fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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712 lines
27 KiB
712 lines
27 KiB
// 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/table_cache.h"
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#include "db/dbformat.h"
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#include "db/range_tombstone_fragmenter.h"
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#include "db/snapshot_impl.h"
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#include "db/version_edit.h"
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#include "file/file_util.h"
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#include "file/filename.h"
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#include "file/random_access_file_reader.h"
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#include "monitoring/perf_context_imp.h"
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#include "rocksdb/advanced_options.h"
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#include "rocksdb/statistics.h"
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#include "table/block_based/block_based_table_reader.h"
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#include "table/get_context.h"
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#include "table/internal_iterator.h"
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#include "table/iterator_wrapper.h"
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#include "table/multiget_context.h"
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#include "table/table_builder.h"
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#include "table/table_reader.h"
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#include "test_util/sync_point.h"
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#include "util/cast_util.h"
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#include "util/coding.h"
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#include "util/stop_watch.h"
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// Generate the regular and coroutine versions of some methods by
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// including table_cache_sync_and_async.h twice
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// Macros in the header will expand differently based on whether
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// WITH_COROUTINES or WITHOUT_COROUTINES is defined
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// clang-format off
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#define WITHOUT_COROUTINES
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#include "db/table_cache_sync_and_async.h"
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#undef WITHOUT_COROUTINES
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#define WITH_COROUTINES
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#include "db/table_cache_sync_and_async.h"
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#undef WITH_COROUTINES
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// clang-format on
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namespace ROCKSDB_NAMESPACE {
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namespace {
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static Slice GetSliceForFileNumber(const uint64_t* file_number) {
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return Slice(reinterpret_cast<const char*>(file_number),
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sizeof(*file_number));
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}
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void AppendVarint64(IterKey* key, uint64_t v) {
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char buf[10];
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auto ptr = EncodeVarint64(buf, v);
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key->TrimAppend(key->Size(), buf, ptr - buf);
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}
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} // anonymous namespace
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const int kLoadConcurency = 128;
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TableCache::TableCache(const ImmutableOptions& ioptions,
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const FileOptions* file_options, Cache* const cache,
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BlockCacheTracer* const block_cache_tracer,
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const std::shared_ptr<IOTracer>& io_tracer,
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const std::string& db_session_id)
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: ioptions_(ioptions),
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file_options_(*file_options),
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cache_(cache),
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immortal_tables_(false),
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block_cache_tracer_(block_cache_tracer),
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loader_mutex_(kLoadConcurency),
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io_tracer_(io_tracer),
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db_session_id_(db_session_id) {
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if (ioptions_.row_cache) {
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// If the same cache is shared by multiple instances, we need to
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// disambiguate its entries.
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PutVarint64(&row_cache_id_, ioptions_.row_cache->NewId());
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}
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}
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TableCache::~TableCache() {}
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Status TableCache::GetTableReader(
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const ReadOptions& ro, const FileOptions& file_options,
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const InternalKeyComparator& internal_comparator,
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const FileMetaData& file_meta, bool sequential_mode,
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uint8_t block_protection_bytes_per_key, HistogramImpl* file_read_hist,
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std::unique_ptr<TableReader>* table_reader,
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const std::shared_ptr<const SliceTransform>& prefix_extractor,
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bool skip_filters, int level, bool prefetch_index_and_filter_in_cache,
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size_t max_file_size_for_l0_meta_pin, Temperature file_temperature) {
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std::string fname = TableFileName(
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ioptions_.cf_paths, file_meta.fd.GetNumber(), file_meta.fd.GetPathId());
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std::unique_ptr<FSRandomAccessFile> file;
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FileOptions fopts = file_options;
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fopts.temperature = file_temperature;
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Status s = PrepareIOFromReadOptions(ro, ioptions_.clock, fopts.io_options);
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TEST_SYNC_POINT_CALLBACK("TableCache::GetTableReader:BeforeOpenFile",
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const_cast<Status*>(&s));
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if (s.ok()) {
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s = ioptions_.fs->NewRandomAccessFile(fname, fopts, &file, nullptr);
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}
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if (s.ok()) {
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RecordTick(ioptions_.stats, NO_FILE_OPENS);
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} else if (s.IsPathNotFound()) {
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fname = Rocks2LevelTableFileName(fname);
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// If this file is also not found, we want to use the error message
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// that contains the table file name which is less confusing.
