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0552029b5c
rocksdb/utilities/blob_db/blob_db_impl.cc
Yi Wu 0552029b5c Blob DB: not writing sequence number as blob record footer 
Summary:
Previously each time we write a blob we write blog_record_header + key + value + blob_record_footer to blob log. The footer only contains a sequence and a crc for the sequence number. The sequence number was used in garbage collection to verify the value is recent. After #2703 we moved to use optimistic transaction and no longer use sequence number from the footer. Remove the footer altogether.

There's another usage of sequence number and we are keeping it: Each blob log file keep track of sequence number range of keys in it, and use it to check if it is reference by a snapshot, before being deleted.
Closes https://github.com/facebook/rocksdb/pull/3005

Differential Revision: D6057585

Pulled By: yiwu-arbug

fbshipit-source-id: d6da53c457a316e9723f359a1b47facfc3ffe090
2017-10-17 12:13:08 -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).
#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/transactions/optimistic_transaction.h"
#include "utilities/transactions/optimistic_transaction_db_impl.h"
namespace {
int kBlockBasedTableVersionFormat = 2;
void extendTTL(rocksdb::blob_db::ttlrange_t* ttl_range, uint64_t ttl) {
ttl_range->first = std::min(ttl_range->first, ttl);
ttl_range->second = std::max(ttl_range->second, ttl);
}
void extendTimestamps(rocksdb::blob_db::tsrange_t* ts_range, uint64_t ts) {
ts_range->first = std::min(ts_range->first, ts);
ts_range->second = std::max(ts_range->second, ts);
}
} // end namespace
namespace rocksdb {
namespace blob_db {
// BlobHandle is a pointer to the blob that is stored in the LSM
class BlobHandle {
public:
BlobHandle()
: file_number_(std::numeric_limits<uint64_t>::max()),
offset_(std::numeric_limits<uint64_t>::max()),
size_(std::numeric_limits<uint64_t>::max()),
compression_(kNoCompression) {}
uint64_t filenumber() const { return file_number_; }
void set_filenumber(uint64_t fn) { file_number_ = fn; }
// The offset of the block in the file.
uint64_t offset() const { return offset_; }
void set_offset(uint64_t _offset) { offset_ = _offset; }
// The size of the stored block
uint64_t size() const { return size_; }
void set_size(uint64_t _size) { size_ = _size; }
CompressionType compression() const { return compression_; }
void set_compression(CompressionType t) { compression_ = t; }
void EncodeTo(std::string* dst) const;
Status DecodeFrom(Slice* input);
void clear();
private:
uint64_t file_number_;
uint64_t offset_;
uint64_t size_;
CompressionType compression_;
};
void BlobHandle::EncodeTo(std::string* dst) const {
// Sanity check that all fields have been set
assert(offset_ != std::numeric_limits<uint64_t>::max());
assert(size_ != std::numeric_limits<uint64_t>::max());
assert(file_number_ != std::numeric_limits<uint64_t>::max());
dst->reserve(30);
PutVarint64(dst, file_number_);
PutVarint64(dst, offset_);
PutVarint64(dst, size_);
dst->push_back(static_cast<unsigned char>(compression_));
}
void BlobHandle::clear() {
file_number_ = std::numeric_limits<uint64_t>::max();
offset_ = std::numeric_limits<uint64_t>::max();
size_ = std::numeric_limits<uint64_t>::max();
compression_ = kNoCompression;
}
Status BlobHandle::DecodeFrom(Slice* input) {
if (GetVarint64(input, &file_number_) && GetVarint64(input, &offset_) &&
GetVarint64(input, &size_)) {
compression_ = static_cast<CompressionType>(input->data()[0]);
return Status::OK();
} else {
clear();
return Status::Corruption("bad blob handle");
}
}
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->ttl_range_.first < rhs->ttl_range_.first) return true;
if (lhs->ttl_range_.first > rhs->ttl_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) {
if (!is_new &&
value_type ==
CompactionEventListener::CompactionListenerValueType::kValue) {
BlobHandle handle;
Slice lsmval(existing_value);
Status s = handle.DecodeFrom(&lsmval);
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, handle.filenumber(),
handle.offset(), handle.size());
impl_->override_vals_q_.enqueue({handle.filenumber(), key.size(),
handle.offset(), handle.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()),
wo_set_(false),
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) {
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();
opt_db_.reset(new OptimisticTransactionDBImpl(db, false));
