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34 lines
1.0 KiB
34 lines
1.0 KiB
1 year ago
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// 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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#pragma once
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#include <cstddef>
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#include <cstdint>
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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// struct ReadaheadFileInfo contains readahead information that is passed from
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// one file to another file per level during iterations. This information helps
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// iterators to carry forward the internal automatic prefetching readahead value
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// to next file during sequential reads instead of starting from the scratch.
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struct ReadaheadFileInfo {
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struct ReadaheadInfo {
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size_t readahead_size = 0;
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int64_t num_file_reads = 0;
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};
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// Used by Data block iterators to update readahead info.
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ReadaheadInfo data_block_readahead_info;
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// Used by Index block iterators to update readahead info.
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ReadaheadInfo index_block_readahead_info;
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};
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} // namespace ROCKSDB_NAMESPACE
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