f0dde49cda
Summary: Garbage collection checks if the offset in blob index matches the offset of the blob value in the file. If it is a mismatch, the value is the current version. However it failed to check if the blob index is an inlined type, which don't even have an offset. Fixing it. Closes https://github.com/facebook/rocksdb/pull/3194 Differential Revision: D6394270 Pulled By: yiwu-arbug fbshipit-source-id: 7c2b9d795f1116f55f4d728086980f9b6e88ea78
2227 lines
73 KiB
C++
2227 lines
73 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#ifndef ROCKSDB_LITE
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#include "utilities/blob_db/blob_db_impl.h"
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#include <algorithm>
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#include <cinttypes>
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#include <iomanip>
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#include <limits>
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#include <memory>
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#include "db/db_impl.h"
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#include "db/write_batch_internal.h"
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#include "monitoring/instrumented_mutex.h"
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#include "rocksdb/convenience.h"
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#include "rocksdb/env.h"
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#include "rocksdb/iterator.h"
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#include "rocksdb/utilities/stackable_db.h"
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#include "rocksdb/utilities/transaction.h"
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#include "table/block.h"
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#include "table/block_based_table_builder.h"
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#include "table/block_builder.h"
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#include "table/meta_blocks.h"
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#include "util/cast_util.h"
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#include "util/crc32c.h"
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#include "util/file_reader_writer.h"
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#include "util/filename.h"
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#include "util/logging.h"
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#include "util/mutexlock.h"
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#include "util/random.h"
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#include "util/sync_point.h"
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#include "util/timer_queue.h"
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#include "utilities/blob_db/blob_db_iterator.h"
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#include "utilities/blob_db/blob_index.h"
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namespace {
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int kBlockBasedTableVersionFormat = 2;
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} // end namespace
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namespace rocksdb {
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namespace blob_db {
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Random blob_rgen(static_cast<uint32_t>(time(nullptr)));
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void BlobDBFlushBeginListener::OnFlushBegin(DB* db, const FlushJobInfo& info) {
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if (impl_) impl_->OnFlushBeginHandler(db, info);
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}
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WalFilter::WalProcessingOption BlobReconcileWalFilter::LogRecordFound(
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unsigned long long log_number, const std::string& log_file_name,
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const WriteBatch& batch, WriteBatch* new_batch, bool* batch_changed) {
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return WalFilter::WalProcessingOption::kContinueProcessing;
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}
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bool blobf_compare_ttl::operator()(const std::shared_ptr<BlobFile>& lhs,
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const std::shared_ptr<BlobFile>& rhs) const {
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if (lhs->expiration_range_.first < rhs->expiration_range_.first) {
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return true;
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}
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if (lhs->expiration_range_.first > rhs->expiration_range_.first) {
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return false;
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}
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return lhs->BlobFileNumber() < rhs->BlobFileNumber();
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}
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void EvictAllVersionsCompactionListener::InternalListener::OnCompaction(
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int level, const Slice& key,
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CompactionEventListener::CompactionListenerValueType value_type,
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const Slice& existing_value, const SequenceNumber& sn, bool is_new) {
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assert(impl_->bdb_options_.enable_garbage_collection);
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if (!is_new &&
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value_type ==
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CompactionEventListener::CompactionListenerValueType::kValue) {
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BlobIndex blob_index;
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Status s = blob_index.DecodeFrom(existing_value);
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if (s.ok()) {
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if (impl_->debug_level_ >= 3)
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ROCKS_LOG_INFO(
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impl_->db_options_.info_log,
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"CALLBACK COMPACTED OUT KEY: %s SN: %d "
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"NEW: %d FN: %" PRIu64 " OFFSET: %" PRIu64 " SIZE: %" PRIu64,
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key.ToString().c_str(), sn, is_new, blob_index.file_number(),
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blob_index.offset(), blob_index.size());
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impl_->override_vals_q_.enqueue({blob_index.file_number(), key.size(),
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blob_index.offset(), blob_index.size(),
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sn});
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}
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} else {
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if (impl_->debug_level_ >= 3)
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ROCKS_LOG_INFO(impl_->db_options_.info_log,
