1cfce430f1
Every table and sstable set keeps track of the total file size of contained sstables. Due to a feature request, we also want to keep track of the hypothetical file size if Data files were uncompressed, to add a metric that shows the compression ratio of sstables. We achieve this by replacing the relevant `uint_64 bytes_on_disk` counters everywhere with a struct that contains both the actual (post-compression) size and the hypothetical pre-compression size. This patch isn't supposed to change any observable behavior. In the next patch, we will use these changes to add a new metric.
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
/*
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* Copyright (C) 2025-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <cstdint>
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namespace sstables {
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struct file_size_stats {
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// Actual size of files on disk.
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// In particular, for compressed sstables, this includes the post-compression size of data files.
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int64_t on_disk = 0;
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// The hypothetical size of files on disk if the data files were uncompressed.
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// (Not fully accurate. This is equivalent to `on_disk - physical_data_db_size + logical_data_db_size`.
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// For full accuracy, we would have to account for the replacement of CompressionInfo.db with CRC.db, etc.
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// We don't bother with that. This value is only used for estimation and metrics anyway).
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int64_t before_compression = 0;
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file_size_stats& operator+=(const file_size_stats& other) {
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on_disk += other.on_disk;
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before_compression += other.before_compression;
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return *this;
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}
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file_size_stats& operator-=(const file_size_stats& other) {
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on_disk -= other.on_disk;
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before_compression -= other.before_compression;
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return *this;
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}
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friend file_size_stats operator+(const file_size_stats& lhs, const file_size_stats& rhs) {
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file_size_stats result = lhs;
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result += rhs;
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return result;
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}
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bool operator==(const file_size_stats& other) const = default;
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};
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} // namespace sstables
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