("No blob directory in options");
std::unique_ptr<Directory> dir_ent;
Status s = env_->NewDirectory(blob_dir_, &dir_ent);
if (!s.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to open blob directory: %s status: '%s'",
blob_dir_.c_str(), s.ToString().c_str());
open_p1_done_ = true;
return Status::OK();
}
s = OpenAllFiles();
open_p1_done_ = true;
return s;
}
void BlobDBImpl::StartBackgroundTasks() {
// store a call to a member function and object
tqueue_.add(
kReclaimOpenFilesPeriodMillisecs,
std::bind(&BlobDBImpl::ReclaimOpenFiles, this, std::placeholders::_1));
tqueue_.add(kGCCheckPeriodMillisecs,
std::bind(&BlobDBImpl::RunGC, this, std::placeholders::_1));
if (bdb_options_.enable_garbage_collection) {
tqueue_.add(
kDeleteCheckPeriodMillisecs,
std::bind(&BlobDBImpl::EvictDeletions, this, std::placeholders::_1));
tqueue_.add(
kDeleteCheckPeriodMillisecs,
std::bind(&BlobDBImpl::EvictCompacted, this, std::placeholders::_1));
}
tqueue_.add(
kDeleteObsoleteFilesPeriodMillisecs,
std::bind(&BlobDBImpl::DeleteObsoleteFiles, this, std::placeholders::_1));
tqueue_.add(kSanityCheckPeriodMillisecs,
std::bind(&BlobDBImpl::SanityCheck, this, std::placeholders::_1));
tqueue_.add(kWriteAmplificationStatsPeriodMillisecs,
std::bind(&BlobDBImpl::WaStats, this, std::placeholders::_1));
tqueue_.add(kFSyncFilesPeriodMillisecs,
std::bind(&BlobDBImpl::FsyncFiles, this, std::placeholders::_1));
tqueue_.add(
kCheckSeqFilesPeriodMillisecs,
std::bind(&BlobDBImpl::CheckSeqFiles, this, std::placeholders::_1));
}
void BlobDBImpl::Shutdown() { shutdown_.store(true); }
void BlobDBImpl::OnFlushBeginHandler(DB* db, const FlushJobInfo& info) {
if (shutdown_.load()) return;
// a callback that happens too soon needs to be ignored
if (!db_) return;
FsyncFiles(false);
}
Status BlobDBImpl::GetAllLogFiles(
std::set<std::pair<uint64_t, std::string>>* file_nums) {
std::vector<std::string> all_files;
Status status = env_->GetChildren(blob_dir_, &all_files);
if (!status.ok()) {
return status;
}
for (const auto& f : all_files) {
uint64_t number;
FileType type;
bool psucc = ParseFileName(f, &number, &type);
if (psucc && type == kBlobFile) {
file_nums->insert(std::make_pair(number, f));
} else {
ROCKS_LOG_WARN(db_options_.info_log,
"Skipping file in blob directory %s parse: %d type: %d",
f.c_str(), psucc, ((psucc) ? type : -1));
}
}
return status;
}
Status BlobDBImpl::OpenAllFiles() {
WriteLock wl(&mutex_);
std::set<std::pair<uint64_t, std::string>> file_nums;
Status status = GetAllLogFiles(&file_nums);
if (!status.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to collect files from blob dir: %s status: '%s'",
blob_dir_.c_str(), status.ToString().c_str());
return status;
}
ROCKS_LOG_INFO(db_options_.info_log,
"BlobDir files path: %s count: %d min: %" PRIu64
" max: %" PRIu64,
blob_dir_.c_str(), static_cast<int>(file_nums.size()),
(file_nums.empty()) ? -1 : (file_nums.begin())->first,
(file_nums.empty()) ? -1 : (file_nums.end())->first);
if (!file_nums.empty())
next_file_number_.store((file_nums.rbegin())->first + 1);
for (auto f_iter : file_nums) {
std::string bfpath = BlobFileName(blob_dir_, f_iter.first);
uint64_t size_bytes;
Status s1 = env_->GetFileSize(bfpath, &size_bytes);
if (!s1.ok()) {
ROCKS_LOG_WARN(
db_options_.info_log,
"Unable to get size of %s. File skipped from open status: '%s'",
bfpath.c_str(), s1.ToString().c_str());
continue;
}
if (debug_level_ >= 1)
ROCKS_LOG_INFO(db_options_.info_log, "Blob File open: %s size: %" PRIu64,
bfpath.c_str(), size_bytes);
std::shared_ptr<BlobFile> bfptr =
std::make_shared<BlobFile>(this, blob_dir_, f_iter.first);
bfptr->SetFileSize(size_bytes);
// since this file already existed, we will try to reconcile
// deleted count with LSM
bfptr->gc_once_after_open_ = true;
// read header
std::shared_ptr<Reader> reader;
reader = bfptr->OpenSequentialReader(env_, db_options_, env_options_);
s1 = reader->ReadHeader(&bfptr->header_);
if (!s1.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failure to read header for blob-file %s "
"status: '%s' size: %" PRIu64,
bfpath.c_str(), s1.ToString().c_str(), size_bytes);
continue;
}
bfptr->SetHasTTL(bfptr->header_.has_ttl);
bfptr->header_valid_ = true;
std::shared_ptr<RandomAccessFileReader> ra_reader =
GetOrOpenRandomAccessReader(bfptr, env_, env_options_);
BlobLogFooter bf;
s1 = bfptr->ReadFooter(&bf);
bfptr->CloseRandomAccessLocked();
if (s1.ok()) {
s1 = bfptr->SetFromFooterLocked(bf);
if (!s1.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Header Footer mismatch for blob-file %s "
"status: '%s' size: %" PRIu64,
bfpath.c_str(), s1.ToString().c_str(), size_bytes);
continue;
}
} else {
ROCKS_LOG_INFO(db_options_.info_log,
"File found incomplete (w/o footer) %s", bfpath.c_str());
// sequentially iterate over the file and read all the records
ExpirationRange expiration_range(std::numeric_limits<uint32_t>::max(),
std::numeric_limits<uint32_t>::min());
uint64_t blob_count = 0;
BlobLogRecord record;
Reader::ReadLevel shallow = Reader::kReadHeaderKey;
uint64_t record_start = reader->GetNextByte();
// TODO(arahut) - when we detect corruption, we should truncate
while (reader->ReadRecord(&record, shallow).ok()) {
++blob_count;
if (bfptr->HasTTL()) {
expiration_range.first =
std::min(expiration_range.first, record.expiration);
expiration_range.second =
std::max(expiration_range.second, record.expiration);
}
record_start = reader->GetNextByte();
}
if (record_start != bfptr->GetFileSize()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Blob file is corrupted or crashed during write %s"
" good_size: %" PRIu64 " file_size: %" PRIu64,
bfpath.c_str(), record_start, bfptr->GetFileSize());
}
if (!blob_count) {
ROCKS_LOG_INFO(db_options_.info_log, "BlobCount = 0 in file %s",
bfpath.c_str());
continue;
}
bfptr->SetBlobCount(blob_count);
bfptr->SetSequenceRange({0, 0});
ROCKS_LOG_INFO(db_options_.info_log,
"Blob File: %s blob_count: %" PRIu64
" size_bytes: %" PRIu64 " has_ttl: %d",
bfpath.c_str(), blob_count, size_bytes, bfptr->HasTTL());
if (bfptr->HasTTL()) {
expiration_range.second = std::max(
expiration_range.second,
expiration_range.first + (uint32_t)bdb_options_.ttl_range_secs);
bfptr->set_expiration_range(expiration_range);
uint64_t now = EpochNow();
if (expiration_range.second < now) {
Status fstatus = CreateWriterLocked(bfptr);
if (fstatus.ok()) fstatus = bfptr->WriteFooterAndCloseLocked();
if (!fstatus.ok()) {
ROCKS_LOG_ERROR(
db_options_.info_log,
"Failed to close Blob File: %s status: '%s'. Skipped",
