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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <atomic>
#include <string>
#include "mongo/platform/atomic_proxy.h"
#include "mongo/platform/atomic_word.h"
/*
* This file defines the storage for options that come from the command line related to data file
* persistence. Many executables that can access data files directly such as mongod and certain
* tools use these variables, but each executable may have a different set of command line flags
* that allow the user to change a different subset of these options.
*/
namespace mongo {
struct StorageGlobalParams {
StorageGlobalParams();
void reset();
// Default data directory for mongod when running in non-config server mode.
static const char* kDefaultDbPath;
// Default data directory for mongod when running as the config database of
// a sharded cluster.
static const char* kDefaultConfigDbPath;
// --storageEngine
// storage engine for this instance of mongod.
std::string engine;
// True if --storageEngine was passed on the command line, and false otherwise.
bool engineSetByUser;
// The directory where the mongod instance stores its data.
std::string dbpath;
// --upgrade
// Upgrades the on-disk data format of the files specified by the --dbpath to the
// latest version, if needed.
bool upgrade;
// --repair
// Runs a repair routine on all databases.
bool repair;
bool dur; // --dur durability (now --journal)
// --journalCommitInterval
static constexpr int kMaxJournalCommitIntervalMs = 500;
AtomicWord<int> journalCommitIntervalMs;
// --notablescan
// no table scans allowed
AtomicWord<bool> noTableScan;
// --directoryperdb
// Stores each database’s files in its own folder in the data directory.
// When applied to an existing system, the directoryPerDB option alters
// the storage pattern of the data directory.
bool directoryperdb;
// --syncdelay
// Controls how much time can pass before MongoDB flushes data to the data files
// via an fsync operation.
// Do not set this value on production systems.
// In almost every situation, you should use the default setting.
static constexpr double kMaxSyncdelaySecs = 9.0 * 1000.0 * 1000.0;
AtomicDouble syncdelay; // seconds between fsyncs
// --queryableBackupMode
// Puts MongoD into "read-only" mode. MongoD will not write any data to the underlying
// filesystem. Note that read operations may require writes. For example, a sort on a large
// dataset may fail if it requires spilling to disk.
bool readOnly;
// --groupCollections
// Dictate to the storage engine that it should attempt to create new MongoDB collections from
// an existing underlying MongoDB database level resource if possible. This can improve
// workloads that rely heavily on creating many collections within a database.
bool groupCollections;
// --oplogMinRetentionHours
// Controls what size the oplog should be in addition to oplogSize. If set, the oplog will only
// be truncated if it is over the capped size, and if the bucket of oldest oplog entries fall
// outside of the retention window which is set by this option.
AtomicWord<double> oplogMinRetentionHours;
// Controls whether we allow the OplogStones mechanism to delete oplog history on WT.
bool allowOplogTruncation = true;
};
extern StorageGlobalParams storageGlobalParams;
} // namespace mongo
|
