95b0e89b5d
Summary: Improve write buffer manager in several ways: 1. Size is tracked when arena block is allocated, rather than every allocation, so that it can better track actual memory usage and the tracking overhead is slightly lower. 2. We start to trigger memtable flush when 7/8 of the memory cap hits, instead of 100%, and make 100% much harder to hit. 3. Allow a cache object to be passed into buffer manager and the size allocated by memtable can be costed there. This can help users have one single memory cap across block cache and memtable. Closes https://github.com/facebook/rocksdb/pull/2350 Differential Revision: D5110648 Pulled By: siying fbshipit-source-id: b4238113094bf22574001e446b5d88523ba00017
45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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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#ifndef ROCKSDB_LITE
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#include "port/port.h"
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#include "rocksdb/slice_transform.h"
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#include "rocksdb/memtablerep.h"
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namespace rocksdb {
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class HashCuckooRepFactory : public MemTableRepFactory {
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public:
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// maxinum number of hash functions used in the cuckoo hash.
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static const unsigned int kMaxHashCount = 10;
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explicit HashCuckooRepFactory(size_t write_buffer_size,
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size_t average_data_size,
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unsigned int hash_function_count)
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: write_buffer_size_(write_buffer_size),
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average_data_size_(average_data_size),
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hash_function_count_(hash_function_count) {}
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virtual ~HashCuckooRepFactory() {}
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using MemTableRepFactory::CreateMemTableRep;
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virtual MemTableRep* CreateMemTableRep(
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const MemTableRep::KeyComparator& compare, Allocator* allocator,
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const SliceTransform* transform, Logger* logger) override;
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virtual const char* Name() const override { return "HashCuckooRepFactory"; }
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private:
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size_t write_buffer_size_;
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size_t average_data_size_;
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const unsigned int hash_function_count_;
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};
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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