bfpath.c_str(), fstatus.ToString().c_str());
continue;
} else {
ROCKS_LOG_ERROR(
db_options_.info_log,
"Blob File Closed: %s now: %d expiration_range: (%d, %d)",
bfpath.c_str(), now, expiration_range.first,
expiration_range.second);
}
} else {
open_ttl_files_.insert(bfptr);
}
}
}
blob_files_.insert(std::make_pair(f_iter.first, bfptr));
}
return status;
}
void BlobDBImpl::CloseRandomAccessLocked(
const std::shared_ptr<BlobFile>& bfile) {
bfile->CloseRandomAccessLocked();
open_file_count_--;
}
std::shared_ptr<RandomAccessFileReader> BlobDBImpl::GetOrOpenRandomAccessReader(
const std::shared_ptr<BlobFile>& bfile, Env* env,
const EnvOptions& env_options) {
bool fresh_open = false;
auto rar = bfile->GetOrOpenRandomAccessReader(env, env_options, &fresh_open);
if (fresh_open) open_file_count_++;
return rar;
}
std::shared_ptr<BlobFile> BlobDBImpl::NewBlobFile(const std::string& reason) {
uint64_t file_num = next_file_number_++;
auto bfile = std::make_shared<BlobFile>(this, blob_dir_, file_num);
ROCKS_LOG_DEBUG(db_options_.info_log, "New blob file created: %s reason='%s'",
bfile->PathName().c_str(), reason.c_str());
LogFlush(db_options_.info_log);
return bfile;
}
Status BlobDBImpl::CreateWriterLocked(const std::shared_ptr<BlobFile>& bfile) {
std::string fpath(bfile->PathName());
std::unique_ptr<WritableFile> wfile;
Status s = env_->ReopenWritableFile(fpath, &wfile, env_options_);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to open blob file for write: %s status: '%s'"
" exists: '%s'",
fpath.c_str(), s.ToString().c_str(),
env_->FileExists(fpath).ToString().c_str());
return s;
}
std::unique_ptr<WritableFileWriter> fwriter;
fwriter.reset(new WritableFileWriter(std::move(wfile), env_options_));
uint64_t boffset = bfile->GetFileSize();
if (debug_level_ >= 2 && boffset) {
ROCKS_LOG_DEBUG(db_options_.info_log, "Open blob file: %s with offset: %d",
fpath.c_str(), boffset);
}
Writer::ElemType et = Writer::kEtNone;
if (bfile->file_size_ == BlobLogHeader::kSize) {
et = Writer::kEtFileHdr;
} else if (bfile->file_size_ > BlobLogHeader::kSize) {
et = Writer::kEtRecord;
} else if (bfile->file_size_) {
ROCKS_LOG_WARN(db_options_.info_log,
"Open blob file: %s with wrong size: %d", fpath.c_str(),
boffset);
return Status::Corruption("Invalid blob file size");
}
bfile->log_writer_ = std::make_shared<Writer>(
std::move(fwriter), bfile->file_number_, bdb_options_.bytes_per_sync,
db_options_.use_fsync, boffset);
bfile->log_writer_->last_elem_type_ = et;
return s;
}
std::shared_ptr<BlobFile> BlobDBImpl::FindBlobFileLocked(
uint64_t expiration) const {
if (open_ttl_files_.empty()) return nullptr;
std::shared_ptr<BlobFile> tmp = std::make_shared<BlobFile>();
tmp->expiration_range_ = std::make_pair(expiration, 0);
auto citr = open_ttl_files_.equal_range(tmp);
if (citr.first == open_ttl_files_.end()) {
assert(citr.second == open_ttl_files_.end());
std::shared_ptr<BlobFile> check = *(open_ttl_files_.rbegin());
return (check->expiration_range_.second < expiration) ? nullptr : check;
}
if (citr.first != citr.second) return *(citr.first);
auto finditr = citr.second;
if (finditr != open_ttl_files_.begin()) --finditr;
bool b2 = (*finditr)->expiration_range_.second < expiration;
bool b1 = (*finditr)->expiration_range_.first > expiration;
return (b1 || b2) ? nullptr : (*finditr);
}
std::shared_ptr<Writer> BlobDBImpl::CheckOrCreateWriterLocked(
const std::shared_ptr<BlobFile>& bfile) {
std::shared_ptr<Writer> writer = bfile->GetWriter();
if (writer) return writer;
Status s = CreateWriterLocked(bfile);
if (!s.ok()) return nullptr;
writer = bfile->GetWriter();
return writer;
}
std::shared_ptr<BlobFile> BlobDBImpl::SelectBlobFile() {
{
ReadLock rl(&mutex_);
if (open_non_ttl_file_ != nullptr) {
return open_non_ttl_file_;
}
}
// CHECK again
WriteLock wl(&mutex_);
if (open_non_ttl_file_ != nullptr) {
return open_non_ttl_file_;
}
std::shared_ptr<BlobFile> bfile = NewBlobFile("SelectBlobFile");
assert(bfile);
// file not visible, hence no lock
std::shared_ptr<Writer> writer = CheckOrCreateWriterLocked(bfile);
if (!writer) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to get writer from blob file: %s",
bfile->PathName().c_str());
return nullptr;
}
bfile->file_size_ = BlobLogHeader::kSize;
bfile->header_.compression = bdb_options_.compression;
bfile->header_.has_ttl = false;
bfile->header_.column_family_id =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->GetID();
bfile->header_valid_ = true;
bfile->SetHasTTL(false);
Status s = writer->WriteHeader(bfile->header_);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to write header to new blob file: %s"
" status: '%s'",
bfile->PathName().c_str(), s.ToString().c_str());
return nullptr;
}
dir_change_.store(true);
blob_files_.insert(std::make_pair(bfile->BlobFileNumber(), bfile));
open_non_ttl_file_ = bfile;
return bfile;
}
std::shared_ptr<BlobFile> BlobDBImpl::SelectBlobFileTTL(uint64_t expiration) {
assert(expiration != kNoExpiration);
uint64_t epoch_read = 0;
std::shared_ptr<BlobFile> bfile;
{
ReadLock rl(&mutex_);
bfile = FindBlobFileLocked(expiration);
epoch_read = epoch_of_.load();
}
if (bfile) {
assert(!bfile->Immutable());
return bfile;
}
uint64_t exp_low =
(expiration / bdb_options_.ttl_range_secs) * bdb_options_.ttl_range_secs;
uint64_t exp_high = exp_low + bdb_options_.ttl_range_secs;
ExpirationRange expiration_range = std::make_pair(exp_low, exp_high);
bfile = NewBlobFile("SelectBlobFileTTL");
assert(bfile);
ROCKS_LOG_INFO(db_options_.info_log, "New blob file TTL range: %s %d %d",
bfile->PathName().c_str(), exp_low, exp_high);
LogFlush(db_options_.info_log);
// we don't need to take lock as no other thread is seeing bfile yet
std::shared_ptr<Writer> writer = CheckOrCreateWriterLocked(bfile);
if (!writer) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to get writer from blob file with TTL: %s",
bfile->PathName().c_str());
return nullptr;
}
bfile->header_.expiration_range = expiration_range;
bfile->header_.compression = bdb_options_.compression;
bfile->header_.has_ttl = true;
bfile->header_.column_family_id =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->GetID();
;
bfile->header_valid_ = true;
bfile->SetHasTTL(true);
bfile->file_size_ = BlobLogHeader::kSize;
// set the first value of the range, since that is
// concrete at this time. also necessary to add to open_ttl_files_
bfile->expiration_range_ = expiration_range;
WriteLock wl(&mutex_);
// in case the epoch has shifted in the interim, then check
// check condition again - should be rare.
