9a5886bd8c
Summary: Current implementation of the ```read_options.deadline``` option only checks the deadline for random file reads during point lookups. This PR extends the checks to file opens, prefetches and preloads as part of table open. The main changes are in the ```BlockBasedTable```, partitioned index and filter readers, and ```TableCache``` to take ReadOptions as an additional parameter. In ```BlockBasedTable::Open```, in order to retain existing behavior w.r.t checksum verification and block cache usage, we filter out most of the options in ```ReadOptions``` except ```deadline```. However, having the ```ReadOptions``` gives us more flexibility to honor other options like verify_checksums, fill_cache etc. in the future. Additional changes in callsites due to function signature changes in ```NewTableReader()``` and ```FilePrefetchBuffer```. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6982 Test Plan: Add new unit tests in db_basic_test Reviewed By: riversand963 Differential Revision: D22219515 Pulled By: anand1976 fbshipit-source-id: 8a3b92f4a889808013838603aa3ca35229cd501b
60 lines
2.0 KiB
C++
60 lines
2.0 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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#pragma once
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#include <cassert>
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#include "table/block_based/cachable_entry.h"
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#include "table/format.h"
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namespace ROCKSDB_NAMESPACE {
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class BlockBasedTable;
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struct BlockCacheLookupContext;
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class FilePrefetchBuffer;
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class GetContext;
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struct ReadOptions;
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struct UncompressionDict;
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// Provides access to the uncompression dictionary 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 UncompressionDictReader {
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public:
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static Status Create(
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const BlockBasedTable* table, const ReadOptions& ro,
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FilePrefetchBuffer* prefetch_buffer, bool use_cache, bool prefetch,
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bool pin, BlockCacheLookupContext* lookup_context,
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std::unique_ptr<UncompressionDictReader>* uncompression_dict_reader);
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Status GetOrReadUncompressionDictionary(
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FilePrefetchBuffer* prefetch_buffer, bool no_io, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<UncompressionDict>* uncompression_dict) const;
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size_t ApproximateMemoryUsage() const;
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private:
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UncompressionDictReader(const BlockBasedTable* t,
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CachableEntry<UncompressionDict>&& uncompression_dict)
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: table_(t), uncompression_dict_(std::move(uncompression_dict)) {
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assert(table_);
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}
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bool cache_dictionary_blocks() const;
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static Status ReadUncompressionDictionary(
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const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
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const ReadOptions& read_options, bool use_cache, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<UncompressionDict>* uncompression_dict);
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const BlockBasedTable* table_;
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CachableEntry<UncompressionDict> uncompression_dict_;
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};
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} // namespace ROCKSDB_NAMESPACE
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