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"CALLBACK NEW KEY: %s SN: %d NEW: %d",
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key.ToString().c_str(), sn, is_new);
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}
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}
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BlobDBImpl::BlobDBImpl(const std::string& dbname,
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const BlobDBOptions& blob_db_options,
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const DBOptions& db_options)
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: BlobDB(nullptr),
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db_impl_(nullptr),
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env_(db_options.env),
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ttl_extractor_(blob_db_options.ttl_extractor.get()),
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bdb_options_(blob_db_options),
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db_options_(db_options),
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env_options_(db_options),
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dir_change_(false),
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next_file_number_(1),
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epoch_of_(0),
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shutdown_(false),
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current_epoch_(0),
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open_file_count_(0),
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last_period_write_(0),
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last_period_ampl_(0),
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total_periods_write_(0),
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total_periods_ampl_(0),
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total_blob_space_(0),
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open_p1_done_(false),
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debug_level_(0),
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oldest_file_evicted_(false) {
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blob_dir_ = (bdb_options_.path_relative)
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? dbname + "/" + bdb_options_.blob_dir
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: bdb_options_.blob_dir;
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}
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Status BlobDBImpl::LinkToBaseDB(DB* db) {
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assert(db_ == nullptr);
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assert(open_p1_done_);
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db_ = db;
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// the Base DB in-itself can be a stackable DB
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db_impl_ = static_cast_with_check<DBImpl, DB>(db_->GetRootDB());
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env_ = db_->GetEnv();
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Status s = env_->CreateDirIfMissing(blob_dir_);
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if (!s.ok()) {
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ROCKS_LOG_WARN(db_options_.info_log,
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"Failed to create blob directory: %s status: '%s'",
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blob_dir_.c_str(), s.ToString().c_str());
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}
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s = env_->NewDirectory(blob_dir_, &dir_ent_);
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if (!s.ok()) {
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ROCKS_LOG_WARN(db_options_.info_log,
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"Failed to open blob directory: %s status: '%s'",
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blob_dir_.c_str(), s.ToString().c_str());
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}
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if (!bdb_options_.disable_background_tasks) {
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StartBackgroundTasks();
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}
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return s;
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}
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BlobDBOptions BlobDBImpl::GetBlobDBOptions() const { return bdb_options_; }
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BlobDBImpl::BlobDBImpl(DB* db, const BlobDBOptions& blob_db_options)
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: BlobDB(db),
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db_impl_(static_cast_with_check<DBImpl, DB>(db)),
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bdb_options_(blob_db_options),
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db_options_(db->GetOptions()),
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env_options_(db_->GetOptions()),
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dir_change_(false),
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next_file_number_(1),
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epoch_of_(0),
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shutdown_(false),
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current_epoch_(0),
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open_file_count_(0),
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last_period_write_(0),
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last_period_ampl_(0),
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total_periods_write_(0),
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total_periods_ampl_(0),
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total_blob_space_(0),
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oldest_file_evicted_(false) {
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if (!bdb_options_.blob_dir.empty())
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blob_dir_ = (bdb_options_.path_relative)
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? db_->GetName() + "/" + bdb_options_.blob_dir
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: bdb_options_.blob_dir;
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}
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BlobDBImpl::~BlobDBImpl() {
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// CancelAllBackgroundWork(db_, true);
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Shutdown();
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}
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Status BlobDBImpl::OpenPhase1() {
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assert(db_ == nullptr);
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if (blob_dir_.empty())
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return Status::NotSupported("No blob directory in options");
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std::unique_ptr<Directory> dir_ent;
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Status s = env_->NewDirectory(blob_dir_, &dir_ent);
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if (!s.ok()) {