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Status temp_s =
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PrepareIOFromReadOptions(ro, ioptions_.clock, fopts.io_options);
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if (temp_s.ok()) {
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temp_s = ioptions_.fs->NewRandomAccessFile(fname, file_options, &file,
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nullptr);
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}
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if (temp_s.ok()) {
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RecordTick(ioptions_.stats, NO_FILE_OPENS);
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s = temp_s;
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}
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}
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if (s.ok()) {
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if (!sequential_mode && ioptions_.advise_random_on_open) {
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file->Hint(FSRandomAccessFile::kRandom);
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}
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StopWatch sw(ioptions_.clock, ioptions_.stats, TABLE_OPEN_IO_MICROS);
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std::unique_ptr<RandomAccessFileReader> file_reader(
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new RandomAccessFileReader(std::move(file), fname, ioptions_.clock,
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io_tracer_, ioptions_.stats, SST_READ_MICROS,
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file_read_hist, ioptions_.rate_limiter.get(),
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ioptions_.listeners, file_temperature,
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level == ioptions_.num_levels - 1));
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UniqueId64x2 expected_unique_id;
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if (ioptions_.verify_sst_unique_id_in_manifest) {
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expected_unique_id = file_meta.unique_id;
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} else {
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expected_unique_id = kNullUniqueId64x2; // null ID == no verification
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}
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s = ioptions_.table_factory->NewTableReader(
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ro,
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TableReaderOptions(
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ioptions_, prefix_extractor, file_options, internal_comparator,
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block_protection_bytes_per_key, skip_filters, immortal_tables_,
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false /* force_direct_prefetch */, level, block_cache_tracer_,
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max_file_size_for_l0_meta_pin, db_session_id_,
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file_meta.fd.GetNumber(), expected_unique_id,
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file_meta.fd.largest_seqno, file_meta.tail_size,
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file_meta.user_defined_timestamps_persisted),
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std::move(file_reader), file_meta.fd.GetFileSize(), table_reader,
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prefetch_index_and_filter_in_cache);
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TEST_SYNC_POINT("TableCache::GetTableReader:0");
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}
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return s;
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}
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Status TableCache::FindTable(
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const ReadOptions& ro, const FileOptions& file_options,
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const InternalKeyComparator& internal_comparator,
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const FileMetaData& file_meta, TypedHandle** handle,
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uint8_t block_protection_bytes_per_key,
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const std::shared_ptr<const SliceTransform>& prefix_extractor,
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const bool no_io, HistogramImpl* file_read_hist, bool skip_filters,
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int level, bool prefetch_index_and_filter_in_cache,
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size_t max_file_size_for_l0_meta_pin, Temperature file_temperature) {
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PERF_TIMER_GUARD_WITH_CLOCK(find_table_nanos, ioptions_.clock);
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uint64_t number = file_meta.fd.GetNumber();
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Slice key = GetSliceForFileNumber(&number);
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*handle = cache_.Lookup(key);
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TEST_SYNC_POINT_CALLBACK("TableCache::FindTable:0",
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const_cast<bool*>(&no_io));
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if (*handle == nullptr) {
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if (no_io) {
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return Status::Incomplete("Table not found in table_cache, no_io is set");
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}
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MutexLock load_lock(&loader_mutex_.Get(key));
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// We check the cache again under loading mutex
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*handle = cache_.Lookup(key);
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if (*handle != nullptr) {
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return Status::OK();
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}
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std::unique_ptr<TableReader> table_reader;
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Status s = GetTableReader(ro, file_options, internal_comparator, file_meta,
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false /* sequential mode */,
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block_protection_bytes_per_key, file_read_hist,
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&table_reader, prefix_extractor, skip_filters,
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level, prefetch_index_and_filter_in_cache,
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max_file_size_for_l0_meta_pin, file_temperature);
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if (!s.ok()) {
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assert(table_reader == nullptr);
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RecordTick(ioptions_.stats, NO_FILE_ERRORS);
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// We do not cache error results so that if the error is transient,
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// or somebody repairs the file, we recover automatically.