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)),
opt_db_(new OptimisticTransactionDBImpl(db, false)),
wo_set_(false),
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) {
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));
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->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
ttlrange_t ttl_range(std::numeric_limits<uint32_t>::max(),
std::numeric_limits<uint32_t>::min());
tsrange_t ts_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()) {
extendTTL(&ttl_range, record.GetTTL());
}
if (bfptr->HasTimestamp()) {
extendTimestamps(&ts_range, record.GetTimeVal());
}
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->SetSNRange({0, 0});
if (bfptr->HasTimestamp()) bfptr->set_time_range(ts_range);
ROCKS_LOG_INFO(db_options_.info_log,
"Blob File: %s blob_count: %" PRIu64
" size_bytes: %" PRIu64 " ts: %d ttl: %d",
bfpath.c_str(), blob_count, size_bytes,
bfptr->HasTimestamp(), bfptr->HasTTL());
if (bfptr->HasTTL()) {
ttl_range.second =
std::max(ttl_range.second,
ttl_range.first + (uint32_t)bdb_options_.ttl_range_secs);
bfptr->set_ttl_range(ttl_range);
uint64_t now = EpochNow();
if (ttl_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 ttl_range: (%d, %d)",
bfpath.c_str(), now, ttl_range.first,
ttl_range.second);
}
} else {
open_blob_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::kHeaderSize) {
et = Writer::kEtFileHdr;
} else if (bfile->file_size_ > BlobLogHeader::kHeaderSize) {
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_blob_files_.empty()) return nullptr;
std::shared_ptr<BlobFile> tmp = std::make_shared<BlobFile>();
tmp->ttl_range_ = std::make_pair(expiration, 0);
auto citr = open_blob_files_.equal_range(tmp);
if (citr.first == open_blob_files_.end()) {
assert(citr.second == open_blob_files_.end());
std::shared_ptr<BlobFile> check = *(open_blob_files_.rbegin());
return (check->ttl_range_.second < expiration) ? nullptr : check;
}
if (citr.first != citr.second) return *(citr.first);
auto finditr = citr.second;
if (finditr != open_blob_files_.begin()) --finditr;
bool b2 = (*finditr)->ttl_range_.second < expiration;
bool b1 = (*finditr)->ttl_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;
}
void BlobDBImpl::UpdateWriteOptions(const WriteOptions& options) {
if (!wo_set_.load(std::memory_order_relaxed)) {
// DCLP
WriteLock wl(&mutex_);
if (!wo_set_.load(std::memory_order_acquire)) {
wo_set_.store(true, std::memory_order_release);
write_options_ = options;
}
}
}
std::shared_ptr<BlobFile> BlobDBImpl::SelectBlobFile() {
uint32_t val = blob_rgen.Next();
{
ReadLock rl(&mutex_);
if (open_simple_files_.size() == bdb_options_.num_concurrent_simple_blobs)
return open_simple_files_[val % bdb_options_.num_concurrent_simple_blobs];
}
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::kHeaderSize;
bfile->header_.compression_ = bdb_options_.compression;
bfile->header_valid_ = true;
// CHECK again
WriteLock wl(&mutex_);
if (open_simple_files_.size() == bdb_options_.num_concurrent_simple_blobs) {
return open_simple_files_[val % bdb_options_.num_concurrent_simple_blobs];
}
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_simple_files_.push_back(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;
ttlrange_t ttl_guess = 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_.set_ttl_guess(ttl_guess);
bfile->header_.compression_ = bdb_options_.compression;
bfile->header_valid_ = true;
bfile->file_size_ = BlobLogHeader::kHeaderSize;
// set the first value of the range, since that is
// concrete at this time. also necessary to add to open_blob_files_
bfile->ttl_range_ = ttl_guess;
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_blob_files_.insert(bfile);
epoch_of_++;
return bfile;
}
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::Delete(const WriteOptions& options, const Slice& key) {
SequenceNumber lsn = db_impl_->GetLatestSequenceNumber();
Status s = db_->Delete(options, key);
// add deleted key to list of keys that have been deleted for book-keeping
delete_keys_q_.enqueue({DefaultColumnFamily(), key.ToString(), lsn});
return s;
}
Status BlobDBImpl::Write(const WriteOptions& opts, WriteBatch* updates) {
class BlobInserter : public WriteBatch::Handler {
private:
BlobDBImpl* impl_;
SequenceNumber sequence_;
WriteBatch updates_blob_;
std::shared_ptr<BlobFile> last_file_;
bool has_put_;
std::string new_value_;
uint32_t default_cf_id_;
public:
BlobInserter(BlobDBImpl* impl, SequenceNumber seq)
