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198459ce17
Summary:
According to 4848bd0c4e/db/log_reader.cc (L355), the original text is misleading when describing the layout of RecyclableLogHeader.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4315
Differential Revision: D9505284
Pulled By: riversand963
fbshipit-source-id: 79994c37a69e7003f03453e7efc0186feeafa609
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
// 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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//
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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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// Log format information shared by reader and writer.
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// See ../doc/log_format.txt for more detail.
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#pragma once
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namespace rocksdb {
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namespace log {
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enum RecordType {
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// Zero is reserved for preallocated files
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kZeroType = 0,
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kFullType = 1,
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// For fragments
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kFirstType = 2,
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kMiddleType = 3,
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kLastType = 4,
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// For recycled log files
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kRecyclableFullType = 5,
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kRecyclableFirstType = 6,
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kRecyclableMiddleType = 7,
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kRecyclableLastType = 8,
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};
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static const int kMaxRecordType = kRecyclableLastType;
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static const unsigned int kBlockSize = 32768;
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// Header is checksum (4 bytes), length (2 bytes), type (1 byte)
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static const int kHeaderSize = 4 + 2 + 1;
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// Recyclable header is checksum (4 bytes), length (2 bytes), type (1 byte),
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// log number (4 bytes).
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static const int kRecyclableHeaderSize = 4 + 2 + 1 + 4;
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} // namespace log
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} // namespace rocksdb
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