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} else {
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s = cache_.Insert(key, table_reader.get(), 1, handle);
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if (s.ok()) {
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// Release ownership of table reader.
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table_reader.release();
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}
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}
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return s;
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}
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return Status::OK();
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}
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InternalIterator* TableCache::NewIterator(
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const ReadOptions& options, const FileOptions& file_options,
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const InternalKeyComparator& icomparator, const FileMetaData& file_meta,
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RangeDelAggregator* range_del_agg,
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const std::shared_ptr<const SliceTransform>& prefix_extractor,
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TableReader** table_reader_ptr, HistogramImpl* file_read_hist,
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TableReaderCaller caller, Arena* arena, bool skip_filters, int level,
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size_t max_file_size_for_l0_meta_pin,
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const InternalKey* smallest_compaction_key,
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const InternalKey* largest_compaction_key, bool allow_unprepared_value,
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uint8_t block_protection_bytes_per_key,
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TruncatedRangeDelIterator** range_del_iter) {
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PERF_TIMER_GUARD(new_table_iterator_nanos);
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Status s;
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TableReader* table_reader = nullptr;
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TypedHandle* handle = nullptr;
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if (table_reader_ptr != nullptr) {
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*table_reader_ptr = nullptr;
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}
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bool for_compaction = caller == TableReaderCaller::kCompaction;
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auto& fd = file_meta.fd;
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table_reader = fd.table_reader;
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if (table_reader == nullptr) {
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s = FindTable(options, file_options, icomparator, file_meta, &handle,
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block_protection_bytes_per_key, prefix_extractor,
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options.read_tier == kBlockCacheTier /* no_io */,
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file_read_hist, skip_filters, level,
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true /* prefetch_index_and_filter_in_cache */,
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max_file_size_for_l0_meta_pin, file_meta.temperature);
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if (s.ok()) {
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table_reader = cache_.Value(handle);
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}
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}
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InternalIterator* result = nullptr;
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if (s.ok()) {
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if (options.table_filter &&
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!options.table_filter(*table_reader->GetTableProperties())) {
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result = NewEmptyInternalIterator<Slice>(arena);
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} else {
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result = table_reader->NewIterator(
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options, prefix_extractor.get(), arena, skip_filters, caller,
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file_options.compaction_readahead_size, allow_unprepared_value);
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}
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if (handle != nullptr) {
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cache_.RegisterReleaseAsCleanup(handle, *result);
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handle = nullptr; // prevent from releasing below
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}
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if (for_compaction) {
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table_reader->SetupForCompaction();
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}
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if (table_reader_ptr != nullptr) {
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*table_reader_ptr = table_reader;
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}
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}
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if (s.ok() && !options.ignore_range_deletions) {
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if (range_del_iter != nullptr) {
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auto new_range_del_iter =
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table_reader->NewRangeTombstoneIterator(options);
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if (new_range_del_iter == nullptr || new_range_del_iter->empty()) {
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delete new_range_del_iter;
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*range_del_iter = nullptr;
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} else {
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*range_del_iter = new TruncatedRangeDelIterator(
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std::unique_ptr<FragmentedRangeTombstoneIterator>(
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new_range_del_iter),
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&icomparator, &file_meta.smallest, &file_meta.largest);
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}
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}
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if (range_del_agg != nullptr) {
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if (range_del_agg->AddFile(fd.GetNumber())) {
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std::unique_ptr<FragmentedRangeTombstoneIterator> new_range_del_iter(
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static_cast<FragmentedRangeTombstoneIterator*>(
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table_reader->NewRangeTombstoneIterator(options)));
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if (new_range_del_iter != nullptr) {
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s = new_range_del_iter->status();
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}
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if (s.ok()) {
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const InternalKey* smallest = &file_meta.smallest;
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const InternalKey* largest = &file_meta.largest;
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if (smallest_compaction_key != nullptr) {
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smallest = smallest_compaction_key;
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}
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if (largest_compaction_key != nullptr) {
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largest = largest_compaction_key;
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}