: impl_(impl),
sequence_(seq),
has_put_(false),
default_cf_id_(reinterpret_cast<ColumnFamilyHandleImpl*>(
impl_->DefaultColumnFamily())
->cfd()
->GetID()) {}
SequenceNumber sequence() { return sequence_; }
WriteBatch* updates_blob() { return &updates_blob_; }
std::shared_ptr<BlobFile>& last_file() { return last_file_; }
bool has_put() { return has_put_; }
virtual Status PutCF(uint32_t column_family_id, const Slice& key,
const Slice& value_slice) override {
if (column_family_id != default_cf_id_) {
return Status::NotSupported(
"Blob DB doesn't support non-default column family.");
}
Slice value_unc;
uint64_t expiration =
impl_->ExtractExpiration(key, value_slice, &value_unc, &new_value_);
std::shared_ptr<BlobFile> bfile =
(expiration != kNoExpiration)
? impl_->SelectBlobFileTTL(expiration)
: ((last_file_) ? last_file_ : impl_->SelectBlobFile());
if (last_file_ && last_file_ != bfile) {
return Status::NotFound("too many blob files");
}
if (!bfile) {
return Status::NotFound("blob file not found");
}
last_file_ = bfile;
has_put_ = true;
std::string compression_output;
Slice value = impl_->GetCompressedSlice(value_unc, &compression_output);
std::string headerbuf;
Writer::ConstructBlobHeader(&headerbuf, key, value, expiration, -1);
std::string index_entry;
Status s = impl_->AppendBlob(bfile, headerbuf, key, value, &index_entry);
if (!s.ok()) {
return s;
}
bfile->ExtendSequenceRange(sequence_);
sequence_++;
if (expiration != kNoExpiration) {
extendTTL(&(bfile->ttl_range_), expiration);
}
return WriteBatchInternal::Put(&updates_blob_, column_family_id, key,
index_entry);
}
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.");
}
WriteBatchInternal::Delete(&updates_blob_, column_family_id, key);
sequence_++;
return Status::OK();
}
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.");
}
WriteBatchInternal::DeleteRange(&updates_blob_, column_family_id,
begin_key, end_key);
sequence_++;
return Status::OK();
}
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 {
updates_blob_.PutLogData(blob);
}
};
MutexLock l(&write_mutex_);
SequenceNumber current_seq = db_impl_->GetLatestSequenceNumber() + 1;
BlobInserter blob_inserter(this, current_seq);
Status s = updates->Iterate(&blob_inserter);
if (!s.ok()) {
return s;
}
s = db_->Write(opts, blob_inserter.updates_blob());
if (!s.ok()) {
return s;
}
assert(current_seq ==
WriteBatchInternal::Sequence(blob_inserter.updates_blob()));
assert(blob_inserter.sequence() ==
current_seq + WriteBatchInternal::Count(blob_inserter.updates_blob()));
if (blob_inserter.has_put()) {
s = CloseBlobFileIfNeeded(blob_inserter.last_file());
if (!s.ok()) {
return s;
}
}
// 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_;
};
// add deleted key to list of keys that have been deleted for book-keeping
DeleteBookkeeper delete_bookkeeper(this, current_seq);
updates->Iterate(&delete_bookkeeper);
return Status::OK();
}
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::PutWithTTL(const WriteOptions& options,
const Slice& key, const Slice& value,
uint64_t ttl) {
uint64_t now = EpochNow();
assert(std::numeric_limits<uint64_t>::max() - now > ttl);
return PutUntil(options, key, value, now + ttl);
}
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;
}
Status BlobDBImpl::PutUntil(const WriteOptions& options, const Slice& key,
const Slice& value_unc, uint64_t expiration) {
TEST_SYNC_POINT("BlobDBImpl::PutUntil:Start");
MutexLock l(&write_mutex_);
UpdateWriteOptions(options);
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 = GetCompressedSlice(value_unc, &compression_output);
std::string headerbuf;
Writer::ConstructBlobHeader(&headerbuf, key, value, expiration, -1);
// this is another more safer way to do it, where you keep the writeLock
// for the entire write path. this will increase latency and reduce
// throughput
// WriteLock lockbfile_w(&bfile->mutex_);
// std::shared_ptr<Writer> writer =
// CheckOrCreateWriterLocked(bfile);
if (debug_level_ >= 3)
ROCKS_LOG_DEBUG(
db_options_.info_log, ">Adding KEY FILE: %s: KEY: %s VALSZ: %d",
bfile->PathName().c_str(), key.ToString().c_str(), value.size());
std::string index_entry;
Status s = AppendBlob(bfile, headerbuf, key, value, &index_entry);
if (!s.ok()) {
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;
}
WriteBatch batch;
batch.Put(key, index_entry);
// this goes to the base db and can be expensive
s = db_->Write(options, &batch);
// this is the sequence number of the write.
