837705ad80
Summary: In https://github.com/facebook/rocksdb/issues/8454, I introduced a new process baptized `MemPurge` (memtable garbage collection). This new PR is built upon this past mempurge prototype. In this PR, I made the `mempurge` process a background task, which provides superior performance since the mempurge process does not cling on the db_mutex anymore, and addresses severe restrictions from the past iteration (including a scenario where the past mempurge was failling, when a memtable was mempurged but was still referred to by an iterator/snapshot/...). Now the mempurge process ressembles an in-memory compaction process: the stack of immutable memtables is filtered out, and the useful payload is used to populate an output memtable. If the output memtable is filled at more than 60% capacity (arbitrary heuristic) the mempurge process is aborted and a regular flush process takes place, else the output memtable is kept in the immutable memtable stack. Note that adding this output memtable to the `imm()` memtable stack does not trigger another flush process, so that the flush thread can go to sleep at the end of a successful mempurge. MemPurge is activated by making the `experimental_allow_mempurge` flag `true`. When activated, the `MemPurge` process will always happen when the flush reason is `kWriteBufferFull`. The 3 unit tests confirm that this process supports `Put`, `Get`, `Delete`, `DeleteRange` operators and is compatible with `Iterators` and `CompactionFilters`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8505 Reviewed By: pdillinger Differential Revision: D29619283 Pulled By: bjlemaire fbshipit-source-id: 8a99bee76b63a8211bff1a00e0ae32360aaece95
789 lines
30 KiB
C++
789 lines
30 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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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/flush_job.h"
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#include <cinttypes>
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#include <algorithm>
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#include <vector>
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#include "db/builder.h"
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "db/event_helpers.h"
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "db/memtable.h"
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#include "db/memtable_list.h"
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#include "db/merge_context.h"
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#include "db/range_tombstone_fragmenter.h"
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#include "db/version_set.h"
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#include "file/file_util.h"
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#include "file/filename.h"
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#include "logging/event_logger.h"
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#include "logging/log_buffer.h"
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#include "logging/logging.h"
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#include "monitoring/iostats_context_imp.h"
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#include "monitoring/perf_context_imp.h"
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#include "monitoring/thread_status_util.h"
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#include "port/port.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/status.h"
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#include "rocksdb/table.h"
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#include "table/merging_iterator.h"
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#include "table/table_builder.h"
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#include "table/two_level_iterator.h"
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#include "test_util/sync_point.h"
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#include "util/coding.h"
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#include "util/mutexlock.h"
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#include "util/stop_watch.h"
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namespace ROCKSDB_NAMESPACE {
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const char* GetFlushReasonString (FlushReason flush_reason) {
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switch (flush_reason) {
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case FlushReason::kOthers:
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return "Other Reasons";
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case FlushReason::kGetLiveFiles:
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return "Get Live Files";
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case FlushReason::kShutDown:
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return "Shut down";
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case FlushReason::kExternalFileIngestion:
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return "External File Ingestion";
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case FlushReason::kManualCompaction:
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return "Manual Compaction";
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case FlushReason::kWriteBufferManager:
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return "Write Buffer Manager";
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case FlushReason::kWriteBufferFull:
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return "Write Buffer Full";
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case FlushReason::kTest:
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return "Test";
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case FlushReason::kDeleteFiles:
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return "Delete Files";
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case FlushReason::kAutoCompaction:
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return "Auto Compaction";
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case FlushReason::kManualFlush:
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return "Manual Flush";
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case FlushReason::kErrorRecovery:
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return "Error Recovery";
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case FlushReason::kWalFull:
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return "WAL Full";
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default:
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return "Invalid";
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}
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}
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FlushJob::FlushJob(
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const std::string& dbname, ColumnFamilyData* cfd,
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const ImmutableDBOptions& db_options,
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const MutableCFOptions& mutable_cf_options, uint64_t max_memtable_id,
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const FileOptions& file_options, VersionSet* versions,
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InstrumentedMutex* db_mutex, std::atomic<bool>* shutting_down,
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std::vector<SequenceNumber> existing_snapshots,
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SequenceNumber earliest_write_conflict_snapshot,
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SnapshotChecker* snapshot_checker, JobContext* job_context,
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LogBuffer* log_buffer, FSDirectory* db_directory,
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FSDirectory* output_file_directory, CompressionType output_compression,