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range_del_agg->AddTombstones(std::move(new_range_del_iter), smallest,
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largest);
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}
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}
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}
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}
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if (handle != nullptr) {
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cache_.Release(handle);
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}
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if (!s.ok()) {
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assert(result == nullptr);
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result = NewErrorInternalIterator<Slice>(s, arena);
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}
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return result;
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}
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Status TableCache::GetRangeTombstoneIterator(
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const ReadOptions& options,
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const InternalKeyComparator& internal_comparator,
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const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
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std::unique_ptr<FragmentedRangeTombstoneIterator>* out_iter) {
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assert(out_iter);
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const FileDescriptor& fd = file_meta.fd;
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Status s;
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TableReader* t = fd.table_reader;
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TypedHandle* handle = nullptr;
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if (t == nullptr) {
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s = FindTable(options, file_options_, internal_comparator, file_meta,
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&handle, block_protection_bytes_per_key);
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if (s.ok()) {
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t = cache_.Value(handle);
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}
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}
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if (s.ok()) {
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// Note: NewRangeTombstoneIterator could return nullptr
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out_iter->reset(t->NewRangeTombstoneIterator(options));
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}
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if (handle) {
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if (*out_iter) {
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cache_.RegisterReleaseAsCleanup(handle, **out_iter);
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} else {
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cache_.Release(handle);
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}
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}
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return s;
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}
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void TableCache::CreateRowCacheKeyPrefix(const ReadOptions& options,
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const FileDescriptor& fd,
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const Slice& internal_key,
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GetContext* get_context,
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IterKey& row_cache_key) {
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uint64_t fd_number = fd.GetNumber();
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// We use the user key as cache key instead of the internal key,
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// otherwise the whole cache would be invalidated every time the
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// sequence key increases. However, to support caching snapshot
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// reads, we append the sequence number (incremented by 1 to
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// distinguish from 0) only in this case.
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// If the snapshot is larger than the largest seqno in the file,
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// all data should be exposed to the snapshot, so we treat it
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// the same as there is no snapshot. The exception is that if
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// a seq-checking callback is registered, some internal keys
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// may still be filtered out.
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uint64_t seq_no = 0;
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// Maybe we can include the whole file ifsnapshot == fd.largest_seqno.
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if (options.snapshot != nullptr &&
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(get_context->has_callback() ||
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static_cast_with_check<const SnapshotImpl>(options.snapshot)
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->GetSequenceNumber() <= fd.largest_seqno)) {
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// We should consider to use options.snapshot->GetSequenceNumber()
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// instead of GetInternalKeySeqno(k), which will make the code
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// easier to understand.
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seq_no = 1 + GetInternalKeySeqno(internal_key);
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}
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// Compute row cache key.
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row_cache_key.TrimAppend(row_cache_key.Size(), row_cache_id_.data(),
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row_cache_id_.size());
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AppendVarint64(&row_cache_key, fd_number);
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AppendVarint64(&row_cache_key, seq_no);
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}
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bool TableCache::GetFromRowCache(const Slice& user_key, IterKey& row_cache_key,
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size_t prefix_size, GetContext* get_context) {
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bool found = false;
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row_cache_key.TrimAppend(prefix_size, user_key.data(), user_key.size());
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RowCacheInterface row_cache{ioptions_.row_cache.get()};
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if (auto row_handle = row_cache.Lookup(row_cache_key.GetUserKey())) {
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// Cleanable routine to release the cache entry
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Cleanable value_pinner;
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// If it comes here value is located on the cache.
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// found_row_cache_entry points to the value on cache,
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// and value_pinner has cleanup procedure for the cached entry.
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// After replayGetContextLog() returns, get_context.pinnable_slice_
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// will point to cache entry buffer (or a copy based on that) and
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// cleanup routine under value_pinner will be delegated to
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// get_context.pinnable_slice_. Cache entry is released when
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// get_context.pinnable_slice_ is reset.