SequenceNumber sn = WriteBatchInternal::Sequence(&batch);
bfile->ExtendSequenceRange(sn);
if (expiration != kNoExpiration) {
extendTTL(&(bfile->ttl_range_), expiration);
}
if (s.ok()) {
s = CloseBlobFileIfNeeded(bfile);
}
TEST_SYNC_POINT("BlobDBImpl::PutUntil:Finish");
return s;
}
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;
}
Status BlobDBImpl::AppendBlob(const std::shared_ptr<BlobFile>& bfile,
const std::string& headerbuf, const Slice& key,
const Slice& value, std::string* index_entry) {
Status 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_++;
auto size_put = BlobLogRecord::kHeaderSize + key.size() + value.size();
bfile->file_size_ += size_put;
last_period_write_ += size_put;
total_blob_space_ += size_put;
BlobHandle handle;
handle.set_filenumber(bfile->BlobFileNumber());
handle.set_size(value.size());
handle.set_offset(blob_offset);
handle.set_compression(bdb_options_.compression);
handle.EncodeTo(index_entry);
if (debug_level_ >= 3)
ROCKS_LOG_INFO(db_options_.info_log,
">Adding KEY FILE: %s: BC: %d OFFSET: %d SZ: %d",
bfile->PathName().c_str(), bfile->blob_count_.load(),
blob_offset, value.size());
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<std::string> values_lsm;
values_lsm.resize(keys.size());
auto statuses = db_->MultiGet(ro, keys, &values_lsm);
TEST_SYNC_POINT("BlobDBImpl::MultiGet:AfterIndexEntryGet:1");
TEST_SYNC_POINT("BlobDBImpl::MultiGet:AfterIndexEntryGet:2");
values->resize(keys.size());
assert(statuses.size() == keys.size());
assert(values_lsm.size() == keys.size());
for (size_t i = 0; i < keys.size(); ++i) {
if (!statuses[i].ok()) {
continue;
}
Status s = CommonGet(keys[i], values_lsm[i], &((*values)[i]));
statuses[i] = s;
}
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::CommonGet(const Slice& key, const std::string& index_entry,
std::string* value) {
assert(value != nullptr);
Slice index_entry_slice(index_entry);
BlobHandle handle;
Status s = handle.DecodeFrom(&index_entry_slice);
if (!s.ok()) return s;
// 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 (handle.offset() <
(BlobLogHeader::kHeaderSize + BlobLogRecord::kHeaderSize + key.size())) {
if (debug_level_ >= 2) {
ROCKS_LOG_ERROR(
db_options_.info_log,
"Invalid blob handle file_number: %" PRIu64 " blob_offset: %" PRIu64
" blob_size: %" PRIu64 " key: %s",
handle.filenumber(), handle.offset(), handle.size(), key.data());
}
return Status::NotFound("Blob Not Found, although found in LSM");
}
std::shared_ptr<BlobFile> bfile;
{
ReadLock rl(&mutex_);
auto hitr = blob_files_.find(handle.filenumber());
// file was deleted
if (hitr == blob_files_.end()) {
return Status::NotFound("Blob Not Found as blob file missing");
}
bfile = hitr->second;
}
// 0 - size
if (!handle.size() && value != nullptr) {
value->clear();
return Status::OK();
}
// takes locks when called
std::shared_ptr<RandomAccessFileReader> reader =
GetOrOpenRandomAccessReader(bfile, env_, env_options_);
std::string* valueptr = value;
std::string value_c;
if (bdb_options_.compression != kNoCompression) {
valueptr = &value_c;
}
// allocate the buffer. This is safe in C++11
valueptr->resize(handle.size());
char* buffer = &(*valueptr)[0];
Slice blob_value;
s = reader->Read(handle.offset(), handle.size(), &blob_value, buffer);
if (!s.ok() || blob_value.size() != handle.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(), handle.offset(), handle.size(),
static_cast<int>(blob_value.size()), key.data(),
s.ToString().c_str());
}
return Status::NotFound("Blob Not Found as couldnt retrieve Blob");
}
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(handle.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(), handle.offset(), handle.size(),
key.data(), s.ToString().c_str());
}
return Status::NotFound("Blob Not Found as couldnt retrieve CRC");
}
uint32_t crc = crc32c::Extend(0, 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(), handle.offset(), handle.size(),
key.data(), s.ToString().c_str());
}
return Status::Corruption("Corruption. Blob CRC mismatch");
}