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ROCKS_LOG_WARN(db_options_.info_log,
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"Failed to open blob directory: %s status: '%s'",
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blob_dir_.c_str(), s.ToString().c_str());
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open_p1_done_ = true;
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return Status::OK();
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}
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s = OpenAllFiles();
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open_p1_done_ = true;
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return s;
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}
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void BlobDBImpl::StartBackgroundTasks() {
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// store a call to a member function and object
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tqueue_.add(
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kReclaimOpenFilesPeriodMillisecs,
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std::bind(&BlobDBImpl::ReclaimOpenFiles, this, std::placeholders::_1));
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tqueue_.add(kGCCheckPeriodMillisecs,
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std::bind(&BlobDBImpl::RunGC, this, std::placeholders::_1));
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if (bdb_options_.enable_garbage_collection) {
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tqueue_.add(
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kDeleteCheckPeriodMillisecs,
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std::bind(&BlobDBImpl::EvictDeletions, this, std::placeholders::_1));
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tqueue_.add(
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kDeleteCheckPeriodMillisecs,
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std::bind(&BlobDBImpl::EvictCompacted, this, std::placeholders::_1));
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}
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tqueue_.add(
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kDeleteObsoleteFilesPeriodMillisecs,
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std::bind(&BlobDBImpl::DeleteObsoleteFiles, this, std::placeholders::_1));
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tqueue_.add(kSanityCheckPeriodMillisecs,
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std::bind(&BlobDBImpl::SanityCheck, this, std::placeholders::_1));
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tqueue_.add(kWriteAmplificationStatsPeriodMillisecs,
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std::bind(&BlobDBImpl::WaStats, this, std::placeholders::_1));
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tqueue_.add(kFSyncFilesPeriodMillisecs,
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std::bind(&BlobDBImpl::FsyncFiles, this, std::placeholders::_1));
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tqueue_.add(
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kCheckSeqFilesPeriodMillisecs,
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std::bind(&BlobDBImpl::CheckSeqFiles, this, std::placeholders::_1));
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}
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void BlobDBImpl::Shutdown() { shutdown_.store(true); }
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void BlobDBImpl::OnFlushBeginHandler(DB* db, const FlushJobInfo& info) {
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if (shutdown_.load()) return;
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// a callback that happens too soon needs to be ignored
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if (!db_) return;
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FsyncFiles(false);
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}
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Status BlobDBImpl::GetAllLogFiles(
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std::set<std::pair<uint64_t, std::string>>* file_nums) {
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std::vector<std::string> all_files;
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Status status = env_->GetChildren(blob_dir_, &all_files);
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if (!status.ok()) {
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return status;
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}
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for (const auto& f : all_files) {
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uint64_t number;
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FileType type;
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bool psucc = ParseFileName(f, &number, &type);
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if (psucc && type == kBlobFile) {
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file_nums->insert(std::make_pair(number, f));
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} else {
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ROCKS_LOG_WARN(db_options_.info_log,
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"Skipping file in blob directory %s parse: %d type: %d",
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f.c_str(), psucc, ((psucc) ? type : -1));
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}
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}
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return status;
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}
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Status BlobDBImpl::OpenAllFiles() {
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WriteLock wl(&mutex_);
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std::set<std::pair<uint64_t, std::string>> file_nums;
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Status status = GetAllLogFiles(&file_nums);
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if (!status.ok()) {
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ROCKS_LOG_ERROR(db_options_.info_log,
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"Failed to collect files from blob dir: %s status: '%s'",
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blob_dir_.c_str(), status.ToString().c_str());
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return status;
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}
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ROCKS_LOG_INFO(db_options_.info_log,
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"BlobDir files path: %s count: %d min: %" PRIu64
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" max: %" PRIu64,
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blob_dir_.c_str(), static_cast<int>(file_nums.size()),
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(file_nums.empty()) ? -1 : file_nums.cbegin()->first,
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(file_nums.empty()) ? -1 : file_nums.crbegin()->first);
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if (!file_nums.empty())
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next_file_number_.store((file_nums.rbegin())->first + 1);
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for (auto& f_iter : file_nums) {