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row_cache.RegisterReleaseAsCleanup(row_handle, value_pinner);
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replayGetContextLog(*row_cache.Value(row_handle), user_key, get_context,
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&value_pinner);
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RecordTick(ioptions_.stats, ROW_CACHE_HIT);
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found = true;
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} else {
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RecordTick(ioptions_.stats, ROW_CACHE_MISS);
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}
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return found;
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}
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Status TableCache::Get(
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const ReadOptions& options,
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const InternalKeyComparator& internal_comparator,
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const FileMetaData& file_meta, const Slice& k, GetContext* get_context,
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uint8_t block_protection_bytes_per_key,
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const std::shared_ptr<const SliceTransform>& prefix_extractor,
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HistogramImpl* file_read_hist, bool skip_filters, int level,
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size_t max_file_size_for_l0_meta_pin) {
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auto& fd = file_meta.fd;
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std::string* row_cache_entry = nullptr;
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bool done = false;
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IterKey row_cache_key;
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std::string row_cache_entry_buffer;
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// Check row cache if enabled. Since row cache does not currently store
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// sequence numbers, we cannot use it if we need to fetch the sequence.
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if (ioptions_.row_cache && !get_context->NeedToReadSequence()) {
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auto user_key = ExtractUserKey(k);
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CreateRowCacheKeyPrefix(options, fd, k, get_context, row_cache_key);
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done = GetFromRowCache(user_key, row_cache_key, row_cache_key.Size(),
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get_context);
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if (!done) {
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row_cache_entry = &row_cache_entry_buffer;
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}
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}
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Status s;
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TableReader* t = fd.table_reader;
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TypedHandle* handle = nullptr;
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if (!done) {
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assert(s.ok());
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if (t == nullptr) {
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s = FindTable(options, file_options_, internal_comparator, file_meta,
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&handle, block_protection_bytes_per_key, prefix_extractor,
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|
options.read_tier == kBlockCacheTier /* no_io */,
|
|
file_read_hist, skip_filters, level,
|
|
true /* prefetch_index_and_filter_in_cache */,
|
|
max_file_size_for_l0_meta_pin, file_meta.temperature);
|
|
if (s.ok()) {
|
|
t = cache_.Value(handle);
|
|
}
|
|
}
|
|
SequenceNumber* max_covering_tombstone_seq =
|
|
get_context->max_covering_tombstone_seq();
|
|
if (s.ok() && max_covering_tombstone_seq != nullptr &&
|
|
!options.ignore_range_deletions) {
|
|
std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
|
|
t->NewRangeTombstoneIterator(options));
|
|
if (range_del_iter != nullptr) {
|
|
SequenceNumber seq =
|
|
range_del_iter->MaxCoveringTombstoneSeqnum(ExtractUserKey(k));
|
|
if (seq > *max_covering_tombstone_seq) {
|
|
*max_covering_tombstone_seq = seq;
|
|
if (get_context->NeedTimestamp()) {
|
|
get_context->SetTimestampFromRangeTombstone(
|
|
range_del_iter->timestamp());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
get_context->SetReplayLog(row_cache_entry); // nullptr if no cache.
|
|
s = t->Get(options, k, get_context, prefix_extractor.get(), skip_filters);
|
|
get_context->SetReplayLog(nullptr);
|
|
} else if (options.read_tier == kBlockCacheTier && s.IsIncomplete()) {
|
|
// Couldn't find Table in cache but treat as kFound if no_io set
|
|
get_context->MarkKeyMayExist();
|
|
s = Status::OK();
|
|
done = true;
|
|
}
|
|
}
|
|
|
|
// Put the replay log in row cache only if something was found.
|
|
if (!done && s.ok() && row_cache_entry && !row_cache_entry->empty()) {
|
|
RowCacheInterface row_cache{ioptions_.row_cache.get()};
|
|
size_t charge = row_cache_entry->capacity() + sizeof(std::string);
|
|
auto row_ptr = new std::string(std::move(*row_cache_entry));
|
|
// If row cache is full, it's OK to continue.