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Statistics* stats, EventLogger* event_logger, bool measure_io_stats,
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const bool sync_output_directory, const bool write_manifest,
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Env::Priority thread_pri, const std::shared_ptr<IOTracer>& io_tracer,
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const std::string& db_id, const std::string& db_session_id,
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std::string full_history_ts_low, BlobFileCompletionCallback* blob_callback)
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: dbname_(dbname),
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db_id_(db_id),
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db_session_id_(db_session_id),
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cfd_(cfd),
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db_options_(db_options),
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mutable_cf_options_(mutable_cf_options),
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max_memtable_id_(max_memtable_id),
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file_options_(file_options),
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versions_(versions),
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db_mutex_(db_mutex),
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shutting_down_(shutting_down),
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existing_snapshots_(std::move(existing_snapshots)),
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earliest_write_conflict_snapshot_(earliest_write_conflict_snapshot),
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snapshot_checker_(snapshot_checker),
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job_context_(job_context),
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log_buffer_(log_buffer),
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db_directory_(db_directory),
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output_file_directory_(output_file_directory),
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output_compression_(output_compression),
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stats_(stats),
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event_logger_(event_logger),
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measure_io_stats_(measure_io_stats),
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sync_output_directory_(sync_output_directory),
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write_manifest_(write_manifest),
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edit_(nullptr),
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base_(nullptr),
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pick_memtable_called(false),
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thread_pri_(thread_pri),
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io_tracer_(io_tracer),
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clock_(db_options_.clock),
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full_history_ts_low_(std::move(full_history_ts_low)),
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blob_callback_(blob_callback) {
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// Update the thread status to indicate flush.
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ReportStartedFlush();
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TEST_SYNC_POINT("FlushJob::FlushJob()");
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}
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FlushJob::~FlushJob() {
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io_status_.PermitUncheckedError();
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ThreadStatusUtil::ResetThreadStatus();
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}
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void FlushJob::ReportStartedFlush() {
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ThreadStatusUtil::SetColumnFamily(cfd_, cfd_->ioptions()->env,
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db_options_.enable_thread_tracking);
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ThreadStatusUtil::SetThreadOperation(ThreadStatus::OP_FLUSH);
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ThreadStatusUtil::SetThreadOperationProperty(
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ThreadStatus::COMPACTION_JOB_ID,
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job_context_->job_id);
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IOSTATS_RESET(bytes_written);
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}
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void FlushJob::ReportFlushInputSize(const autovector<MemTable*>& mems) {
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uint64_t input_size = 0;
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for (auto* mem : mems) {
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input_size += mem->ApproximateMemoryUsage();
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}
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ThreadStatusUtil::IncreaseThreadOperationProperty(
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ThreadStatus::FLUSH_BYTES_MEMTABLES,
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input_size);
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}
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void FlushJob::RecordFlushIOStats() {
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RecordTick(stats_, FLUSH_WRITE_BYTES, IOSTATS(bytes_written));
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ThreadStatusUtil::IncreaseThreadOperationProperty(
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ThreadStatus::FLUSH_BYTES_WRITTEN, IOSTATS(bytes_written));
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IOSTATS_RESET(bytes_written);
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}
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void FlushJob::PickMemTable() {
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db_mutex_->AssertHeld();
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assert(!pick_memtable_called);
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pick_memtable_called = true;
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// Save the contents of the earliest memtable as a new Table
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cfd_->imm()->PickMemtablesToFlush(max_memtable_id_, &mems_);
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if (mems_.empty()) {
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return;
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}
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ReportFlushInputSize(mems_);
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// entries mems are (implicitly) sorted in ascending order by their created
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// time. We will use the first memtable's `edit` to keep the meta info for
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// this flush.
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MemTable* m = mems_[0];
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edit_ = m->GetEdits();
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edit_->SetPrevLogNumber(0);
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// SetLogNumber(log_num) indicates logs with number smaller than log_num
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// will no longer be picked up for recovery.
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edit_->SetLogNumber(mems_.back()->GetNextLogNumber());
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edit_->SetColumnFamily(cfd_->GetID());
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// path 0 for level 0 file.
