1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// Log format information shared by reader and writer.
// See ../doc/log_format.txt for more detail.
#pragma once
#include "rocksdb/rocksdb_namespace.h"
namespace ROCKSDB_NAMESPACE {
namespace log {
enum RecordType {
// Zero is reserved for preallocated files
kZeroType = 0,
kFullType = 1,
// For fragments
kFirstType = 2,
kMiddleType = 3,
kLastType = 4,
// For recycled log files
kRecyclableFullType = 5,
kRecyclableFirstType = 6,
kRecyclableMiddleType = 7,
kRecyclableLastType = 8,
// Compression Type
kSetCompressionType = 9,
};
static const int kMaxRecordType = kSetCompressionType;
static const unsigned int kBlockSize = 32768;
// Header is checksum (4 bytes), length (2 bytes), type (1 byte)
static const int kHeaderSize = 4 + 2 + 1;
// Recyclable header is checksum (4 bytes), length (2 bytes), type (1 byte),
// log number (4 bytes).
static const int kRecyclableHeaderSize = 4 + 2 + 1 + 4;
} // namespace log
} // namespace ROCKSDB_NAMESPACE
|