|
|
row_cache.Insert(row_cache_key.GetUserKey(), row_ptr, charge)
|
|
.PermitUncheckedError();
|
|
}
|
|
|
|
if (handle != nullptr) {
|
|
cache_.Release(handle);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void TableCache::UpdateRangeTombstoneSeqnums(
|
|
const ReadOptions& options, TableReader* t,
|
|
MultiGetContext::Range& table_range) {
|
|
std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
|
|
t->NewRangeTombstoneIterator(options));
|
|
if (range_del_iter != nullptr) {
|
|
for (auto iter = table_range.begin(); iter != table_range.end(); ++iter) {
|
|
SequenceNumber* max_covering_tombstone_seq =
|
|
iter->get_context->max_covering_tombstone_seq();
|
|
SequenceNumber seq =
|
|
range_del_iter->MaxCoveringTombstoneSeqnum(iter->ukey_with_ts);
|
|
if (seq > *max_covering_tombstone_seq) {
|
|
*max_covering_tombstone_seq = seq;
|
|
if (iter->get_context->NeedTimestamp()) {
|
|
iter->get_context->SetTimestampFromRangeTombstone(
|
|
range_del_iter->timestamp());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Status TableCache::MultiGetFilter(
|
|
const ReadOptions& options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileMetaData& file_meta,
|
|
const std::shared_ptr<const SliceTransform>& prefix_extractor,
|
|
HistogramImpl* file_read_hist, int level,
|
|
MultiGetContext::Range* mget_range, TypedHandle** table_handle,
|
|
uint8_t block_protection_bytes_per_key) {
|
|
auto& fd = file_meta.fd;
|
|
IterKey row_cache_key;
|
|
std::string row_cache_entry_buffer;
|
|
|
|
// Check if we need to use the row cache. If yes, then we cannot do the
|
|
// filtering here, since the filtering needs to happen after the row cache
|
|
// lookup.
|
|
KeyContext& first_key = *mget_range->begin();
|
|
if (ioptions_.row_cache && !first_key.get_context->NeedToReadSequence()) {
|
|
return Status::NotSupported();
|
|
}
|
|
Status s;
|
|
TableReader* t = fd.table_reader;
|
|
TypedHandle* handle = nullptr;
|
|
MultiGetContext::Range tombstone_range(*mget_range, mget_range->begin(),
|
|
mget_range->end());
|
|
if (t == nullptr) {
|
|
s = FindTable(options, file_options_, internal_comparator, file_meta,
|
|
&handle, block_protection_bytes_per_key, prefix_extractor,
|
|
options.read_tier == kBlockCacheTier /* no_io */,
|
|
file_read_hist,
|
|
/*skip_filters=*/false, level,
|
|
true /* prefetch_index_and_filter_in_cache */,
|
|
/*max_file_size_for_l0_meta_pin=*/0, file_meta.temperature);
|
|
if (s.ok()) {
|
|
t = cache_.Value(handle);
|
|
}
|
|
*table_handle = handle;
|
|
}
|
|
if (s.ok()) {
|
|
s = t->MultiGetFilter(options, prefix_extractor.get(), mget_range);
|
|
}
|
|
if (s.ok() && !options.ignore_range_deletions) {
|
|
// Update the range tombstone sequence numbers for the keys here
|
|
// as TableCache::MultiGet may or may not be called, and even if it
|
|
// is, it may be called with fewer keys in the rangedue to filtering.
|
|
UpdateRangeTombstoneSeqnums(options, t, tombstone_range);
|
|
}
|
|
if (mget_range->empty() && handle) {
|
|
cache_.Release(handle);
|
|
*table_handle = nullptr;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status TableCache::GetTableProperties(
|
|
const FileOptions& file_options, const ReadOptions& read_options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileMetaData& file_meta,
|
|
std::shared_ptr<const TableProperties>* properties,
|
|
uint8_t block_protection_bytes_per_key,
|
|
const std::shared_ptr<const SliceTransform>& prefix_extractor, bool no_io) {
|
|
auto table_reader = file_meta.fd.table_reader;
|
|
// table already been pre-loaded?