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meta_.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
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base_ = cfd_->current();
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base_->Ref(); // it is likely that we do not need this reference
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}
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Status FlushJob::Run(LogsWithPrepTracker* prep_tracker,
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FileMetaData* file_meta) {
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TEST_SYNC_POINT("FlushJob::Start");
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db_mutex_->AssertHeld();
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assert(pick_memtable_called);
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AutoThreadOperationStageUpdater stage_run(
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ThreadStatus::STAGE_FLUSH_RUN);
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if (mems_.empty()) {
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ROCKS_LOG_BUFFER(log_buffer_, "[%s] Nothing in memtable to flush",
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cfd_->GetName().c_str());
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return Status::OK();
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}
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// I/O measurement variables
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PerfLevel prev_perf_level = PerfLevel::kEnableTime;
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uint64_t prev_write_nanos = 0;
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uint64_t prev_fsync_nanos = 0;
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uint64_t prev_range_sync_nanos = 0;
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uint64_t prev_prepare_write_nanos = 0;
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uint64_t prev_cpu_write_nanos = 0;
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uint64_t prev_cpu_read_nanos = 0;
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if (measure_io_stats_) {
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prev_perf_level = GetPerfLevel();
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SetPerfLevel(PerfLevel::kEnableTime);
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prev_write_nanos = IOSTATS(write_nanos);
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prev_fsync_nanos = IOSTATS(fsync_nanos);
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prev_range_sync_nanos = IOSTATS(range_sync_nanos);
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prev_prepare_write_nanos = IOSTATS(prepare_write_nanos);
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prev_cpu_write_nanos = IOSTATS(cpu_write_nanos);
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prev_cpu_read_nanos = IOSTATS(cpu_read_nanos);
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}
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Status mempurge_s = Status::NotFound("No MemPurge.");
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if (db_options_.experimental_allow_mempurge &&
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(cfd_->GetFlushReason() == FlushReason::kWriteBufferFull) &&
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(!mems_.empty())) {
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mempurge_s = MemPurge();
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if (!mempurge_s.ok()) {
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ROCKS_LOG_INFO(db_options_.info_log,
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"Mempurge process unsuccessful: %s\n",
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mempurge_s.ToString().c_str());
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}
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}
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Status s;
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if (mempurge_s.ok()) {
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base_->Unref();
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s = Status::OK();
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} else {
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// This will release and re-acquire the mutex.
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s = WriteLevel0Table();
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}
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if (s.ok() && cfd_->IsDropped()) {
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s = Status::ColumnFamilyDropped("Column family dropped during compaction");
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}
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if ((s.ok() || s.IsColumnFamilyDropped()) &&
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shutting_down_->load(std::memory_order_acquire)) {
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s = Status::ShutdownInProgress("Database shutdown");
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}
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if (!s.ok()) {
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cfd_->imm()->RollbackMemtableFlush(mems_, meta_.fd.GetNumber());
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} else if (write_manifest_) {
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TEST_SYNC_POINT("FlushJob::InstallResults");
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// Replace immutable memtable with the generated Table
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IOStatus tmp_io_s;
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s = cfd_->imm()->TryInstallMemtableFlushResults(
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cfd_, mutable_cf_options_, mems_, prep_tracker, versions_, db_mutex_,
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meta_.fd.GetNumber(), &job_context_->memtables_to_free, db_directory_,
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log_buffer_, &committed_flush_jobs_info_, &tmp_io_s);
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if (!tmp_io_s.ok()) {
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io_status_ = tmp_io_s;
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}
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}
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if (s.ok() && file_meta != nullptr) {
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*file_meta = meta_;
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}
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RecordFlushIOStats();
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// When measure_io_stats_ is true, the default 512 bytes is not enough.
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auto stream = event_logger_->LogToBuffer(log_buffer_, 1024);
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stream << "job" << job_context_->job_id << "event"
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<< "flush_finished";
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stream << "output_compression"
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<< CompressionTypeToString(output_compression_);
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stream << "lsm_state";
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stream.StartArray();
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auto vstorage = cfd_->current()->storage_info();
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for (int level = 0; level < vstorage->num_levels(); ++level) {
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stream << vstorage->NumLevelFiles(level);
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}
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stream.EndArray();
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const auto& blob_files = vstorage->GetBlobFiles();
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if (!blob_files.empty()) {
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stream << "blob_file_head" << blob_files.begin()->first;
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stream << "blob_file_tail" << blob_files.rbegin()->first;
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}
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stream << "immutable_memtables" << cfd_->imm()->NumNotFlushed();
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if (measure_io_stats_) {
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if (prev_perf_level != PerfLevel::kEnableTime) {
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SetPerfLevel(prev_perf_level);
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}
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stream << "file_write_nanos" << (IOSTATS(write_nanos) - prev_write_nanos);
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stream << "file_range_sync_nanos"
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<< (IOSTATS(range_sync_nanos) - prev_range_sync_nanos);
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stream << "file_fsync_nanos" << (IOSTATS(fsync_nanos) - prev_fsync_nanos);
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stream << "file_prepare_write_nanos"
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<< (IOSTATS(prepare_write_nanos) - prev_prepare_write_nanos);
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stream << "file_cpu_write_nanos"
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<< (IOSTATS(cpu_write_nanos) - prev_cpu_write_nanos);
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stream << "file_cpu_read_nanos"
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<< (IOSTATS(cpu_read_nanos) - prev_cpu_read_nanos);
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}
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return s;
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}
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void FlushJob::Cancel() {
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db_mutex_->AssertHeld();
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assert(base_ != nullptr);
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base_->Unref();
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}
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Status FlushJob::MemPurge() {
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Status s;
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db_mutex_->AssertHeld();
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db_mutex_->Unlock();
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assert(!mems_.empty());
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MemTable* new_mem = nullptr;
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// Create two iterators, one for the memtable data (contains
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// info from puts + deletes), and one for the memtable
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// Range Tombstones (from DeleteRanges).