if (epoch_of_.load() != epoch_read) {
auto bfile2 = FindBlobFileLocked(expiration);
if (bfile2) return bfile2;
}
Status s = writer->WriteHeader(bfile->header_);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to write header to new blob file: %s"
" status: '%s'",
bfile->PathName().c_str(), s.ToString().c_str());
return nullptr;
}
dir_change_.store(true);
blob_files_.insert(std::make_pair(bfile->BlobFileNumber(), bfile));
open_ttl_files_.insert(bfile);
epoch_of_++;
return bfile;
}
Status BlobDBImpl::Delete(const WriteOptions& options, const Slice& key) {
SequenceNumber lsn = db_impl_->GetLatestSequenceNumber();
Status s = db_->Delete(options, key);
if (bdb_options_.enable_garbage_collection) {
// add deleted key to list of keys that have been deleted for book-keeping
delete_keys_q_.enqueue({DefaultColumnFamily(), key.ToString(), lsn});
}
return s;
}
class BlobDBImpl::BlobInserter : public WriteBatch::Handler {
private:
const WriteOptions& options_;
BlobDBImpl* blob_db_impl_;
uint32_t default_cf_id_;
SequenceNumber sequence_;
WriteBatch batch_;
public:
BlobInserter(const WriteOptions& options, BlobDBImpl* blob_db_impl,
uint32_t default_cf_id, SequenceNumber seq)
: options_(options),
blob_db_impl_(blob_db_impl),
default_cf_id_(default_cf_id),
sequence_(seq) {}
SequenceNumber sequence() { return sequence_; }
WriteBatch* batch() { return &batch_; }
virtual Status PutCF(uint32_t column_family_id, const Slice& key,
const Slice& value) override {
if (column_family_id != default_cf_id_) {
return Status::NotSupported(
"Blob DB doesn't support non-default column family.");
}
std::string new_value;
Slice value_slice;
uint64_t expiration =
blob_db_impl_->ExtractExpiration(key, value, &value_slice, &new_value);
Status s = blob_db_impl_->PutBlobValue(options_, key, value_slice,
expiration, sequence_, &batch_);
sequence_++;
return s;
}
virtual Status DeleteCF(uint32_t column_family_id,
const Slice& key) override {
if (column_family_id != default_cf_id_) {
return Status::NotSupported(
"Blob DB doesn't support non-default column family.");
}
Status s = WriteBatchInternal::Delete(&batch_, column_family_id, key);
sequence_++;
return s;
}
virtual Status DeleteRange(uint32_t column_family_id, const Slice& begin_key,
const Slice& end_key) {
if (column_family_id != default_cf_id_) {
return Status::NotSupported(
"Blob DB doesn't support non-default column family.");
}
Status s = WriteBatchInternal::DeleteRange(&batch_, column_family_id,
begin_key, end_key);
sequence_++;
return s;
}
virtual Status SingleDeleteCF(uint32_t /*column_family_id*/,
const Slice& /*key*/) override {
return Status::NotSupported("Not supported operation in blob db.");
}
virtual Status MergeCF(uint32_t /*column_family_id*/, const Slice& /*key*/,
const Slice& /*value*/) override {
return Status::NotSupported("Not supported operation in blob db.");
}
virtual void LogData(const Slice& blob) override { batch_.PutLogData(blob); }
};
Status BlobDBImpl::Write(const WriteOptions& options, WriteBatch* updates) {
MutexLock l(&write_mutex_);
uint32_t default_cf_id =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->GetID();
SequenceNumber current_seq = GetLatestSequenceNumber() + 1;
BlobInserter blob_inserter(options, this, default_cf_id, current_seq);
Status s = updates->Iterate(&blob_inserter);
if (!s.ok()) {
return s;
}
s = db_->Write(options, blob_inserter.batch());
if (!s.ok()) {
return s;
}
assert(blob_inserter.sequence() == GetLatestSequenceNumber() + 1);
// add deleted key to list of keys that have been deleted for book-keeping
class DeleteBookkeeper : public WriteBatch::Handler {
public:
explicit DeleteBookkeeper(BlobDBImpl* impl, const SequenceNumber& seq)
: impl_(impl), sequence_(seq) {}
virtual Status PutCF(uint32_t /*column_family_id*/, const Slice& /*key*/,
const Slice& /*value*/) override {
sequence_++;
return Status::OK();
}
virtual Status DeleteCF(uint32_t column_family_id,
const Slice& key) override {
ColumnFamilyHandle* cfh =
impl_->db_impl_->GetColumnFamilyHandleUnlocked(column_family_id);
impl_->delete_keys_q_.enqueue({cfh, key.ToString(), sequence_});
sequence_++;
return Status::OK();
}
private:
BlobDBImpl* impl_;
SequenceNumber sequence_;
};
if (bdb_options_.enable_garbage_collection) {
// add deleted key to list of keys that have been deleted for book-keeping
DeleteBookkeeper delete_bookkeeper(this, current_seq);
s = updates->Iterate(&delete_bookkeeper);
}
return s;
}
Status BlobDBImpl::GetLiveFiles(std::vector<std::string>& ret,
uint64_t* manifest_file_size,
bool flush_memtable) {
// Hold a lock in the beginning to avoid updates to base DB during the call
ReadLock rl(&mutex_);
Status s = db_->GetLiveFiles(ret, manifest_file_size, flush_memtable);
if (!s.ok()) {
return s;
}
ret.reserve(ret.size() + blob_files_.size());
for (auto bfile_pair : blob_files_) {
auto blob_file = bfile_pair.second;
ret.emplace_back(blob_file->PathName());
}
return Status::OK();
}
void BlobDBImpl::GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata) {
// Hold a lock in the beginning to avoid updates to base DB during the call
ReadLock rl(&mutex_);
db_->GetLiveFilesMetaData(metadata);
for (auto bfile_pair : blob_files_) {
auto blob_file = bfile_pair.second;
LiveFileMetaData filemetadata;
filemetadata.size = blob_file->GetFileSize();
filemetadata.name = blob_file->PathName();
auto cfh =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily());
filemetadata.column_family_name = cfh->GetName();
metadata->emplace_back(filemetadata);
}
}
Status BlobDBImpl::Put(const WriteOptions& options, const Slice& key,
const Slice& value) {
std::string new_value;
Slice value_slice;
uint64_t expiration = ExtractExpiration(key, value, &value_slice, &new_value);
return PutUntil(options, key, value_slice, expiration);
}
Status BlobDBImpl::PutWithTTL(const WriteOptions& options,
const Slice& key, const Slice& value,
uint64_t ttl) {
uint64_t now = EpochNow();
uint64_t expiration = kNoExpiration - now > ttl ? now + ttl : kNoExpiration;
return PutUntil(options, key, value, expiration);
}
Status BlobDBImpl::PutUntil(const WriteOptions& options, const Slice& key,
const Slice& value, uint64_t expiration) {
TEST_SYNC_POINT("BlobDBImpl::PutUntil:Start");
MutexLock l(&write_mutex_);
SequenceNumber sequence = GetLatestSequenceNumber() + 1;
WriteBatch batch;
Status s = PutBlobValue(options, key, value, expiration, sequence, &batch);
if (s.ok()) {
s = db_->Write(options, &batch);
}
TEST_SYNC_POINT("BlobDBImpl::PutUntil:Finish");
return s;
}
Status BlobDBImpl::PutBlobValue(const WriteOptions& options, const Slice& key,
const Slice& value, uint64_t expiration,
SequenceNumber sequence, WriteBatch* batch) {
Status s;
std::string index_entry;
uint32_t column_family_id =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->GetID();
if (value.size() < bdb_options_.min_blob_size) {
if (expiration == kNoExpiration) {
// Put as normal value
s = batch->Put(key, value);
} else {
// Inlined with TTL
BlobIndex::EncodeInlinedTTL(&index_entry, expiration, value);
s = WriteBatchInternal::PutBlobIndex(batch, column_family_id, key,
index_entry);
}
} else {
std::shared_ptr<BlobFile> bfile = (expiration != kNoExpiration)
? SelectBlobFileTTL(expiration)
: SelectBlobFile();
if (!bfile) {
return Status::NotFound("Blob file not found");
}
std::string compression_output;
Slice value_compressed = GetCompressedSlice(value, &compression_output);
std::string headerbuf;
Writer::ConstructBlobHeader(&headerbuf, key, value_compressed, expiration);
s = AppendBlob(bfile, headerbuf, key, value_compressed, expiration,
&index_entry);
if (s.ok()) {
bfile->ExtendSequenceRange(sequence);
if (expiration != kNoExpiration) {
bfile->ExtendExpirationRange(expiration);
}
s = CloseBlobFileIfNeeded(bfile);