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std::string bfpath = BlobFileName(blob_dir_, f_iter.first);
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uint64_t size_bytes;
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Status s1 = env_->GetFileSize(bfpath, &size_bytes);
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if (!s1.ok()) {
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ROCKS_LOG_WARN(
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db_options_.info_log,
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"Unable to get size of %s. File skipped from open status: '%s'",
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bfpath.c_str(), s1.ToString().c_str());
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continue;
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}
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if (debug_level_ >= 1)
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ROCKS_LOG_INFO(db_options_.info_log, "Blob File open: %s size: %" PRIu64,
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bfpath.c_str(), size_bytes);
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std::shared_ptr<BlobFile> bfptr =
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std::make_shared<BlobFile>(this, blob_dir_, f_iter.first);
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bfptr->SetFileSize(size_bytes);
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// since this file already existed, we will try to reconcile
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// deleted count with LSM
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bfptr->gc_once_after_open_ = true;
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// read header
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std::shared_ptr<Reader> reader;
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reader = bfptr->OpenSequentialReader(env_, db_options_, env_options_);
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s1 = reader->ReadHeader(&bfptr->header_);
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if (!s1.ok()) {
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ROCKS_LOG_ERROR(db_options_.info_log,
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"Failure to read header for blob-file %s "
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"status: '%s' size: %" PRIu64,
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bfpath.c_str(), s1.ToString().c_str(), size_bytes);
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continue;
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}
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bfptr->SetHasTTL(bfptr->header_.has_ttl);
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bfptr->SetCompression(bfptr->header_.compression);
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bfptr->header_valid_ = true;
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std::shared_ptr<RandomAccessFileReader> ra_reader =
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GetOrOpenRandomAccessReader(bfptr, env_, env_options_);
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BlobLogFooter bf;
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s1 = bfptr->ReadFooter(&bf);
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bfptr->CloseRandomAccessLocked();
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if (s1.ok()) {
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s1 = bfptr->SetFromFooterLocked(bf);
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if (!s1.ok()) {
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ROCKS_LOG_ERROR(db_options_.info_log,
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"Header Footer mismatch for blob-file %s "
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"status: '%s' size: %" PRIu64,
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bfpath.c_str(), s1.ToString().c_str(), size_bytes);
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continue;
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}
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} else {
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ROCKS_LOG_INFO(db_options_.info_log,
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"File found incomplete (w/o footer) %s", bfpath.c_str());
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// sequentially iterate over the file and read all the records
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ExpirationRange expiration_range(std::numeric_limits<uint32_t>::max(),
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std::numeric_limits<uint32_t>::min());
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uint64_t blob_count = 0;
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BlobLogRecord record;
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Reader::ReadLevel shallow = Reader::kReadHeaderKey;
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uint64_t record_start = reader->GetNextByte();
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// TODO(arahut) - when we detect corruption, we should truncate
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while (reader->ReadRecord(&record, shallow).ok()) {
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++blob_count;
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if (bfptr->HasTTL()) {
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expiration_range.first =
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std::min(expiration_range.first, record.expiration);
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expiration_range.second =
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std::max(expiration_range.second, record.expiration);
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}
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record_start = reader->GetNextByte();
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}
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if (record_start != bfptr->GetFileSize()) {
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ROCKS_LOG_ERROR(db_options_.info_log,
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"Blob file is corrupted or crashed during write %s"
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" good_size: %" PRIu64 " file_size: %" PRIu64,
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bfpath.c_str(), record_start, bfptr->GetFileSize());
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}
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if (!blob_count) {
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ROCKS_LOG_INFO(db_options_.info_log, "BlobCount = 0 in file %s",
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bfpath.c_str());
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continue;
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}
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bfptr->SetBlobCount(blob_count);
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bfptr->SetSequenceRange({0, 0});
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ROCKS_LOG_INFO(db_options_.info_log,
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"Blob File: %s blob_count: %" PRIu64
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" size_bytes: %" PRIu64 " has_ttl: %d",
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bfpath.c_str(), blob_count, size_bytes, bfptr->HasTTL());