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ReadOptions ro;
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ro.total_order_seek = true;
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Arena arena;
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std::vector<InternalIterator*> memtables;
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std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
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range_del_iters;
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for (MemTable* m : mems_) {
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memtables.push_back(m->NewIterator(ro, &arena));
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auto* range_del_iter = m->NewRangeTombstoneIterator(ro, kMaxSequenceNumber);
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if (range_del_iter != nullptr) {
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range_del_iters.emplace_back(range_del_iter);
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}
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}
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assert(!memtables.empty());
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SequenceNumber first_seqno = mems_[0]->GetFirstSequenceNumber();
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SequenceNumber earliest_seqno = mems_[0]->GetEarliestSequenceNumber();
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ScopedArenaIterator iter(
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NewMergingIterator(&(cfd_->internal_comparator()), memtables.data(),
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static_cast<int>(memtables.size()), &arena));
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auto* ioptions = cfd_->ioptions();
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// Place iterator at the First (meaning most recent) key node.
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iter->SeekToFirst();
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std::unique_ptr<CompactionRangeDelAggregator> range_del_agg(
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new CompactionRangeDelAggregator(&(cfd_->internal_comparator()),
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existing_snapshots_));
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for (auto& rd_iter : range_del_iters) {
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range_del_agg->AddTombstones(std::move(rd_iter));
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}
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// If there is valid data in the memtable,
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// or at least range tombstones, copy over the info
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// to the new memtable.
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if (iter->Valid() || !range_del_agg->IsEmpty()) {
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// Arbitrary heuristic: maxSize is 60% cpacity.
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size_t maxSize = ((mutable_cf_options_.write_buffer_size + 6U) / 10U);
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std::unique_ptr<CompactionFilter> compaction_filter;
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if (ioptions->compaction_filter_factory != nullptr &&
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ioptions->compaction_filter_factory->ShouldFilterTableFileCreation(
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TableFileCreationReason::kFlush)) {
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CompactionFilter::Context ctx;
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ctx.is_full_compaction = false;
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ctx.is_manual_compaction = false;
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ctx.column_family_id = cfd_->GetID();
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ctx.reason = TableFileCreationReason::kFlush;
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compaction_filter =
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ioptions->compaction_filter_factory->CreateCompactionFilter(ctx);
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if (compaction_filter != nullptr &&
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!compaction_filter->IgnoreSnapshots()) {
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s = Status::NotSupported(
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"CompactionFilter::IgnoreSnapshots() = false is not supported "
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"anymore.");
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return s;
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}
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}
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// mems are ordered by increasing ID, so mems_[0]->GetID
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// returns the smallest memtable ID.
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new_mem =
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new MemTable((cfd_->internal_comparator()), *(cfd_->ioptions()),
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mutable_cf_options_, cfd_->write_buffer_mgr(),
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mems_[0]->GetEarliestSequenceNumber(), cfd_->GetID());
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assert(new_mem != nullptr);
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Env* env = db_options_.env;
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assert(env);
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MergeHelper merge(
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env, (cfd_->internal_comparator()).user_comparator(),
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(ioptions->merge_operator).get(), compaction_filter.get(),
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ioptions->logger, true /* internal key corruption is not ok */,
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existing_snapshots_.empty() ? 0 : existing_snapshots_.back(),
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snapshot_checker_);
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CompactionIterator c_iter(
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iter.get(), (cfd_->internal_comparator()).user_comparator(), &merge,
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kMaxSequenceNumber, &existing_snapshots_,
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earliest_write_conflict_snapshot_, snapshot_checker_, env,
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ShouldReportDetailedTime(env, ioptions->stats),
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true /* internal key corruption is not ok */, range_del_agg.get(),
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nullptr, ioptions->allow_data_in_errors,
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/*compaction=*/nullptr, compaction_filter.get(),
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/*shutting_down=*/nullptr,
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/*preserve_deletes_seqnum=*/0, /*manual_compaction_paused=*/nullptr,
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/*manual_compaction_canceled=*/nullptr, ioptions->info_log,
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&(cfd_->GetFullHistoryTsLow()));
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// Set earliest sequence number in the new memtable
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// to be equal to the earliest sequence number of the
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// memtable being flushed (See later if there is a need
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// to update this number!).