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 = contents.data.ToString();
}
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;
std::string index_entry;
s = db_->Get(ro, key, &index_entry);
TEST_SYNC_POINT("BlobDBImpl::Get:AfterIndexEntryGet:1");
TEST_SYNC_POINT("BlobDBImpl::Get:AfterIndexEntryGet:2");
if (s.ok()) {
s = CommonGet(key, index_entry, value->GetSelf());
value->PinSelf();
}
if (snapshot_created) {
db_->ReleaseSnapshot(ro.snapshot);
}
return s;
}
Slice BlobDBIterator::value() const {
TEST_SYNC_POINT("BlobDBIterator::value:BeforeGetBlob:1");
TEST_SYNC_POINT("BlobDBIterator::value:BeforeGetBlob:2");
Slice index_entry = iter_->value();
Status s =
db_impl_->CommonGet(iter_->key(), index_entry.ToString(false), &vpart_);
return Slice(vpart_);
}
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_blob_files_.size());
for (auto bfile : open_blob_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->ttl_range_.second - epoch_now));
}
// reschedule
return std::make_pair(true, -1);
}
Status BlobDBImpl::CloseBlobFile(std::shared_ptr<BlobFile> bfile) {
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__)) = open_blob_files_.erase(bfile);
assert(erased == 1);
} else {
auto iter = std::find(open_simple_files_.begin(),
open_simple_files_.end(), bfile);
assert(iter != open_simple_files_.end());
open_simple_files_.erase(iter);
}
}
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::FileDeleteOk_SnapshotCheckLocked(
const std::shared_ptr<BlobFile>& bfile) {
assert(bfile->Obsolete());
SequenceNumber esn = bfile->GetSNRange().first;
// this is not correct.
// you want to check that there are no snapshots in the
bool notok = db_impl_->HasActiveSnapshotLaterThanSN(esn);
if (notok) {
ROCKS_LOG_INFO(db_options_.info_log,
"Could not delete file due to snapshot failure %s",
bfile->PathName().c_str());
return false;
} else {
ROCKS_LOG_INFO(db_options_.info_log,
"Will delete file due to snapshot success %s",
bfile->PathName().c_str());
return true;
}
}
bool BlobDBImpl::FindFileAndEvictABlob(uint64_t file_number, uint64_t key_size,
uint64_t blob_offset,
uint64_t blob_size) {
(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& lsmValue) {
Slice val(lsmValue);
BlobHandle handle;
Status s = handle.DecodeFrom(&val);
if (!s.ok()) {
ROCKS_LOG_INFO(db_options_.info_log,
"Could not parse lsm val in MarkBlobDeleted %s",
lsmValue.ToString().c_str());
return false;
}
bool succ = FindFileAndEvictABlob(handle.filenumber(), key.size(),
handle.offset(), handle.size());
return succ;
}
std::pair<bool, int64_t> BlobDBImpl::EvictCompacted(bool aborted) {
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) {
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_blob_files_) {
{
ReadLock lockbfile_r(&bfile->mutex_);
if (bfile->ttl_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_blob_files_) {
if (fitr->NeedsFsync(true, bdb_options_.bytes_per_sync))
process_files.push_back(fitr);
}
for (auto fitr : open_simple_files_) {
if (fitr->NeedsFsync(true, bdb_options_.bytes_per_sync))
process_files.push_back(fitr);
}
}
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);
}
////////////////////////////////////////////////////////////////////////////////
// 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_;
ColumnFamilyHandle* cfh = bfptr->GetColumnFamily(db_);
bool has_ttl = header.HasTTL();
// this reads the key but skips the blob
Reader::ReadLevel shallow = Reader::kReadHeaderKey;
assert(opt_db_);
bool no_relocation_ttl = (has_ttl && now >= bfptr->GetTTLRange().second);
bool no_relocation_lsmdel = false;
{
ReadLock lockbfile_r(&bfptr->mutex_);
no_relocation_lsmdel = (bfptr->GetFileSize() ==
(BlobLogHeader::kHeaderSize + bfptr->deleted_size_ +
BlobLogFooter::kFooterSize));
}
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;
Transaction* transaction = nullptr;
uint64_t blob_offset = 0;
bool retry = false;
static const WriteOptions kGarbageCollectionWriteOptions = []() {
WriteOptions write_options;
// It is ok to ignore column families that were dropped.