if (s.ok()) {
s = WriteBatchInternal::PutBlobIndex(batch, column_family_id, key,
index_entry);
}
} else {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to append blob to FILE: %s: KEY: %s VALSZ: %d"
" status: '%s' blob_file: '%s'",
bfile->PathName().c_str(), key.ToString().c_str(),
value.size(), s.ToString().c_str(),
bfile->DumpState().c_str());
}
}
return s;
}
Slice BlobDBImpl::GetCompressedSlice(const Slice& raw,
std::string* compression_output) const {
if (bdb_options_.compression == kNoCompression) {
return raw;
}
CompressionType ct = bdb_options_.compression;
CompressionOptions compression_opts;
CompressBlock(raw, compression_opts, &ct, kBlockBasedTableVersionFormat,
Slice(), compression_output);
return *compression_output;
}
uint64_t BlobDBImpl::ExtractExpiration(const Slice& key, const Slice& value,
Slice* value_slice,
std::string* new_value) {
uint64_t expiration = kNoExpiration;
bool has_expiration = false;
bool value_changed = false;
if (ttl_extractor_ != nullptr) {
has_expiration = ttl_extractor_->ExtractExpiration(
key, value, EpochNow(), &expiration, new_value, &value_changed);
}
*value_slice = value_changed ? Slice(*new_value) : value;
return has_expiration ? expiration : kNoExpiration;
}
std::shared_ptr<BlobFile> BlobDBImpl::GetOldestBlobFile() {
std::vector<std::shared_ptr<BlobFile>> blob_files;
CopyBlobFiles(&blob_files, [](const std::shared_ptr<BlobFile>& f) {
return !f->Obsolete() && f->Immutable();
});
blobf_compare_ttl compare;
return *std::min_element(blob_files.begin(), blob_files.end(), compare);
}
bool BlobDBImpl::EvictOldestBlobFile() {
auto oldest_file = GetOldestBlobFile();
if (oldest_file == nullptr) {
return false;
}
WriteLock wl(&mutex_);
// Double check the file is not obsolete by others
if (oldest_file_evicted_ == false && !oldest_file->Obsolete()) {
auto expiration_range = oldest_file->GetExpirationRange();
ROCKS_LOG_INFO(db_options_.info_log,
"Evict oldest blob file since DB out of space. Current "
"space used: %" PRIu64 ", blob dir size: %" PRIu64
", evicted blob file #%" PRIu64
" with expiration range (%" PRIu64 ", %" PRIu64 ").",
total_blob_space_.load(), bdb_options_.blob_dir_size,
oldest_file->BlobFileNumber(), expiration_range.first,
expiration_range.second);
oldest_file->MarkObsolete(oldest_file->GetSequenceRange().second);
obsolete_files_.push_back(oldest_file);
oldest_file_evicted_.store(true);
return true;
}
return false;
}
Status BlobDBImpl::CheckSize(size_t blob_size) {
uint64_t new_space_util = total_blob_space_.load() + blob_size;
if (bdb_options_.blob_dir_size > 0) {
if (!bdb_options_.is_fifo &&
(new_space_util > bdb_options_.blob_dir_size)) {
return Status::NoSpace(
"Write failed, as writing it would exceed blob_dir_size limit.");
}
if (bdb_options_.is_fifo && !oldest_file_evicted_.load() &&
(new_space_util >
kEvictOldestFileAtSize * bdb_options_.blob_dir_size)) {
EvictOldestBlobFile();
}
}
return Status::OK();
}
Status BlobDBImpl::AppendBlob(const std::shared_ptr<BlobFile>& bfile,
const std::string& headerbuf, const Slice& key,
const Slice& value, uint64_t expiration,
std::string* index_entry) {
auto size_put = BlobLogRecord::kHeaderSize + key.size() + value.size();
Status s = CheckSize(size_put);
if (!s.ok()) {
return s;
}
uint64_t blob_offset = 0;
uint64_t key_offset = 0;
{
WriteLock lockbfile_w(&bfile->mutex_);
std::shared_ptr<Writer> writer = CheckOrCreateWriterLocked(bfile);
if (!writer) return Status::IOError("Failed to create blob writer");
// write the blob to the blob log.
s = writer->EmitPhysicalRecord(headerbuf, key, value, &key_offset,
&blob_offset);
}
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Invalid status in AppendBlob: %s status: '%s'",
bfile->PathName().c_str(), s.ToString().c_str());
return s;
}
// increment blob count
bfile->blob_count_++;
bfile->file_size_ += size_put;
last_period_write_ += size_put;
total_blob_space_ += size_put;
if (expiration == kNoExpiration) {
BlobIndex::EncodeBlob(index_entry, bfile->BlobFileNumber(), blob_offset,
value.size(), bdb_options_.compression);
} else {
BlobIndex::EncodeBlobTTL(index_entry, expiration, bfile->BlobFileNumber(),
blob_offset, value.size(),
bdb_options_.compression);
}
return s;
}
std::vector<Status> BlobDBImpl::MultiGet(
const ReadOptions& read_options,
const std::vector<Slice>& keys, std::vector<std::string>* values) {
// Get a snapshot to avoid blob file get deleted between we
// fetch and index entry and reading from the file.
ReadOptions ro(read_options);
bool snapshot_created = SetSnapshotIfNeeded(&ro);
std::vector<Status> statuses;
statuses.reserve(keys.size());
values->clear();
values->reserve(keys.size());
PinnableSlice value;
for (size_t i = 0; i < keys.size(); i++) {
statuses.push_back(Get(ro, DefaultColumnFamily(), keys[i], &value));
values->push_back(value.ToString());
value.Reset();
}
if (snapshot_created) {
db_->ReleaseSnapshot(ro.snapshot);
}
return statuses;
}
bool BlobDBImpl::SetSnapshotIfNeeded(ReadOptions* read_options) {
assert(read_options != nullptr);
if (read_options->snapshot != nullptr) {
return false;
}
read_options->snapshot = db_->GetSnapshot();
return true;
}
Status BlobDBImpl::GetBlobValue(const Slice& key, const Slice& index_entry,
PinnableSlice* value) {
assert(value != nullptr);
BlobIndex blob_index;
Status s = blob_index.DecodeFrom(index_entry);
if (!s.ok()) {
return s;
}
if (blob_index.HasTTL() && blob_index.expiration() <= EpochNow()) {
return Status::NotFound("Key expired");
}
if (blob_index.IsInlined()) {
// TODO(yiwu): If index_entry is a PinnableSlice, we can also pin the same
// memory buffer to avoid extra copy.
value->PinSelf(blob_index.value());
return Status::OK();
}
if (blob_index.size() == 0) {
value->PinSelf("");
return Status::OK();
}
// offset has to have certain min, as we will read CRC
// later from the Blob Header, which needs to be also a
// valid offset.
if (blob_index.offset() <
(BlobLogHeader::kSize + BlobLogRecord::kHeaderSize + key.size())) {
if (debug_level_ >= 2) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Invalid blob index file_number: %" PRIu64
" blob_offset: %" PRIu64 " blob_size: %" PRIu64
" key: %s",
blob_index.file_number(), blob_index.offset(),
blob_index.size(), key.data());
}
return Status::NotFound("Invalid blob offset");
}
std::shared_ptr<BlobFile> bfile;
{
ReadLock rl(&mutex_);
auto hitr = blob_files_.find(blob_index.file_number());
// file was deleted
if (hitr == blob_files_.end()) {
return Status::NotFound("Blob Not Found as blob file missing");
}
bfile = hitr->second;
}
if (blob_index.size() == 0 && value != nullptr) {
value->PinSelf("");
return Status::OK();
}
// takes locks when called
std::shared_ptr<RandomAccessFileReader> reader =
GetOrOpenRandomAccessReader(bfile, env_, env_options_);
std::string* valueptr = value->GetSelf();
std::string value_c;
if (bdb_options_.compression != kNoCompression) {
valueptr = &value_c;
}
// Allocate the buffer. This is safe in C++11
// Note that std::string::reserved() does not work, since previous value
// of the buffer can be larger than blob_index.size().
valueptr->resize(blob_index.size());
char* buffer = &(*valueptr)[0];
Slice blob_value;
s = reader->Read(blob_index.offset(), blob_index.size(), &blob_value, buffer);
if (!s.ok() || blob_value.size() != blob_index.size()) {
if (debug_level_ >= 2) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to read blob from file: %s blob_offset: %" PRIu64
" blob_size: %" PRIu64 " read: %d key: %s status: '%s'",
bfile->PathName().c_str(), blob_index.offset(),
blob_index.size(), static_cast<int>(blob_value.size()),
key.data(), s.ToString().c_str());
}
return Status::NotFound("Blob Not Found as couldnt retrieve Blob");
}
// TODO(yiwu): Add an option to skip crc checking.