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new_mem->SetEarliestSequenceNumber(earliest_seqno);
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// Likewise for first seq number.
|
|
new_mem->SetFirstSequenceNumber(first_seqno);
|
|
SequenceNumber new_first_seqno = kMaxSequenceNumber;
|
|
|
|
c_iter.SeekToFirst();
|
|
|
|
// Key transfer
|
|
for (; c_iter.Valid(); c_iter.Next()) {
|
|
const ParsedInternalKey ikey = c_iter.ikey();
|
|
const Slice value = c_iter.value();
|
|
new_first_seqno =
|
|
ikey.sequence < new_first_seqno ? ikey.sequence : new_first_seqno;
|
|
|
|
// Should we update "OldestKeyTime" ???? -> timestamp appear
|
|
// to still be an "experimental" feature.
|
|
s = new_mem->Add(
|
|
ikey.sequence, ikey.type, ikey.user_key, value,
|
|
nullptr, // KV protection info set as nullptr since it
|
|
// should only be useful for the first add to
|
|
// the original memtable.
|
|
false, // : allow concurrent_memtable_writes_
|
|
// Not seen as necessary for now.
|
|
nullptr, // get_post_process_info(m) must be nullptr
|
|
// when concurrent_memtable_writes is switched off.
|
|
nullptr); // hint, only used when concurrent_memtable_writes_
|
|
// is switched on.
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
// If new_mem has size greater than maxSize,
|
|
// then rollback to regular flush operation,
|
|
// and destroy new_mem.
|
|
if (new_mem->ApproximateMemoryUsage() > maxSize) {
|
|
s = Status::Aborted("Mempurge filled more than one memtable.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Check status and propagate
|
|
// potential error status from c_iter
|
|
if (!s.ok()) {
|
|
c_iter.status().PermitUncheckedError();
|
|
} else if (!c_iter.status().ok()) {
|
|
s = c_iter.status();
|
|
}
|
|
|
|
// Range tombstone transfer.
|
|
if (s.ok()) {
|
|
auto range_del_it = range_del_agg->NewIterator();
|
|
for (range_del_it->SeekToFirst(); range_del_it->Valid();
|
|
range_del_it->Next()) {
|
|
auto tombstone = range_del_it->Tombstone();
|
|
new_first_seqno =
|
|
tombstone.seq_ < new_first_seqno ? tombstone.seq_ : new_first_seqno;
|
|
s = new_mem->Add(
|
|
tombstone.seq_, // Sequence number
|
|
kTypeRangeDeletion, // KV type
|
|
tombstone.start_key_, // Key is start key.
|
|
tombstone.end_key_, // Value is end key.
|
|
nullptr, // KV protection info set as nullptr since it
|
|
// should only be useful for the first add to
|
|
// the original memtable.
|
|
false, // : allow concurrent_memtable_writes_
|
|
// Not seen as necessary for now.
|
|
nullptr, // get_post_process_info(m) must be nullptr
|
|
// when concurrent_memtable_writes is switched off.
|
|
nullptr); // hint, only used when concurrent_memtable_writes_
|
|
// is switched on.
|
|
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
// If new_mem has size greater than maxSize,
|
|
// then rollback to regular flush operation,
|
|
// and destroy new_mem.
|
|
if (new_mem->ApproximateMemoryUsage() > maxSize) {
|
|
s = Status::Aborted(Slice("Mempurge filled more than one memtable."));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If everything happened smoothly and new_mem contains valid data,
|
|
// decide if it is flushed to storage or kept in the imm()
|
|
// memtable list (memory).
|
|
if (s.ok() && (new_first_seqno != kMaxSequenceNumber)) {
|
|
// Rectify the first sequence number, which (unlike the earliest seq
|
|
// number) needs to be present in the new memtable.
|
|
new_mem->SetFirstSequenceNumber(new_first_seqno);
|
|
|
|
// The new_mem is added to the list of immutable memtables
|
|
// only if it filled at less than 60% capacity (arbitrary heuristic).