write_options.ignore_missing_column_families = true;
return write_options;
}();
while (true) {
assert(s.ok());
if (retry) {
// Retry in case transaction fail with Status::TryAgain.
retry = false;
} else {
// 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++;
}
transaction =
opt_db_->BeginTransaction(kGarbageCollectionWriteOptions,
OptimisticTransactionOptions(), transaction);
std::string index_entry;
Status get_status = transaction->GetForUpdate(ReadOptions(), cfh,
record.Key(), &index_entry);
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:AfterGetForUpdate");
if (get_status.IsNotFound()) {
// Key has been deleted. Drop the blob record.
continue;
}
if (!get_status.ok()) {
s = get_status;
ROCKS_LOG_ERROR(db_options_.info_log,
"Error while getting index entry: %s",
s.ToString().c_str());
break;
}
// TODO(yiwu): We should have an override of GetForUpdate returning a
// PinnableSlice.
Slice index_entry_slice(index_entry);
BlobHandle handle;
s = handle.DecodeFrom(&index_entry_slice);
if (!s.ok()) {
ROCKS_LOG_ERROR(db_options_.info_log,
"Error while decoding index entry: %s",
s.ToString().c_str());
break;
}
if (handle.filenumber() != bfptr->BlobFileNumber() ||
handle.offset() != blob_offset) {
// Key has been overwritten. Drop the blob record.
continue;
}
// If key has expired, remove it from base DB.
if (no_relocation_ttl || (has_ttl && now >= record.GetTTL())) {
gc_stats->num_deletes++;
gc_stats->deleted_size += record.GetBlobSize();
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:BeforeDelete");
transaction->Delete(cfh, record.Key());
Status delete_status = transaction->Commit();
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 if (delete_status.IsTryAgain()) {
// Retry the transaction.
retry = true;
} 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::kHeaderSize;
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.Blob(), &new_key_offset,
&new_blob_offset, record.GetTTL());
BlobHandle new_handle;
new_handle.set_filenumber(newfile->BlobFileNumber());
new_handle.set_size(record.Blob().size());
new_handle.set_offset(new_blob_offset);
new_handle.set_compression(bdb_options_.compression);
new_handle.EncodeTo(&new_index_entry);
newfile->blob_count_++;
newfile->file_size_ +=
BlobLogRecord::kHeaderSize + record.Key().size() + record.Blob().size();
TEST_SYNC_POINT("BlobDBImpl::GCFileAndUpdateLSM:BeforeRelocate");
transaction->Put(cfh, record.Key(), new_index_entry);
Status put_status = transaction->Commit();
if (put_status.ok()) {
gc_stats->relocate_succeeded++;
} else if (put_status.IsBusy()) {
// The key is overwritten in the meanwhile. Drop the blob record.
gc_stats->overwritten_while_relocate++;
} else if (put_status.IsTryAgain()) {
// Retry the transaction.
// TODO(yiwu): On retry, we can reuse the new blob record.
retry = true;
} else {
// We hit an error.
