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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/minvalid.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/operation_context_impl.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
namespace {
const char kInitialSyncFlagFieldName[] = "doingInitialSync";
const BSONObj kInitialSyncFlag(BSON(kInitialSyncFlagFieldName << true));
NamespaceString minValidNss("local.replset.minvalid");
const char kBeginFieldName[] = "begin";
const char kOplogDeleteFromPointFieldName[] = "oplogDeleteFromPoint";
BSONObj getMinValidDocument(OperationContext* txn) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IS);
Lock::DBLock dblk(txn->lockState(), minValidNss.db(), MODE_IS);
Lock::CollectionLock lk(txn->lockState(), minValidNss.ns(), MODE_IS);
BSONObj doc;
bool found = Helpers::getSingleton(txn, minValidNss.ns().c_str(), doc);
invariant(found || doc.isEmpty());
return doc;
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "getMinValidDocument", minValidNss.ns());
MONGO_UNREACHABLE;
}
void updateMinValidDocument(OperationContext* txn, const BSONObj& updateSpec) {
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
ScopedTransaction transaction(txn, MODE_IX);
// For now this needs to be MODE_X because it sometimes creates the collection.
Lock::DBLock dblk(txn->lockState(), minValidNss.db(), MODE_X);
Helpers::putSingleton(txn, minValidNss.ns().c_str(), updateSpec);
}
MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "updateMinValidDocument", minValidNss.ns());
}
} // namespace
// Writes
void clearInitialSyncFlag(OperationContext* txn) {
auto replCoord = repl::ReplicationCoordinator::get(txn);
OpTime time = replCoord->getMyLastAppliedOpTime();
updateMinValidDocument(txn,
BSON("$unset"
<< kInitialSyncFlag << "$set"
<< BSON("ts" << time.getTimestamp() << "t" << time.getTerm()
<< kBeginFieldName << time.toBSON())));
txn->recoveryUnit()->waitUntilDurable();
replCoord->setMyLastDurableOpTime(time);
LOG(3) << "clearing initial sync flag";
}
void setInitialSyncFlag(OperationContext* txn) {
updateMinValidDocument(txn, BSON("$set" << kInitialSyncFlag));
txn->recoveryUnit()->waitUntilDurable();
LOG(3) << "setting initial sync flag";
}
bool getInitialSyncFlag() {
OperationContextImpl txn;
return getInitialSyncFlag(&txn);
}
bool getInitialSyncFlag(OperationContext* txn) {
const BSONObj doc = getMinValidDocument(txn);
const auto flag = doc[kInitialSyncFlagFieldName].trueValue();
LOG(3) << "returning initial sync flag value of " << flag;
return flag;
}
OpTime getMinValid(OperationContext* txn) {
const BSONObj doc = getMinValidDocument(txn);
const auto opTimeStatus = OpTime::parseFromOplogEntry(doc);
// If any of the keys (fields) are missing from the minvalid document, we return
// a null OpTime.
if (opTimeStatus == ErrorCodes::NoSuchKey) {
return {};
}
if (!opTimeStatus.isOK()) {
severe() << "Error parsing minvalid entry: " << doc
<< ", with status:" << opTimeStatus.getStatus();
fassertFailedNoTrace(40052);
}
OpTime minValid = opTimeStatus.getValue();
LOG(3) << "returning minvalid: " << minValid.toString() << "(" << minValid.toBSON() << ")";
return minValid;
}
void setMinValid(OperationContext* txn, const OpTime& minValid) {
LOG(3) << "setting minvalid to exactly: " << minValid.toString() << "(" << minValid.toBSON()
<< ")";
updateMinValidDocument(
txn, BSON("$set" << BSON("ts" << minValid.getTimestamp() << "t" << minValid.getTerm())));
}
void setMinValidToAtLeast(OperationContext* txn, const OpTime& minValid) {
LOG(3) << "setting minvalid to at least: " << minValid.toString() << "(" << minValid.toBSON()
<< ")";
updateMinValidDocument(
txn, BSON("$max" << BSON("ts" << minValid.getTimestamp() << "t" << minValid.getTerm())));
}
void setOplogDeleteFromPoint(OperationContext* txn, const Timestamp& timestamp) {
LOG(3) << "setting oplog delete from point to: " << timestamp.toStringPretty();
updateMinValidDocument(txn, BSON("$set" << BSON(kOplogDeleteFromPointFieldName << timestamp)));
}
Timestamp getOplogDeleteFromPoint(OperationContext* txn) {
const BSONObj doc = getMinValidDocument(txn);
Timestamp out = {};
if (auto field = doc[kOplogDeleteFromPointFieldName]) {
out = field.timestamp();
}
LOG(3) << "returning oplog delete from point: " << out;
return out;
}
void setAppliedThrough(OperationContext* txn, const OpTime& optime) {
LOG(3) << "setting appliedThrough to: " << optime.toString() << "(" << optime.toBSON() << ")";
if (optime.isNull()) {
updateMinValidDocument(txn, BSON("$unset" << BSON(kBeginFieldName << 1)));
} else {
updateMinValidDocument(txn, BSON("$set" << BSON(kBeginFieldName << optime.toBSON())));
}
}
OpTime getAppliedThrough(OperationContext* txn) {
const BSONObj doc = getMinValidDocument(txn);
const auto opTimeStatus = OpTime::parseFromOplogEntry(doc.getObjectField(kBeginFieldName));
if (!opTimeStatus.isOK()) {
// Return null OpTime on any parse failure, including if "begin" is missing.
return {};
}
OpTime appliedThrough = opTimeStatus.getValue();
LOG(3) << "returning appliedThrough: " << appliedThrough.toString() << "("
<< appliedThrough.toBSON() << ")";
return appliedThrough;
}
} // namespace repl
} // namespace mongo
|
