a14b7873ee
Summary: Introduces a new class for managing write buffer memory across column families. We supplement ColumnFamilyOptions::write_buffer_size with ColumnFamilyOptions::write_buffer, a shared pointer to a WriteBuffer instance that enforces memory limits before flushing out to disk. Test Plan: Added SharedWriteBuffer unit test to db_test.cc Reviewers: sdong, rven, ljin, igor Reviewed By: igor Subscribers: tnovak, yhchiang, dhruba, xjin, MarkCallaghan, yoshinorim Differential Revision: https://reviews.facebook.net/D22581
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// Copyright (c) 2014, 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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//
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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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//
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// This is used by the MemTable to allocate write buffer memory. It connects
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// to WriteBuffer so we can track and enforce overall write buffer limits.
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#pragma once
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#include "util/allocator.h"
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namespace rocksdb {
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class Arena;
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class Logger;
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class WriteBuffer;
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class MemTableAllocator : public Allocator {
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public:
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explicit MemTableAllocator(Arena* arena, WriteBuffer* write_buffer);
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~MemTableAllocator();
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// Allocator interface
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char* Allocate(size_t bytes) override;
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char* AllocateAligned(size_t bytes, size_t huge_page_size = 0,
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Logger* logger = nullptr) override;
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size_t BlockSize() const override;
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// Call when we're finished allocating memory so we can free it from
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// the write buffer's limit.
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void DoneAllocating();
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private:
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Arena* arena_;
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WriteBuffer* write_buffer_;
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size_t bytes_allocated_;
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// No copying allowed
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MemTableAllocator(const MemTableAllocator&);
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void operator=(const MemTableAllocator&);
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};
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} // namespace rocksdb
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