fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph
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88 lines
3.5 KiB
88 lines
3.5 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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#pragma once
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#include <atomic>
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#include <memory>
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#include "rocksdb/table_properties.h"
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namespace ROCKSDB_NAMESPACE {
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// A factory of a table property collector that marks a SST
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// file as need-compaction when it observe at least "D" deletion
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// entries in any "N" consecutive entries or the ratio of tombstone
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// entries in the whole file >= the specified deletion ratio.
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class CompactOnDeletionCollectorFactory
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: public TablePropertiesCollectorFactory {
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public:
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// A factory of a table property collector that marks a SST
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// file as need-compaction when it observe at least "D" deletion
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// entries in any "N" consecutive entries, or the ratio of tombstone
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// entries >= deletion_ratio.
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//
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// @param sliding_window_size "N"
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// @param deletion_trigger "D"
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// @param deletion_ratio, if <= 0 or > 1, disable triggering compaction
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// based on deletion ratio.
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CompactOnDeletionCollectorFactory(size_t sliding_window_size,
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size_t deletion_trigger,
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double deletion_ratio);
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~CompactOnDeletionCollectorFactory() {}
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TablePropertiesCollector* CreateTablePropertiesCollector(
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TablePropertiesCollectorFactory::Context context) override;
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// Change the value of sliding_window_size "N"
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// Setting it to 0 disables the delete triggered compaction
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void SetWindowSize(size_t sliding_window_size) {
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sliding_window_size_.store(sliding_window_size);
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}
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size_t GetWindowSize() const { return sliding_window_size_.load(); }
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// Change the value of deletion_trigger "D"
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void SetDeletionTrigger(size_t deletion_trigger) {
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deletion_trigger_.store(deletion_trigger);
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}
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size_t GetDeletionTrigger() const { return deletion_trigger_.load(); }
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// Change deletion ratio.
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// @param deletion_ratio, if <= 0 or > 1, disable triggering compaction
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// based on deletion ratio.
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void SetDeletionRatio(double deletion_ratio) {
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deletion_ratio_.store(deletion_ratio);
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}
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double GetDeletionRatio() const { return deletion_ratio_.load(); }
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static const char* kClassName() { return "CompactOnDeletionCollector"; }
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const char* Name() const override { return kClassName(); }
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std::string ToString() const override;
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private:
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std::atomic<size_t> sliding_window_size_;
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std::atomic<size_t> deletion_trigger_;
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std::atomic<double> deletion_ratio_;
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};
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// Creates a factory of a table property collector that marks a SST
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// file as need-compaction when it observe at least "D" deletion
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// entries in any "N" consecutive entries, or the ratio of tombstone
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// entries >= deletion_ratio.
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//
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// @param sliding_window_size "N". Note that this number will be
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// round up to the smallest multiple of 128 that is no less
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// than the specified size.
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// @param deletion_trigger "D". Note that even when "N" is changed,
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// the specified number for "D" will not be changed.
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// @param deletion_ratio, if <= 0 or > 1, disable triggering compaction
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// based on deletion ratio. Disabled by default.
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extern std::shared_ptr<CompactOnDeletionCollectorFactory>
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NewCompactOnDeletionCollectorFactory(size_t sliding_window_size,
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size_t deletion_trigger,
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double deletion_ratio = 0);
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} // namespace ROCKSDB_NAMESPACE
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