Slice crc_slice;
uint32_t crc_exp;
std::string crc_str;
crc_str.resize(sizeof(uint32_t));
char* crc_buffer = &(crc_str[0]);
s = reader->Read(blob_index.offset() - (key.size() + sizeof(uint32_t)),
sizeof(uint32_t), &crc_slice, crc_buffer);
if (!s.ok() || !GetFixed32(&crc_slice, &crc_exp)) {
if (debug_level_ >= 2) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to fetch blob crc file: %s blob_offset: %" PRIu64
" blob_size: %" PRIu64 " key: %s status: '%s'",
bfile->PathName().c_str(), blob_index.offset(),
blob_index.size(), key.data(), s.ToString().c_str());
}
return Status::NotFound("Blob Not Found as couldnt retrieve CRC");
}
uint32_t crc = crc32c::Value(key.data(), key.size());
crc = crc32c::Extend(crc, blob_value.data(), blob_value.size());
crc = crc32c::Mask(crc); // Adjust for storage
if (crc != crc_exp) {
if (debug_level_ >= 2) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Blob crc mismatch file: %s blob_offset: %" PRIu64
" blob_size: %" PRIu64 " key: %s status: '%s'",
bfile->PathName().c_str(), blob_index.offset(),
blob_index.size(), key.data(), s.ToString().c_str());
}
return Status::Corruption("Corruption. Blob CRC mismatch");
}
// TODO(yiwu): Should use compression flag in the blob file instead of
// current compression option.
if (bdb_options_.compression != kNoCompression) {
BlockContents contents;
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily());
s = UncompressBlockContentsForCompressionType(
blob_value.data(), blob_value.size(), &contents,
kBlockBasedTableVersionFormat, Slice(), bdb_options_.compression,
*(cfh->cfd()->ioptions()));
*(value->GetSelf()) = contents.data.ToString();
}
value->PinSelf();
return s;
}
Status BlobDBImpl::Get(const ReadOptions& read_options,
ColumnFamilyHandle* column_family, const Slice& key,
PinnableSlice* value) {
if (column_family != DefaultColumnFamily()) {
return Status::NotSupported(
"Blob DB doesn't support non-default column family.");
}
// Get a snapshot to avoid blob file get deleted between we
// fetch and index entry and reading from the file.
// TODO(yiwu): For Get() retry if file not found would be a simpler strategy.
ReadOptions ro(read_options);
bool snapshot_created = SetSnapshotIfNeeded(&ro);
Status s;
bool is_blob_index = false;
s = db_impl_->GetImpl(ro, column_family, key, value, nullptr /*value_found*/,
nullptr /*read_callback*/, &is_blob_index);
TEST_SYNC_POINT("BlobDBImpl::Get:AfterIndexEntryGet:1");
TEST_SYNC_POINT("BlobDBImpl::Get:AfterIndexEntryGet:2");
if (s.ok()) {
if (is_blob_index) {
PinnableSlice index_entry = std::move(*value);
s = GetBlobValue(key, index_entry, value);
}
}
if (snapshot_created) {
db_->ReleaseSnapshot(ro.snapshot);
}
return s;
}
std::pair<bool, int64_t> BlobDBImpl::SanityCheck(bool aborted) {
if (aborted) return std::make_pair(false, -1);
ROCKS_LOG_INFO(db_options_.info_log, "Starting Sanity Check");
ROCKS_LOG_INFO(db_options_.info_log, "Number of files %" PRIu64,
blob_files_.size());
ROCKS_LOG_INFO(db_options_.info_log, "Number of open files %" PRIu64,
open_ttl_files_.size());
for (auto bfile : open_ttl_files_) {
assert(!bfile->Immutable());
}
uint64_t epoch_now = EpochNow();
for (auto bfile_pair : blob_files_) {
auto bfile = bfile_pair.second;
ROCKS_LOG_INFO(
db_options_.info_log,
"Blob File %s %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64,
bfile->PathName().c_str(), bfile->GetFileSize(), bfile->BlobCount(),
bfile->deleted_count_, bfile->deleted_size_,
(bfile->expiration_range_.second - epoch_now));
}
// reschedule
return std::make_pair(true, -1);
}
Status BlobDBImpl::CloseBlobFile(std::shared_ptr<BlobFile> bfile) {
assert(bfile != nullptr);
Status s;
ROCKS_LOG_INFO(db_options_.info_log, "Close blob file %" PRIu64,
bfile->BlobFileNumber());
{
WriteLock wl(&mutex_);
if (bfile->HasTTL()) {
size_t erased __attribute__((__unused__));
erased = open_ttl_files_.erase(bfile);
assert(erased == 1);
} else {
assert(bfile == open_non_ttl_file_);
open_non_ttl_file_ = nullptr;
}
}
if (!bfile->closed_.load()) {
WriteLock lockbfile_w(&bfile->mutex_);
s = bfile->WriteFooterAndCloseLocked();
}
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failed to close blob file %" PRIu64 "with error: %s",
bfile->BlobFileNumber(), s.ToString().c_str());
}
return s;
}
Status BlobDBImpl::CloseBlobFileIfNeeded(std::shared_ptr<BlobFile>& bfile) {
// atomic read
if (bfile->GetFileSize() < bdb_options_.blob_file_size) {
return Status::OK();
}
return CloseBlobFile(bfile);
}
bool BlobDBImpl::VisibleToActiveSnapshot(
const std::shared_ptr<BlobFile>& bfile) {
assert(bfile->Obsolete());
SequenceNumber first_sequence = bfile->GetSequenceRange().first;
SequenceNumber obsolete_sequence = bfile->GetObsoleteSequence();
return db_impl_->HasActiveSnapshotInRange(first_sequence, obsolete_sequence);
}
bool BlobDBImpl::FindFileAndEvictABlob(uint64_t file_number, uint64_t key_size,
uint64_t blob_offset,
uint64_t blob_size) {
assert(bdb_options_.enable_garbage_collection);
(void)blob_offset;
std::shared_ptr<BlobFile> bfile;
{
ReadLock rl(&mutex_);
auto hitr = blob_files_.find(file_number);
// file was deleted
if (hitr == blob_files_.end()) {
return false;
}
bfile = hitr->second;
}
WriteLock lockbfile_w(&bfile->mutex_);
bfile->deleted_count_++;
bfile->deleted_size_ += key_size + blob_size + BlobLogRecord::kHeaderSize;
return true;
}
bool BlobDBImpl::MarkBlobDeleted(const Slice& key, const Slice& index_entry) {
assert(bdb_options_.enable_garbage_collection);
BlobIndex blob_index;
Status s = blob_index.DecodeFrom(index_entry);
if (!s.ok()) {
ROCKS_LOG_INFO(db_options_.info_log,
"Could not parse lsm val in MarkBlobDeleted %s",
index_entry.ToString().c_str());
return false;
}
bool succ = FindFileAndEvictABlob(blob_index.file_number(), key.size(),
blob_index.offset(), blob_index.size());
return succ;
}
std::pair<bool, int64_t> BlobDBImpl::EvictCompacted(bool aborted) {
assert(bdb_options_.enable_garbage_collection);
if (aborted) return std::make_pair(false, -1);
override_packet_t packet;
size_t total_vals = 0;
size_t mark_evicted = 0;
while (override_vals_q_.dequeue(&packet)) {
bool succeeded =
FindFileAndEvictABlob(packet.file_number_, packet.key_size_,
packet.blob_offset_, packet.blob_size_);
total_vals++;
if (succeeded) {
mark_evicted++;
}
}
ROCKS_LOG_INFO(db_options_.info_log,
"Mark %" ROCKSDB_PRIszt
" values to evict, out of %" ROCKSDB_PRIszt
" compacted values.",
mark_evicted, total_vals);
return std::make_pair(true, -1);
}
std::pair<bool, int64_t> BlobDBImpl::EvictDeletions(bool aborted) {
assert(bdb_options_.enable_garbage_collection);
if (aborted) return std::make_pair(false, -1);
ColumnFamilyHandle* last_cfh = nullptr;
Options last_op;
Arena arena;
ScopedArenaIterator iter;
// we will use same RangeDelAggregator for all cf's.
// essentially we do not support Range Deletes now
std::unique_ptr<RangeDelAggregator> range_del_agg;
delete_packet_t dpacket;
while (delete_keys_q_.dequeue(&dpacket)) {
if (last_cfh != dpacket.cfh_) {
if (!range_del_agg) {
auto cfhi = reinterpret_cast<ColumnFamilyHandleImpl*>(dpacket.cfh_);
auto cfd = cfhi->cfd();
range_del_agg.reset(new RangeDelAggregator(cfd->internal_comparator(),
kMaxSequenceNumber));
}
// this can be expensive
last_cfh = dpacket.cfh_;
last_op = db_impl_->GetOptions(last_cfh);
iter.set(db_impl_->NewInternalIterator(&arena, range_del_agg.get(),
dpacket.cfh_));
// this will not work for multiple CF's.