|
|
if (new_mem->ApproximateMemoryUsage() < maxSize) {
|
|
db_mutex_->Lock();
|
|
cfd_->imm()
|
|
->Add(new_mem, &job_context_->memtables_to_free, false /* trigger_flush. Adding this memtable will not trigger any flush */);
|
|
new_mem->Ref();
|
|
db_mutex_->Unlock();
|
|
} else {
|
|
s = Status::Aborted(Slice("Mempurge filled more than one memtable."));
|
|
if (new_mem) {
|
|
job_context_->memtables_to_free.push_back(new_mem);
|
|
}
|
|
}
|
|
} else {
|
|
// In this case, the newly allocated new_mem is empty.
|
|
assert(new_mem != nullptr);
|
|
job_context_->memtables_to_free.push_back(new_mem);
|
|
}
|
|
}
|
|
|
|
// Reacquire the mutex for WriteLevel0 function.
|
|
db_mutex_->Lock();
|
|
|
|
// If mempurge successful, don't write input tables to level0,
|
|
// but write any full output table to level0.
|
|
if (s.ok()) {
|
|
TEST_SYNC_POINT("DBImpl::FlushJob:MemPurgeSuccessful");
|
|
} else {
|
|
TEST_SYNC_POINT("DBImpl::FlushJob:MemPurgeUnsuccessful");
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status FlushJob::WriteLevel0Table() {
|
|
AutoThreadOperationStageUpdater stage_updater(
|
|
ThreadStatus::STAGE_FLUSH_WRITE_L0);
|
|
db_mutex_->AssertHeld();
|
|
const uint64_t start_micros = clock_->NowMicros();
|
|
const uint64_t start_cpu_micros = clock_->CPUNanos() / 1000;
|
|
Status s;
|
|
|
|
std::vector<BlobFileAddition> blob_file_additions;
|
|
|
|
{
|
|
auto write_hint = cfd_->CalculateSSTWriteHint(0);
|
|
db_mutex_->Unlock();
|
|
if (log_buffer_) {
|
|
log_buffer_->FlushBufferToLog();
|
|
}
|
|
// memtables and range_del_iters store internal iterators over each data
|
|
// memtable and its associated range deletion memtable, respectively, at
|
|
// corresponding indexes.
|
|
std::vector<InternalIterator*> memtables;
|
|
std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
|
|
range_del_iters;
|
|
ReadOptions ro;
|
|
ro.total_order_seek = true;
|
|
Arena arena;
|
|
uint64_t total_num_entries = 0, total_num_deletes = 0;
|
|
uint64_t total_data_size = 0;
|
|
size_t total_memory_usage = 0;
|
|
for (MemTable* m : mems_) {
|
|
ROCKS_LOG_INFO(
|
|
db_options_.info_log,
|
|
"[%s] [JOB %d] Flushing memtable with next log file: %" PRIu64 "\n",
|
|
cfd_->GetName().c_str(), job_context_->job_id, m->GetNextLogNumber());
|
|
memtables.push_back(m->NewIterator(ro, &arena));
|
|
auto* range_del_iter =
|
|
m->NewRangeTombstoneIterator(ro, kMaxSequenceNumber);
|
|
if (range_del_iter != nullptr) {
|
|
range_del_iters.emplace_back(range_del_iter);
|
|
}
|
|
total_num_entries += m->num_entries();
|
|
total_num_deletes += m->num_deletes();
|
|
total_data_size += m->get_data_size();
|
|
total_memory_usage += m->ApproximateMemoryUsage();
|
|
}
|
|
|
|
event_logger_->Log() << "job" << job_context_->job_id << "event"
|
|
<< "flush_started"
|
|
<< "num_memtables" << mems_.size() << "num_entries"
|
|
<< total_num_entries << "num_deletes"
|
|
<< total_num_deletes << "total_data_size"
|
|
<< total_data_size << "memory_usage"
|
|
<< total_memory_usage << "flush_reason"
|
|
<< GetFlushReasonString(cfd_->GetFlushReason());
|
|
|
|
{
|
|
ScopedArenaIterator iter(
|
|
NewMergingIterator(&cfd_->internal_comparator(), memtables.data(),
|
|
static_cast<int>(memtables.size()), &arena));
|
|
ROCKS_LOG_INFO(db_options_.info_log,
|
|
"[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": started",
|
|
cfd_->GetName().c_str(), job_context_->job_id,
|
|
meta_.fd.GetNumber());
|
|
|
|
TEST_SYNC_POINT_CALLBACK("FlushJob::WriteLevel0Table:output_compression",
|
|
&output_compression_);
|
|
int64_t _current_time = 0;
|
|
auto status = clock_->GetCurrentTime(&_current_time);
|
|
// Safe to proceed even if GetCurrentTime fails. So, log and proceed.
