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68 lines
2.5 KiB
68 lines
2.5 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 "rocksdb/utilities/table_properties_collectors.h"
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namespace ROCKSDB_NAMESPACE {
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class CompactOnDeletionCollector : public TablePropertiesCollector {
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public:
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CompactOnDeletionCollector(size_t sliding_window_size,
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size_t deletion_trigger, double deletion_raatio);
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// AddUserKey() will be called when a new key/value pair is inserted into the
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// table.
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// @params key the user key that is inserted into the table.
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// @params value the value that is inserted into the table.
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// @params file_size file size up to now
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virtual Status AddUserKey(const Slice& key, const Slice& value,
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EntryType type, SequenceNumber seq,
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uint64_t file_size) override;
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// Finish() will be called when a table has already been built and is ready
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// for writing the properties block.
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// @params properties User will add their collected statistics to
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// `properties`.
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virtual Status Finish(UserCollectedProperties* /*properties*/) override;
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// Return the human-readable properties, where the key is property name and
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// the value is the human-readable form of value.
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virtual UserCollectedProperties GetReadableProperties() const override {
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return UserCollectedProperties();
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}
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// The name of the properties collector can be used for debugging purpose.
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virtual const char* Name() const override {
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return "CompactOnDeletionCollector";
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}
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// EXPERIMENTAL Return whether the output file should be further compacted
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virtual bool NeedCompact() const override { return need_compaction_; }
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static const int kNumBuckets = 128;
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private:
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void Reset();
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// A ring buffer that used to count the number of deletion entries for every
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// "bucket_size_" keys.
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size_t num_deletions_in_buckets_[kNumBuckets];
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// the number of keys in a bucket
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size_t bucket_size_;
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size_t current_bucket_;
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size_t num_keys_in_current_bucket_;
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size_t num_deletions_in_observation_window_;
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size_t deletion_trigger_;
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const double deletion_ratio_;
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const bool deletion_ratio_enabled_;
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size_t total_entries_ = 0;
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size_t deletion_entries_ = 0;
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// true if the current SST file needs to be compacted.
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bool need_compaction_;
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bool finished_;
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};
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} // namespace ROCKSDB_NAMESPACE
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