}
Slice user_key(dpacket.key_);
InternalKey target(user_key, dpacket.dsn_, kTypeValue);
Slice eslice = target.Encode();
iter->Seek(eslice);
if (!iter->status().ok()) {
ROCKS_LOG_INFO(db_options_.info_log, "Invalid iterator seek %s",
dpacket.key_.c_str());
continue;
}
const Comparator* bwc = BytewiseComparator();
while (iter->Valid()) {
if (!bwc->Equal(ExtractUserKey(iter->key()), ExtractUserKey(eslice)))
break;
ParsedInternalKey ikey(Slice(), 0, kTypeValue);
if (!ParseInternalKey(iter->key(), &ikey)) {
continue;
}
// once you hit a DELETE, assume the keys below have been
// processed previously
if (ikey.type == kTypeDeletion || ikey.type == kTypeSingleDeletion) break;
Slice val = iter->value();
MarkBlobDeleted(ikey.user_key, val);
iter->Next();
}
}
return std::make_pair(true, -1);
}
std::pair<bool, int64_t> BlobDBImpl::CheckSeqFiles(bool aborted) {
if (aborted) return std::make_pair(false, -1);
std::vector<std::shared_ptr<BlobFile>> process_files;
{
uint64_t epoch_now = EpochNow();
ReadLock rl(&mutex_);
for (auto bfile : open_ttl_files_) {
{
ReadLock lockbfile_r(&bfile->mutex_);
if (bfile->expiration_range_.second > epoch_now) continue;
process_files.push_back(bfile);
}
}
}
for (auto bfile : process_files) {
CloseBlobFile(bfile);
}
return std::make_pair(true, -1);
}
std::pair<bool, int64_t> BlobDBImpl::FsyncFiles(bool aborted) {
if (aborted) return std::make_pair(false, -1);
MutexLock l(&write_mutex_);
std::vector<std::shared_ptr<BlobFile>> process_files;
{
ReadLock rl(&mutex_);
for (auto fitr : open_ttl_files_) {
if (fitr->NeedsFsync(true, bdb_options_.bytes_per_sync))
process_files.push_back(fitr);
}
if (open_non_ttl_file_ != nullptr &&
open_non_ttl_file_->NeedsFsync(true, bdb_options_.bytes_per_sync)) {
process_files.push_back(open_non_ttl_file_);
}
}
for (auto fitr : process_files) {
if (fitr->NeedsFsync(true, bdb_options_.bytes_per_sync)) fitr->Fsync();
}
bool expected = true;
if (dir_change_.compare_exchange_weak(expected, false)) dir_ent_->Fsync();
return std::make_pair(true, -1);
}
std::pair<bool, int64_t> BlobDBImpl::ReclaimOpenFiles(bool aborted) {
if (aborted) return std::make_pair(false, -1);
if (open_file_count_.load() < kOpenFilesTrigger) {
return std::make_pair(true, -1);
}
// in the future, we should sort by last_access_
// instead of closing every file
ReadLock rl(&mutex_);
for (auto const& ent : blob_files_) {
auto bfile = ent.second;
if (bfile->last_access_.load() == -1) continue;
WriteLock lockbfile_w(&bfile->mutex_);
CloseRandomAccessLocked(bfile);
}
return std::make_pair(true, -1);
}
// TODO(yiwu): correct the stats and expose it.
std::pair<bool, int64_t> BlobDBImpl::WaStats(bool aborted) {
if (aborted) return std::make_pair(false, -1);
WriteLock wl(&mutex_);
if (all_periods_write_.size() >= kWriteAmplificationStatsPeriods) {
total_periods_write_ -= (*all_periods_write_.begin());
total_periods_ampl_ = (*all_periods_ampl_.begin());
all_periods_write_.pop_front();
all_periods_ampl_.pop_front();
}
uint64_t val1 = last_period_write_.load();
uint64_t val2 = last_period_ampl_.load();
all_periods_write_.push_back(val1);
all_periods_ampl_.push_back(val2);
last_period_write_ = 0;
last_period_ampl_ = 0;
total_periods_write_ += val1;
total_periods_ampl_ += val2;
return std::make_pair(true, -1);
}
// Write callback for garbage collection to check if key has been updated
// since last read. Similar to how OptimisticTransaction works. See inline
// comment in GCFileAndUpdateLSM().
class BlobDBImpl::GarbageCollectionWriteCallback : public WriteCallback {
public:
GarbageCollectionWriteCallback(ColumnFamilyData* cfd, const Slice& key,
SequenceNumber upper_bound)
: cfd_(cfd), key_(key), upper_bound_(upper_bound) {}
virtual Status Callback(DB* db) override {
auto* db_impl = reinterpret_cast<DBImpl*>(db);
auto* sv = db_impl->GetAndRefSuperVersion(cfd_);
SequenceNumber latest_seq = 0;
bool found_record_for_key = false;
bool is_blob_index = false;
Status s = db_impl->GetLatestSequenceForKey(
sv, key_, false /*cache_only*/, &latest_seq, &found_record_for_key,
&is_blob_index);
db_impl->ReturnAndCleanupSuperVersion(cfd_, sv);
if (!s.ok() && !s.IsNotFound()) {
// Error.
assert(!s.IsBusy());
return s;
}
if (s.IsNotFound()) {
assert(!found_record_for_key);
return Status::Busy("Key deleted");
}
assert(found_record_for_key);
assert(is_blob_index);
if (latest_seq > upper_bound_) {
return Status::Busy("Key overwritten");
}
return s;
}
virtual bool AllowWriteBatching() override { return false; }
private:
ColumnFamilyData* cfd_;
// Key to check
Slice key_;
// Upper bound of sequence number to proceed.
SequenceNumber upper_bound_;
};
// iterate over the blobs sequentially and check if the blob sequence number
// is the latest. If it is the latest, preserve it, otherwise delete it
// if it is TTL based, and the TTL has expired, then
// we can blow the entity if the key is still the latest or the Key is not
// found
// WHAT HAPPENS IF THE KEY HAS BEEN OVERRIDEN. Then we can drop the blob
// without doing anything if the earliest snapshot is not
// referring to that sequence number, i.e. it is later than the sequence number
// of the new key
//
// if it is not TTL based, then we can blow the key if the key has been
// DELETED in the LSM
Status BlobDBImpl::GCFileAndUpdateLSM(const std::shared_ptr<BlobFile>& bfptr,
GCStats* gc_stats) {
uint64_t now = EpochNow();
std::shared_ptr<Reader> reader =
bfptr->OpenSequentialReader(env_, db_options_, env_options_);
if (!reader) {
ROCKS_LOG_ERROR(db_options_.info_log,
"File sequential reader could not be opened",
bfptr->PathName().c_str());
return Status::IOError("failed to create sequential reader");
}
BlobLogHeader header;
Status s = reader->ReadHeader(&header);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Failure to read header for blob-file %s",
bfptr->PathName().c_str());
return s;
}
bool first_gc = bfptr->gc_once_after_open_;
auto* cfh =
db_impl_->GetColumnFamilyHandleUnlocked(bfptr->column_family_id());
auto* cfd = reinterpret_cast<ColumnFamilyHandleImpl*>(cfh)->cfd();
auto column_family_id = cfd->GetID();
bool has_ttl = header.has_ttl;
// this reads the key but skips the blob
Reader::ReadLevel shallow = Reader::kReadHeaderKey;
bool no_relocation_ttl =
(has_ttl && now >= bfptr->GetExpirationRange().second);
bool no_relocation_lsmdel = false;
{
ReadLock lockbfile_r(&bfptr->mutex_);
no_relocation_lsmdel =
(bfptr->GetFileSize() ==
(BlobLogHeader::kSize + bfptr->deleted_size_ + BlobLogFooter::kSize));
}
bool no_relocation = no_relocation_ttl || no_relocation_lsmdel;
if (!no_relocation) {
// read the blob because you have to write it back to new file
shallow = Reader::kReadHeaderKeyBlob;
}
BlobLogRecord record;
std::shared_ptr<BlobFile> newfile;
std::shared_ptr<Writer> new_writer;
uint64_t blob_offset = 0;
while (true) {
assert(s.ok());
// Read the next blob record.
Status read_record_status =
reader->ReadRecord(&record, shallow, &blob_offset);
// Exit if we reach the end of blob file.