|
|
if (!status.ok()) {
|
|
ROCKS_LOG_WARN(
|
|
db_options_.info_log,
|
|
"Failed to get current time to populate creation_time property. "
|
|
"Status: %s",
|
|
status.ToString().c_str());
|
|
}
|
|
const uint64_t current_time = static_cast<uint64_t>(_current_time);
|
|
|
|
uint64_t oldest_key_time =
|
|
mems_.front()->ApproximateOldestKeyTime();
|
|
|
|
// It's not clear whether oldest_key_time is always available. In case
|
|
// it is not available, use current_time.
|
|
uint64_t oldest_ancester_time = std::min(current_time, oldest_key_time);
|
|
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"FlushJob::WriteLevel0Table:oldest_ancester_time",
|
|
&oldest_ancester_time);
|
|
meta_.oldest_ancester_time = oldest_ancester_time;
|
|
|
|
meta_.file_creation_time = current_time;
|
|
|
|
uint64_t creation_time = (cfd_->ioptions()->compaction_style ==
|
|
CompactionStyle::kCompactionStyleFIFO)
|
|
? current_time
|
|
: meta_.oldest_ancester_time;
|
|
|
|
uint64_t num_input_entries = 0;
|
|
uint64_t memtable_payload_bytes = 0;
|
|
uint64_t memtable_garbage_bytes = 0;
|
|
IOStatus io_s;
|
|
const std::string* const full_history_ts_low =
|
|
(full_history_ts_low_.empty()) ? nullptr : &full_history_ts_low_;
|
|
TableBuilderOptions tboptions(
|
|
*cfd_->ioptions(), mutable_cf_options_, cfd_->internal_comparator(),
|
|
cfd_->int_tbl_prop_collector_factories(), output_compression_,
|
|
mutable_cf_options_.compression_opts, cfd_->GetID(), cfd_->GetName(),
|
|
0 /* level */, false /* is_bottommost */,
|
|
TableFileCreationReason::kFlush, creation_time, oldest_key_time,
|
|
current_time, db_id_, db_session_id_, 0 /* target_file_size */,
|
|
meta_.fd.GetNumber());
|
|
s = BuildTable(
|
|
dbname_, versions_, db_options_, tboptions, file_options_,
|
|
cfd_->table_cache(), iter.get(), std::move(range_del_iters), &meta_,
|
|
&blob_file_additions, existing_snapshots_,
|
|
earliest_write_conflict_snapshot_, snapshot_checker_,
|
|
mutable_cf_options_.paranoid_file_checks, cfd_->internal_stats(),
|
|
&io_s, io_tracer_, event_logger_, job_context_->job_id, Env::IO_HIGH,
|
|
&table_properties_, write_hint, full_history_ts_low, blob_callback_,
|
|
&num_input_entries, &memtable_payload_bytes, &memtable_garbage_bytes);
|
|
if (!io_s.ok()) {
|
|
io_status_ = io_s;
|
|
}
|
|
if (num_input_entries != total_num_entries && s.ok()) {
|
|
std::string msg = "Expected " + ToString(total_num_entries) +
|
|
" entries in memtables, but read " +
|
|
ToString(num_input_entries);
|
|
ROCKS_LOG_WARN(db_options_.info_log, "[%s] [JOB %d] Level-0 flush %s",
|
|
cfd_->GetName().c_str(), job_context_->job_id,
|
|
msg.c_str());
|
|
if (db_options_.flush_verify_memtable_count) {
|
|
s = Status::Corruption(msg);
|
|
}
|
|
}
|
|
if (tboptions.reason == TableFileCreationReason::kFlush) {
|
|
TEST_SYNC_POINT("DBImpl::FlushJob:Flush");
|
|
RecordTick(stats_, MEMTABLE_PAYLOAD_BYTES_AT_FLUSH,
|
|
memtable_payload_bytes);
|
|
RecordTick(stats_, MEMTABLE_GARBAGE_BYTES_AT_FLUSH,
|
|
memtable_garbage_bytes);
|
|
}
|
|
LogFlush(db_options_.info_log);
|
|
}
|
|
ROCKS_LOG_INFO(db_options_.info_log,
|
|
"[%s] [JOB %d] Level-0 flush table #%" PRIu64 ": %" PRIu64
|
|
" bytes %s"
|
|
"%s",
|
|
cfd_->GetName().c_str(), job_context_->job_id,
|
|
meta_.fd.GetNumber(), meta_.fd.GetFileSize(),
|
|
s.ToString().c_str(),
|
|
meta_.marked_for_compaction ? " (needs compaction)" : "");
|
|
|
|
if (s.ok() && output_file_directory_ != nullptr && sync_output_directory_) {
|
|
s = output_file_directory_->Fsync(IOOptions(), nullptr);
|
|
}
|
|
TEST_SYNC_POINT_CALLBACK("FlushJob::WriteLevel0Table", &mems_);
|
|
db_mutex_->Lock();
|
|
}
|
|
base_->Unref();
|
|
|
|
// Note that if file_size is zero, the file has been deleted and
|
|
// should not be added to the manifest.