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if (bfptr->HasTTL()) {
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expiration_range.second = std::max(
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expiration_range.second,
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expiration_range.first + (uint32_t)bdb_options_.ttl_range_secs);
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bfptr->set_expiration_range(expiration_range);
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uint64_t now = EpochNow();
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if (expiration_range.second < now) {
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Status fstatus = CreateWriterLocked(bfptr);
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if (fstatus.ok()) fstatus = bfptr->WriteFooterAndCloseLocked();
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if (!fstatus.ok()) {
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ROCKS_LOG_ERROR(
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db_options_.info_log,
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"Failed to close Blob File: %s status: '%s'. Skipped",
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bfpath.c_str(), fstatus.ToString().c_str());
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continue;
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} else {
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ROCKS_LOG_ERROR(
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db_options_.info_log,
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"Blob File Closed: %s now: %d expiration_range: (%d, %d)",
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bfpath.c_str(), now, expiration_range.first,
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expiration_range.second);
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}
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} else {
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open_ttl_files_.insert(bfptr);
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}
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}
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}
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blob_files_.insert(std::make_pair(f_iter.first, bfptr));
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}
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return status;
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}
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void BlobDBImpl::CloseRandomAccessLocked(
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const std::shared_ptr<BlobFile>& bfile) {
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bfile->CloseRandomAccessLocked();
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open_file_count_--;
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}
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std::shared_ptr<RandomAccessFileReader> BlobDBImpl::GetOrOpenRandomAccessReader(
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const std::shared_ptr<BlobFile>& bfile, Env* env,
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const EnvOptions& env_options) {
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bool fresh_open = false;
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auto rar = bfile->GetOrOpenRandomAccessReader(env, env_options, &fresh_open);
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if (fresh_open) open_file_count_++;
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return rar;
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}
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std::shared_ptr<BlobFile> BlobDBImpl::NewBlobFile(const std::string& reason) {
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uint64_t file_num = next_file_number_++;
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auto bfile = std::make_shared<BlobFile>(this, blob_dir_, file_num);
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ROCKS_LOG_DEBUG(db_options_.info_log, "New blob file created: %s reason='%s'",
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bfile->PathName().c_str(), reason.c_str());
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LogFlush(db_options_.info_log);
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return bfile;
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}
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Status BlobDBImpl::CreateWriterLocked(const std::shared_ptr<BlobFile>& bfile) {
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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);
|
|
bfile->SetCompression(bdb_options_.compression);
|
|
|
|
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->SetCompression(bdb_options_.compression);
|
|
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) {
|
|
|
|
uint32_t default_cf_id =
|
|
reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily())->GetID();
|
|
// TODO(yiwu): In case there are multiple writers the latest sequence would
|
|
// not be the actually sequence we are writting. Need to get the sequence
|
|
// from write batch after DB write instead.
|
|
SequenceNumber current_seq = GetLatestSequenceNumber() + 1;
|
|
Status s;
|
|
BlobInserter blob_inserter(options, this, default_cf_id, current_seq);
|
|
{
|
|
// Release write_mutex_ before DB write to avoid race condition with
|
|
// flush begin listener, which also require write_mutex_ to sync
|
|
// blob files.
|
|
MutexLock l(&write_mutex_);
|
|
s = updates->Iterate(&blob_inserter);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
s = db_->Write(options, blob_inserter.batch());
|
|
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_;
|
|
};
|
|
|
|
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");
|
|
Status s;
|
|
WriteBatch batch;
|
|
{
|
|
// Release write_mutex_ before DB write to avoid race condition with
|
|
// flush begin listener, which also require write_mutex_ to sync
|
|
// blob files.
|
|
MutexLock l(&write_mutex_);
|
|
// TODO(yiwu): In case there are multiple writers the latest sequence would
|
|
// not be the actually sequence we are writting. Need to get the sequence
|
|
// from write batch after DB write instead.
|
|
SequenceNumber sequence = GetLatestSequenceNumber() + 1;
|
|
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");
|
|
}
|
|
|
|
assert(bfile->compression() == bdb_options_.compression);
|
|
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");
|
|
}
|
|
|
|
if (bfile->compression() != kNoCompression) {
|
|
BlockContents contents;
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(DefaultColumnFamily());
|
|
s = UncompressBlockContentsForCompressionType(
|
|
blob_value.data(), blob_value.size(), &contents,
|
|
kBlockBasedTableVersionFormat, Slice(), bfile->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() && is_blob_index) {
|
|
std::string index_entry = value->ToString();
|
|
value->Reset();
|
|
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,
|
|
"Closing blob file %" PRIu64 ". Path: %s",
|
|
bfile->BlobFileNumber(), bfile->PathName().c_str());
|
|
{
|
|
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.IsInlined() ||
|
|
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.
|
|
// TODO(yiwu): Blob indexes will be remove by BlobIndexCompactionFilter.
|
|
// We can just drop the blob record.
|
|
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
|