// TODO(yiwu): properly handle ReadRecord error.
if (!read_record_status.ok()) {
break;
}
gc_stats->blob_count++;
// Similar to OptimisticTransaction, we obtain latest_seq from
// base DB, which is guaranteed to be no smaller than the sequence of
// current key. We use a WriteCallback on write to check the key sequence
// on write. If the key sequence is larger than latest_seq, we know
// a new versions is inserted and the old blob can be disgard.
//
// We cannot use OptimisticTransaction because we need to pass
// is_blob_index flag to GetImpl.
SequenceNumber latest_seq = GetLatestSequenceNumber();
bool is_blob_index = false;
PinnableSlice index_entry;
Status get_status = db_impl_->GetImpl(
ReadOptions(), cfh, record.key, &index_entry, nullptr /*value_found*/,
nullptr /*read_callback*/, &is_blob_index);
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:AfterGetFromBaseDB");
if (!get_status.ok() && !get_status.IsNotFound()) {
// error
s = get_status;
ROCKS_LOG_ERROR(db_options_.info_log,
"Error while getting index entry: %s",
s.ToString().c_str());
break;
}
if (get_status.IsNotFound() || !is_blob_index) {
// Either the key is deleted or updated with a newer version whish is
// inlined in LSM.
continue;
}
BlobIndex blob_index;
s = blob_index.DecodeFrom(index_entry);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Error while decoding index entry: %s",
s.ToString().c_str());
break;
}
if (blob_index.file_number() != bfptr->BlobFileNumber() ||
blob_index.offset() != blob_offset) {
// Key has been overwritten. Drop the blob record.
continue;
}
GarbageCollectionWriteCallback callback(cfd, record.key, latest_seq);
// If key has expired, remove it from base DB.
if (no_relocation_ttl || (has_ttl && now >= record.expiration)) {
gc_stats->num_deletes++;
gc_stats->deleted_size += record.value_size;
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:BeforeDelete");
WriteBatch delete_batch;
Status delete_status = delete_batch.Delete(record.key);
if (delete_status.ok()) {
delete_status = db_impl_->WriteWithCallback(WriteOptions(),
&delete_batch, &callback);
}
if (delete_status.ok()) {
gc_stats->delete_succeeded++;
} else if (delete_status.IsBusy()) {
// The key is overwritten in the meanwhile. Drop the blob record.
gc_stats->overwritten_while_delete++;
} else {
// We hit an error.
s = delete_status;
ROCKS_LOG_ERROR(db_options_.info_log,
"Error while deleting expired key: %s",
s.ToString().c_str());
break;
}
// Continue to next blob record or retry.
continue;
}
if (first_gc) {
// Do not relocate blob record for initial GC.
continue;
}
// Relocate the blob record to new file.
if (!newfile) {
// new file
std::string reason("GC of ");
reason += bfptr->PathName();
newfile = NewBlobFile(reason);
gc_stats->newfile = newfile;
new_writer = CheckOrCreateWriterLocked(newfile);
newfile->header_ = std::move(header);
// Can't use header beyond this point
newfile->header_valid_ = true;
newfile->file_size_ = BlobLogHeader::kSize;
s = new_writer->WriteHeader(newfile->header_);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"File: %s - header writing failed",
newfile->PathName().c_str());
break;
}
WriteLock wl(&mutex_);
dir_change_.store(true);
blob_files_.insert(std::make_pair(newfile->BlobFileNumber(), newfile));
}
gc_stats->num_relocate++;
std::string new_index_entry;
uint64_t new_blob_offset = 0;
uint64_t new_key_offset = 0;
// write the blob to the blob log.
s = new_writer->AddRecord(record.key, record.value, record.expiration,
&new_key_offset, &new_blob_offset);
BlobIndex::EncodeBlob(&new_index_entry, newfile->BlobFileNumber(),
new_blob_offset, record.value.size(),
bdb_options_.compression);
newfile->blob_count_++;
newfile->file_size_ +=
BlobLogRecord::kHeaderSize + record.key.size() + record.value.size();
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:BeforeRelocate");
WriteBatch rewrite_batch;
Status rewrite_status = WriteBatchInternal::PutBlobIndex(
&rewrite_batch, column_family_id, record.key, new_index_entry);
if (rewrite_status.ok()) {
rewrite_status = db_impl_->WriteWithCallback(WriteOptions(),
&rewrite_batch, &callback);
}
if (rewrite_status.ok()) {
newfile->ExtendSequenceRange(
WriteBatchInternal::Sequence(&rewrite_batch));
gc_stats->relocate_succeeded++;
} else if (rewrite_status.IsBusy()) {
// The key is overwritten in the meanwhile. Drop the blob record.
gc_stats->overwritten_while_relocate++;
} else {
// We hit an error.
s = rewrite_status;
ROCKS_LOG_ERROR(db_options_.info_log, "Error while relocating key: %s",
s.ToString().c_str());
break;
}
} // end of ReadRecord loop
if (s.ok()) {
SequenceNumber obsolete_sequence =
newfile == nullptr ? bfptr->GetSequenceRange().second + 1
: newfile->GetSequenceRange().second;
bfptr->MarkObsolete(obsolete_sequence);
if (!first_gc) {
WriteLock wl(&mutex_);
obsolete_files_.push_back(bfptr);
}
}
ROCKS_LOG_INFO(
db_options_.info_log,
"%s blob file %" PRIu64
". Total blob records: %" PRIu64 ", Deletes: %" PRIu64 "/%" PRIu64
" succeeded, Relocates: %" PRIu64 "/%" PRIu64 " succeeded.",
s.ok() ? "Successfully garbage collected" : "Failed to garbage collect",
bfptr->BlobFileNumber(), gc_stats->blob_count, gc_stats->delete_succeeded,
gc_stats->num_deletes, gc_stats->relocate_succeeded,
gc_stats->num_relocate);
if (newfile != nullptr) {
total_blob_space_ += newfile->file_size_;
ROCKS_LOG_INFO(db_options_.info_log, "New blob file %" PRIu64 ".",
newfile->BlobFileNumber());
}
return s;
}
// Ideally we should hold the lock during the entire function,
// but under the asusmption that this is only called when a
// file is Immutable, we can reduce the critical section
bool BlobDBImpl::ShouldGCFile(std::shared_ptr<BlobFile> bfile, uint64_t now,
bool is_oldest_non_ttl_file,
std::string* reason) {
if (bfile->HasTTL()) {
ExpirationRange expiration_range = bfile->GetExpirationRange();
if (now > expiration_range.second) {
*reason = "entire file ttl expired";
return true;
}
if (!bfile->file_size_.load()) {
ROCKS_LOG_ERROR(db_options_.info_log, "Invalid file size = 0 %s",
bfile->PathName().c_str());
*reason = "file is empty";
return false;
}
if (bfile->gc_once_after_open_.load()) {
return true;
}
if (bdb_options_.ttl_range_secs < kPartialExpirationGCRangeSecs) {
*reason = "has ttl but partial expiration not turned on";
return false;
}
ReadLock lockbfile_r(&bfile->mutex_);
bool ret = ((bfile->deleted_size_ * 100.0 / bfile->file_size_.load()) >
kPartialExpirationPercentage);
if (ret) {
*reason = "deleted blobs beyond threshold";
} else {
*reason = "deleted blobs below threshold";
}
return ret;
}
// when crash happens, we lose the in-memory account of deleted blobs.