|
|
const bool has_output = meta_.fd.GetFileSize() > 0;
|
|
|
|
if (s.ok() && has_output) {
|
|
TEST_SYNC_POINT("DBImpl::FlushJob:SSTFileCreated");
|
|
// if we have more than 1 background thread, then we cannot
|
|
// insert files directly into higher levels because some other
|
|
// threads could be concurrently producing compacted files for
|
|
// that key range.
|
|
// Add file to L0
|
|
edit_->AddFile(0 /* level */, meta_.fd.GetNumber(), meta_.fd.GetPathId(),
|
|
meta_.fd.GetFileSize(), meta_.smallest, meta_.largest,
|
|
meta_.fd.smallest_seqno, meta_.fd.largest_seqno,
|
|
meta_.marked_for_compaction, meta_.oldest_blob_file_number,
|
|
meta_.oldest_ancester_time, meta_.file_creation_time,
|
|
meta_.file_checksum, meta_.file_checksum_func_name);
|
|
|
|
edit_->SetBlobFileAdditions(std::move(blob_file_additions));
|
|
}
|
|
#ifndef ROCKSDB_LITE
|
|
// Piggyback FlushJobInfo on the first first flushed memtable.
|
|
mems_[0]->SetFlushJobInfo(GetFlushJobInfo());
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
// Note that here we treat flush as level 0 compaction in internal stats
|
|
InternalStats::CompactionStats stats(CompactionReason::kFlush, 1);
|
|
stats.micros = clock_->NowMicros() - start_micros;
|
|
stats.cpu_micros = clock_->CPUNanos() / 1000 - start_cpu_micros;
|
|
|
|
if (has_output) {
|
|
stats.bytes_written = meta_.fd.GetFileSize();
|
|
stats.num_output_files = 1;
|
|
}
|
|
|
|
const auto& blobs = edit_->GetBlobFileAdditions();
|
|
for (const auto& blob : blobs) {
|
|
stats.bytes_written_blob += blob.GetTotalBlobBytes();
|
|
}
|
|
|
|
stats.num_output_files_blob = static_cast<int>(blobs.size());
|
|
|
|
RecordTimeToHistogram(stats_, FLUSH_TIME, stats.micros);
|
|
cfd_->internal_stats()->AddCompactionStats(0 /* level */, thread_pri_, stats);
|
|
cfd_->internal_stats()->AddCFStats(
|
|
InternalStats::BYTES_FLUSHED,
|
|
stats.bytes_written + stats.bytes_written_blob);
|
|
RecordFlushIOStats();
|
|
return s;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
std::unique_ptr<FlushJobInfo> FlushJob::GetFlushJobInfo() const {
|
|
db_mutex_->AssertHeld();
|
|
std::unique_ptr<FlushJobInfo> info(new FlushJobInfo{});
|
|
info->cf_id = cfd_->GetID();
|
|
info->cf_name = cfd_->GetName();
|
|
|
|
const uint64_t file_number = meta_.fd.GetNumber();
|
|
info->file_path =
|
|
MakeTableFileName(cfd_->ioptions()->cf_paths[0].path, file_number);
|
|
info->file_number = file_number;
|
|
info->oldest_blob_file_number = meta_.oldest_blob_file_number;
|
|
info->thread_id = db_options_.env->GetThreadID();
|
|
info->job_id = job_context_->job_id;
|
|
info->smallest_seqno = meta_.fd.smallest_seqno;
|
|
info->largest_seqno = meta_.fd.largest_seqno;
|
|
info->table_properties = table_properties_;
|
|
info->flush_reason = cfd_->GetFlushReason();
|
|
return info;
|
|
}
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|