Fix perf_context.user_key_comparison_count for range scan (#5098)
Summary: Currently `perf_context.user_key_comparison_count` is bump only in `InternalKeyComparator`. For places user comparator is used directly the counter is not bump. Fixing the majority of it. Index iterator and filter code also use user comparator directly and don't bump the counter. It is not fixed in this patch. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5098 Differential Revision: D14603753 Pulled By: siying fbshipit-source-id: 1cd41035644ca9e49b97a51030a5d1e15f5f3caemain
Yi Wu
5 years ago
committed by
Facebook Github Bot
parent
2b4d5ceb47
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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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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once |
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#include "monitoring/perf_context_imp.h" |
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#include "rocksdb/comparator.h" |
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namespace rocksdb { |
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// Wrapper of user comparator, with auto increment to
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// perf_context.user_key_comparison_count.
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class UserComparatorWrapper final : public Comparator { |
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public: |
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explicit UserComparatorWrapper(const Comparator* const user_cmp) |
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: user_comparator_(user_cmp) {} |
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~UserComparatorWrapper() = default; |
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const Comparator* user_comparator() const { return user_comparator_; } |
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int Compare(const Slice& a, const Slice& b) const override { |
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PERF_COUNTER_ADD(user_key_comparison_count, 1); |
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return user_comparator_->Compare(a, b); |
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} |
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bool Equal(const Slice& a, const Slice& b) const override { |
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PERF_COUNTER_ADD(user_key_comparison_count, 1); |
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return user_comparator_->Equal(a, b); |
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} |
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const char* Name() const override { return user_comparator_->Name(); } |
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void FindShortestSeparator(std::string* start, |
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const Slice& limit) const override { |
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return user_comparator_->FindShortestSeparator(start, limit); |
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} |
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void FindShortSuccessor(std::string* key) const override { |
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return user_comparator_->FindShortSuccessor(key); |
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} |
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const Comparator* GetRootComparator() const override { |
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return user_comparator_->GetRootComparator(); |
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} |
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bool IsSameLengthImmediateSuccessor(const Slice& s, |
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const Slice& t) const override { |
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return user_comparator_->IsSameLengthImmediateSuccessor(s, t); |
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} |
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bool CanKeysWithDifferentByteContentsBeEqual() const override { |
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return user_comparator_->CanKeysWithDifferentByteContentsBeEqual(); |
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} |
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private: |
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const Comparator* user_comparator_; |
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}; |
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} // namespace rocksdb
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