// we are therefore forced to do one GC to make sure delete accounting
// is OK
if (bfile->gc_once_after_open_.load()) {
return true;
}
ReadLock lockbfile_r(&bfile->mutex_);
if (bdb_options_.enable_garbage_collection) {
if ((bfile->deleted_size_ * 100.0 / bfile->file_size_.load()) >
kPartialExpirationPercentage) {
*reason = "deleted simple blobs beyond threshold";
return true;
}
}
// if we haven't reached limits of disk space, don't DELETE
if (bdb_options_.blob_dir_size == 0 ||
total_blob_space_.load() < bdb_options_.blob_dir_size) {
*reason = "disk space not exceeded";
return false;
}
if (is_oldest_non_ttl_file) {
*reason = "out of space and is the oldest simple blob file";
return true;
}
*reason = "out of space but is not the oldest simple blob file";
return false;
}
std::pair<bool, int64_t> BlobDBImpl::DeleteObsoleteFiles(bool aborted) {
if (aborted) return std::make_pair(false, -1);
{
ReadLock rl(&mutex_);
if (obsolete_files_.empty()) return std::make_pair(true, -1);
}
std::list<std::shared_ptr<BlobFile>> tobsolete;
{
WriteLock wl(&mutex_);
tobsolete.swap(obsolete_files_);
}
bool file_deleted = false;
for (auto iter = tobsolete.begin(); iter != tobsolete.end();) {
auto bfile = *iter;
{
ReadLock lockbfile_r(&bfile->mutex_);
if (VisibleToActiveSnapshot(bfile)) {
ROCKS_LOG_INFO(db_options_.info_log,
"Could not delete file due to snapshot failure %s",
bfile->PathName().c_str());
++iter;
continue;
}
}
ROCKS_LOG_INFO(db_options_.info_log,
"Will delete file due to snapshot success %s",
bfile->PathName().c_str());
blob_files_.erase(bfile->BlobFileNumber());
Status s = env_->DeleteFile(bfile->PathName());
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"File failed to be deleted as obsolete %s",
bfile->PathName().c_str());
++iter;
continue;
}
file_deleted = true;
total_blob_space_ -= bfile->file_size_;
ROCKS_LOG_INFO(db_options_.info_log,
"File deleted as obsolete from blob dir %s",
bfile->PathName().c_str());
iter = tobsolete.erase(iter);
}
// directory change. Fsync
if (file_deleted) {
dir_ent_->Fsync();
// reset oldest_file_evicted flag
oldest_file_evicted_.store(false);
}
// put files back into obsolete if for some reason, delete failed
if (!tobsolete.empty()) {
WriteLock wl(&mutex_);
for (auto bfile : tobsolete) {
obsolete_files_.push_front(bfile);
}
}
return std::make_pair(!aborted, -1);
}
void BlobDBImpl::CopyBlobFiles(
std::vector<std::shared_ptr<BlobFile>>* bfiles_copy,
std::function<bool(const std::shared_ptr<BlobFile>&)> predicate) {
ReadLock rl(&mutex_);
for (auto const& p : blob_files_) {
bool pred_value = true;
if (predicate) {
pred_value = predicate(p.second);
}
if (pred_value) {
bfiles_copy->push_back(p.second);
}
}
}
void BlobDBImpl::FilterSubsetOfFiles(
const std::vector<std::shared_ptr<BlobFile>>& blob_files,
std::vector<std::shared_ptr<BlobFile>>* to_process, uint64_t epoch,
size_t files_to_collect) {
// 100.0 / 15.0 = 7
uint64_t next_epoch_increment = static_cast<uint64_t>(
std::ceil(100 / static_cast<double>(kGCFilePercentage)));
uint64_t now = EpochNow();
size_t files_processed = 0;
bool non_ttl_file_found = false;
for (auto bfile : blob_files) {
if (files_processed >= files_to_collect) break;
// if this is the first time processing the file
// i.e. gc_epoch == -1, process it.
// else process the file if its processing epoch matches
// the current epoch. Typically the #of epochs should be
// around 5-10
if (bfile->gc_epoch_ != -1 && (uint64_t)bfile->gc_epoch_ != epoch) {
continue;
}
files_processed++;
// reset the epoch
bfile->gc_epoch_ = epoch + next_epoch_increment;
// file has already been GC'd or is still open for append,
// then it should not be GC'd
if (bfile->Obsolete() || !bfile->Immutable()) continue;
bool is_oldest_non_ttl_file = false;
if (!non_ttl_file_found && !bfile->HasTTL()) {
is_oldest_non_ttl_file = true;
non_ttl_file_found = true;
}
std::string reason;
bool shouldgc = ShouldGCFile(bfile, now, is_oldest_non_ttl_file, &reason);
if (!shouldgc) {
ROCKS_LOG_DEBUG(db_options_.info_log,
"File has been skipped for GC ttl %s %" PRIu64 " %" PRIu64
" reason='%s'",
bfile->PathName().c_str(), now,
bfile->GetExpirationRange().second, reason.c_str());
continue;
}
ROCKS_LOG_INFO(db_options_.info_log,
"File has been chosen for GC ttl %s %" PRIu64 " %" PRIu64
" reason='%s'",
bfile->PathName().c_str(), now,
bfile->GetExpirationRange().second, reason.c_str());
to_process->push_back(bfile);
}
}
std::pair<bool, int64_t> BlobDBImpl::RunGC(bool aborted) {
if (aborted) return std::make_pair(false, -1);
current_epoch_++;
std::vector<std::shared_ptr<BlobFile>> blob_files;
CopyBlobFiles(&blob_files);
if (!blob_files.size()) return std::make_pair(true, -1);
// 15% of files are collected each call to space out the IO and CPU
// consumption.
size_t files_to_collect = (kGCFilePercentage * blob_files.size()) / 100;
std::vector<std::shared_ptr<BlobFile>> to_process;
FilterSubsetOfFiles(blob_files, &to_process, current_epoch_,
files_to_collect);
for (auto bfile : to_process) {
GCStats gc_stats;
Status s = GCFileAndUpdateLSM(bfile, &gc_stats);
if (!s.ok()) {
continue;
}
if (bfile->gc_once_after_open_.load()) {
WriteLock lockbfile_w(&bfile->mutex_);
bfile->deleted_size_ = gc_stats.deleted_size;
bfile->deleted_count_ = gc_stats.num_deletes;
bfile->gc_once_after_open_ = false;
}
}
// reschedule
return std::make_pair(true, -1);
}
Iterator* BlobDBImpl::NewIterator(const ReadOptions& read_options) {
auto* cfd =
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->cfd();
// Get a snapshot to avoid blob file get deleted between we
// fetch and index entry and reading from the file.
ManagedSnapshot* own_snapshot = nullptr;
const Snapshot* snapshot = read_options.snapshot;
if (snapshot == nullptr) {
own_snapshot = new ManagedSnapshot(db_);
snapshot = own_snapshot->snapshot();
}
auto* iter = db_impl_->NewIteratorImpl(
read_options, cfd, snapshot->GetSequenceNumber(),
nullptr /*read_callback*/, true /*allow_blob*/);
return new BlobDBIterator(own_snapshot, iter, this);
}
Status DestroyBlobDB(const std::string& dbname, const Options& options,
const BlobDBOptions& bdb_options) {
const ImmutableDBOptions soptions(SanitizeOptions(dbname, options));
Env* env = soptions.env;
Status status;
std::string blobdir;
blobdir = (bdb_options.path_relative) ? dbname + "/" + bdb_options.blob_dir
: bdb_options.blob_dir;
std::vector<std::string> filenames;
env->GetChildren(blobdir, &filenames);
for (const auto& f : filenames) {
uint64_t number;
FileType type;
if (ParseFileName(f, &number, &type) && type == kBlobFile) {
Status del = env->DeleteFile(blobdir + "/" + f);
if (status.ok() && !del.ok()) {
status = del;
}
}
}
env->DeleteDir(blobdir);
Status destroy = DestroyDB(dbname, options);
if (status.ok() && !destroy.ok()) {
status = destroy;
}
return status;
}
#ifndef NDEBUG
Status BlobDBImpl::TEST_GetBlobValue(const Slice& key, const Slice& index_entry,
PinnableSlice* value) {
return GetBlobValue(key, index_entry, value);
}
std::vector<std::shared_ptr<BlobFile>> BlobDBImpl::TEST_GetBlobFiles() const {
ReadLock l(&mutex_);
std::vector<std::shared_ptr<BlobFile>> blob_files;
for (auto& p : blob_files_) {
blob_files.emplace_back(p.second);
}
return blob_files;
}
std::vector<std::shared_ptr<BlobFile>> BlobDBImpl::TEST_GetObsoleteFiles()
const {
ReadLock l(&mutex_);
std::vector<std::shared_ptr<BlobFile>> obsolete_files;
for (auto& bfile : obsolete_files_) {
obsolete_files.emplace_back(bfile);
}
return obsolete_files;
}
void BlobDBImpl::TEST_DeleteObsoleteFiles() {
DeleteObsoleteFiles(false /*abort*/);
}
Status BlobDBImpl::TEST_CloseBlobFile(std::shared_ptr<BlobFile>& bfile) {
return CloseBlobFile(bfile);
}
Status BlobDBImpl::TEST_GCFileAndUpdateLSM(std::shared_ptr<BlobFile>& bfile,
GCStats* gc_stats) {
return GCFileAndUpdateLSM(bfile, gc_stats);
}
void BlobDBImpl::TEST_RunGC() { RunGC(false /*abort*/); }
#endif // !NDEBUG
} // namespace blob_db
} // namespace rocksdb
#endif // ROCKSDB_LITE
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