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b45738622a
Summary: This is mostly taken from https://github.com/facebook/rocksdb/issues/10427 with my own comments addressed. This PR plumbs the user’s `ReadOptions` down to `GetOrReadIndexBlock()`, `GetOrReadFilterBlock()`, and `GetFilterPartitionBlock()`. Now those functions no longer have to make up a `ReadOptions` with incomplete information. I also let `PartitionIndexReader::NewIterator()` pass through its caller's `ReadOptions::verify_checksums`, which was inexplicably dropped previously. Fixes https://github.com/facebook/rocksdb/issues/10463 Pull Request resolved: https://github.com/facebook/rocksdb/pull/11208 Test Plan: Functional: - Measured `-verify_checksum=false` applies to metadata blocks read outside of table open - setup command: `TEST_TMPDIR=/tmp/100M-DB/ ./db_bench -benchmarks=filluniquerandom,waitforcompaction -write_buffer_size=1048576 -target_file_size_base=1048576 -max_bytes_for_level_base=4194304 -compression_type=none -num=1638400 -key_size=8 -value_size=56` - run command: `TEST_TMPDIR=/tmp/100M-DB/ ./db_bench -benchmarks=readrandom -use_existing_db=true -write_buffer_size=1048576 -target_file_size_base=1048576 -max_bytes_for_level_base=4194304 -compression_type=none -num=1638400 -key_size=8 -value_size=56 -duration=10 -threads=32 -cache_size=131072 -statistics=true -verify_checksum=false -open_files=20 -cache_index_and_filter_blocks=true` - before: `rocksdb.block.checksum.compute.count COUNT : 384353` - after: `rocksdb.block.checksum.compute.count COUNT : 22` Performance: - Setup command (tmpfs, 128MB logical data size, cache indexes/filters without pinning so index/filter lookups go through table reader): `TEST_TMPDIR=/dev/shm/128M-DB/ ./db_bench -benchmarks=filluniquerandom,waitforcompaction -write_buffer_size=131072 -target_file_size_base=131072 -max_bytes_for_level_base=524288 -compression_type=none -num=4194304 -key_size=8 -value_size=24 -bloom_bits=8 -whole_key_filtering=1` - Measured point lookup performance. Database is fully cached to emphasize any new callstack overheads - Command: `TEST_TMPDIR=/dev/shm/128M-DB/ ./db_bench -benchmarks=readrandom[-W1][-X20] -use_existing_db=true -cache_index_and_filter_blocks=true -disable_auto_compactions=true -num=4194304 -key_size=8 -value_size=24 -bloom_bits=8 -whole_key_filtering=1 -duration=10 -cache_size=1048576000` - Before: `readrandom [AVG 20 runs] : 274848 (± 3717) ops/sec; 8.4 (± 0.1) MB/sec` - After: `readrandom [AVG 20 runs] : 277904 (± 4474) ops/sec; 8.5 (± 0.1) MB/sec` Reviewed By: hx235 Differential Revision: D43145366 Pulled By: ajkr fbshipit-source-id: 75ec062ece86a82cd788783de9de2c72df57f994
86 lines
3.1 KiB
C++
86 lines
3.1 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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#pragma once
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#include "table/block_based/block_based_table_reader.h"
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#include "table/block_based/reader_common.h"
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namespace ROCKSDB_NAMESPACE {
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// Encapsulates common functionality for the various index reader
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// implementations. Provides access to the index block regardless of whether
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// it is owned by the reader or stored in the cache, or whether it is pinned
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// in the cache or not.
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class BlockBasedTable::IndexReaderCommon : public BlockBasedTable::IndexReader {
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public:
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IndexReaderCommon(const BlockBasedTable* t,
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CachableEntry<Block>&& index_block)
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: table_(t), index_block_(std::move(index_block)) {
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assert(table_ != nullptr);
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}
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protected:
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static Status ReadIndexBlock(const BlockBasedTable* table,
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FilePrefetchBuffer* prefetch_buffer,
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const ReadOptions& read_options, bool use_cache,
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GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<Block>* index_block);
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const BlockBasedTable* table() const { return table_; }
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const InternalKeyComparator* internal_comparator() const {
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assert(table_ != nullptr);
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assert(table_->get_rep() != nullptr);
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return &table_->get_rep()->internal_comparator;
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}
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bool index_has_first_key() const {
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assert(table_ != nullptr);
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assert(table_->get_rep() != nullptr);
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return table_->get_rep()->index_has_first_key;
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}
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bool index_key_includes_seq() const {
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assert(table_ != nullptr);
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assert(table_->get_rep() != nullptr);
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return table_->get_rep()->index_key_includes_seq;
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}
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bool index_value_is_full() const {
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assert(table_ != nullptr);
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assert(table_->get_rep() != nullptr);
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return table_->get_rep()->index_value_is_full;
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}
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bool cache_index_blocks() const {
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assert(table_ != nullptr);
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assert(table_->get_rep() != nullptr);
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return table_->get_rep()->table_options.cache_index_and_filter_blocks;
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}
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Status GetOrReadIndexBlock(bool no_io, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<Block>* index_block,
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const ReadOptions& read_options) const;
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size_t ApproximateIndexBlockMemoryUsage() const {
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assert(!index_block_.GetOwnValue() || index_block_.GetValue() != nullptr);
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return index_block_.GetOwnValue()
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? index_block_.GetValue()->ApproximateMemoryUsage()
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: 0;
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}
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private:
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const BlockBasedTable* table_;
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CachableEntry<Block> index_block_;
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};
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} // namespace ROCKSDB_NAMESPACE
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