|
|
if (table_reader) {
|
|
*properties = table_reader->GetTableProperties();
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
TypedHandle* table_handle = nullptr;
|
|
Status s = FindTable(read_options, file_options, internal_comparator,
|
|
file_meta, &table_handle, block_protection_bytes_per_key,
|
|
prefix_extractor, no_io);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
assert(table_handle);
|
|
auto table = cache_.Value(table_handle);
|
|
*properties = table->GetTableProperties();
|
|
cache_.Release(table_handle);
|
|
return s;
|
|
}
|
|
|
|
Status TableCache::ApproximateKeyAnchors(
|
|
const ReadOptions& ro, const InternalKeyComparator& internal_comparator,
|
|
const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
|
|
std::vector<TableReader::Anchor>& anchors) {
|
|
Status s;
|
|
TableReader* t = file_meta.fd.table_reader;
|
|
TypedHandle* handle = nullptr;
|
|
if (t == nullptr) {
|
|
s = FindTable(ro, file_options_, internal_comparator, file_meta, &handle,
|
|
block_protection_bytes_per_key);
|
|
if (s.ok()) {
|
|
t = cache_.Value(handle);
|
|
}
|
|
}
|
|
if (s.ok() && t != nullptr) {
|
|
s = t->ApproximateKeyAnchors(ro, anchors);
|
|
}
|
|
if (handle != nullptr) {
|
|
cache_.Release(handle);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
size_t TableCache::GetMemoryUsageByTableReader(
|
|
const FileOptions& file_options, const ReadOptions& read_options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileMetaData& file_meta, uint8_t block_protection_bytes_per_key,
|
|
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
|
|
auto table_reader = file_meta.fd.table_reader;
|
|
// table already been pre-loaded?
|
|
if (table_reader) {
|
|
return table_reader->ApproximateMemoryUsage();
|
|
}
|
|
|
|
TypedHandle* table_handle = nullptr;
|
|
Status s = FindTable(read_options, file_options, internal_comparator,
|
|
file_meta, &table_handle, block_protection_bytes_per_key,
|
|
prefix_extractor, true /* no_io */);
|
|
if (!s.ok()) {
|
|
return 0;
|
|
}
|
|
assert(table_handle);
|
|
auto table = cache_.Value(table_handle);
|
|
auto ret = table->ApproximateMemoryUsage();
|
|
cache_.Release(table_handle);
|
|
return ret;
|
|
}
|
|
|
|
void TableCache::Evict(Cache* cache, uint64_t file_number) {
|
|
cache->Erase(GetSliceForFileNumber(&file_number));
|
|
}
|
|
|
|
uint64_t TableCache::ApproximateOffsetOf(
|
|
const ReadOptions& read_options, const Slice& key,
|
|
const FileMetaData& file_meta, TableReaderCaller caller,
|
|
const InternalKeyComparator& internal_comparator,
|
|
uint8_t block_protection_bytes_per_key,
|
|
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
|
|
uint64_t result = 0;
|
|
TableReader* table_reader = file_meta.fd.table_reader;
|
|
TypedHandle* table_handle = nullptr;
|
|
if (table_reader == nullptr) {
|
|
Status s =
|
|
FindTable(read_options, file_options_, internal_comparator, file_meta,
|
|
&table_handle, block_protection_bytes_per_key,
|
|
prefix_extractor, false /* no_io */);
|
|
if (s.ok()) {
|
|
table_reader = cache_.Value(table_handle);
|
|
}
|
|
}
|
|
|
|
if (table_reader != nullptr) {
|
|
result = table_reader->ApproximateOffsetOf(read_options, key, caller);
|
|
}
|
|
if (table_handle != nullptr) {
|
|
cache_.Release(table_handle);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
uint64_t TableCache::ApproximateSize(
|
|
const ReadOptions& read_options, const Slice& start, const Slice& end,
|
|
const FileMetaData& file_meta, TableReaderCaller caller,
|
|
const InternalKeyComparator& internal_comparator,
|
|
uint8_t block_protection_bytes_per_key,
|
|
const std::shared_ptr<const SliceTransform>& prefix_extractor) {
|
|
uint64_t result = 0;
|
|
TableReader* table_reader = file_meta.fd.table_reader;
|
|
TypedHandle* table_handle = nullptr;
|
|
if (table_reader == nullptr) {
|
|
Status s =
|
|
FindTable(read_options, file_options_, internal_comparator, file_meta,
|
|
&table_handle, block_protection_bytes_per_key,
|
|
prefix_extractor, false /* no_io */);
|
|
if (s.ok()) {
|
|
table_reader = cache_.Value(table_handle);
|
|
}
|
|
}
|
|
|
|
if (table_reader != nullptr) {
|
|
result = table_reader->ApproximateSize(read_options, start, end, caller);
|
|
}
|
|
if (table_handle != nullptr) {
|
|
cache_.Release(table_handle);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|