s = put_status;
ROCKS_LOG_ERROR(db_options_.info_log, "Error while relocating key: %s",
s.ToString().c_str());
break;
}
} // end of ReadRecord loop
if (transaction != nullptr) {
delete transaction;
}
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_simple_blob_file,
std::string* reason) {
if (bfile->HasTTL()) {
ttlrange_t ttl_range = bfile->GetTTLRange();
if (now > ttl_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 ((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_simple_blob_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 (!FileDeleteOk_SnapshotCheckLocked(bfile)) {
++iter;
continue;
}
}
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();
// 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);
}
bool BlobDBImpl::CallbackEvictsImpl(std::shared_ptr<BlobFile> bfile) {
std::shared_ptr<Reader> reader =
bfile->OpenSequentialReader(env_, db_options_, env_options_);
if (!reader) {
ROCKS_LOG_ERROR(
db_options_.info_log,
"File sequential reader could not be opened for evict callback: %s",
bfile->PathName().c_str());
return false;
}
ReadLock lockbfile_r(&bfile->mutex_);
BlobLogHeader header;
Status s = reader->ReadHeader(&header);
if (!s.ok()) {
ROCKS_LOG_ERROR(
db_options_.info_log,
"Failure to read header for blob-file during evict callback %s",
bfile->PathName().c_str());
return false;
}
ColumnFamilyHandle* cfh = bfile->GetColumnFamily(db_);
BlobLogRecord record;
Reader::ReadLevel full = Reader::kReadHeaderKeyBlob;
while (reader->ReadRecord(&record, full).ok()) {
bdb_options_.gc_evict_cb_fn(cfh, record.Key(), record.Blob());
}
return true;
}
std::pair<bool, int64_t> BlobDBImpl::RemoveTimerQ(TimerQueue* tq,
bool aborted) {
WriteLock wl(&mutex_);
for (auto itr = cb_threads_.begin(); itr != cb_threads_.end(); ++itr) {
if ((*itr).get() != tq) continue;
cb_threads_.erase(itr);
break;
}
return std::make_pair(false, -1);
}
std::pair<bool, int64_t> BlobDBImpl::CallbackEvicts(
TimerQueue* tq, std::shared_ptr<BlobFile> bfile, bool aborted) {
if (aborted) return std::make_pair(false, -1);
bool succ = CallbackEvictsImpl(bfile);
if (succ) {
ROCKS_LOG_DEBUG(db_options_.info_log, "Eviction callbacks completed %s",
bfile->PathName().c_str());
}
WriteLock wl(&mutex_);
bfile->SetCanBeDeleted();
obsolete_files_.push_front(bfile);
if (tq) {
// all of the callbacks have been processed
tqueue_.add(0, std::bind(&BlobDBImpl::RemoveTimerQ, this, tq,
std::placeholders::_1));
}
return std::make_pair(false, -1);
}
void BlobDBImpl::CopyBlobFiles(
std::vector<std::shared_ptr<BlobFile>>* bfiles_copy) {
ReadLock rl(&mutex_);
// take a copy
bfiles_copy->reserve(blob_files_.size());
for (auto const& p : blob_files_) {
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 simple_blob_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_simple_blob_file = false;
if (!simple_blob_file_found && !bfile->HasTTL()) {
is_oldest_simple_blob_file = true;
simple_blob_file_found = true;
}
std::string reason;
bool shouldgc =
ShouldGCFile(bfile, now, is_oldest_simple_blob_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->GetTTLRange().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->GetTTLRange().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);
// in this collect the set of files, which became obsolete
std::vector<std::shared_ptr<BlobFile>> obsoletes;
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;
} else {
obsoletes.push_back(bfile);
}
}
if (!obsoletes.empty()) {
bool evict_cb = (!!bdb_options_.gc_evict_cb_fn);
std::shared_ptr<TimerQueue> tq;
if (evict_cb) tq = std::make_shared<TimerQueue>();
// if evict callback is present, first schedule the callback thread
WriteLock wl(&mutex_);
for (auto bfile : obsoletes) {
bool last_file = (bfile == obsoletes.back());
if (!evict_cb) {
bfile->SetCanBeDeleted();
obsolete_files_.push_front(bfile);
} else {
tq->add(0, std::bind(&BlobDBImpl::CallbackEvicts, this,
(last_file) ? tq.get() : nullptr, bfile,
std::placeholders::_1));
}
}
if (evict_cb) cb_threads_.emplace_back(tq);
}
// reschedule
return std::make_pair(true, -1);
}
Iterator* BlobDBImpl::NewIterator(const ReadOptions& read_options) {
// 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);
return new BlobDBIterator(db_->NewIterator(ro), this, snapshot_created,
ro.snapshot);
}
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
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*/); }
void BlobDBImpl::TEST_ObsoleteFile(std::shared_ptr<BlobFile>& bfile) {
uint64_t number = bfile->BlobFileNumber();
assert(blob_files_.count(number) > 0);
bfile->SetCanBeDeleted();
{
WriteLock l(&mutex_);
obsolete_files_.push_back(bfile);
}
}
#endif // !NDEBUG
} // namespace blob_db
} // namespace rocksdb
#endif // ROCKSDB_LITE
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