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
|
/**
* 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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_snapshot_manager.h"
#include "mongo/db/server_options.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_begin_transaction_block.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_util.h"
#include "mongo/logv2/log.h"
namespace mongo {
void WiredTigerSnapshotManager::setCommittedSnapshot(const Timestamp& timestamp) {
stdx::lock_guard<Latch> lock(_committedSnapshotMutex);
invariant(!_committedSnapshot || *_committedSnapshot <= timestamp);
_committedSnapshot = timestamp;
}
void WiredTigerSnapshotManager::setLastApplied(const Timestamp& timestamp) {
stdx::lock_guard<Latch> lock(_lastAppliedMutex);
if (timestamp.isNull())
_lastApplied = boost::none;
else
_lastApplied = timestamp;
}
boost::optional<Timestamp> WiredTigerSnapshotManager::getLastApplied() {
stdx::lock_guard<Latch> lock(_lastAppliedMutex);
return _lastApplied;
}
void WiredTigerSnapshotManager::dropAllSnapshots() {
stdx::lock_guard<Latch> lock(_committedSnapshotMutex);
_committedSnapshot = boost::none;
}
boost::optional<Timestamp> WiredTigerSnapshotManager::getMinSnapshotForNextCommittedRead() const {
if (!serverGlobalParams.enableMajorityReadConcern) {
return boost::none;
}
stdx::lock_guard<Latch> lock(_committedSnapshotMutex);
return _committedSnapshot;
}
Timestamp WiredTigerSnapshotManager::beginTransactionOnCommittedSnapshot(
WT_SESSION* session,
PrepareConflictBehavior prepareConflictBehavior,
RoundUpPreparedTimestamps roundUpPreparedTimestamps) const {
WiredTigerBeginTxnBlock txnOpen(session, prepareConflictBehavior, roundUpPreparedTimestamps);
stdx::lock_guard<Latch> lock(_committedSnapshotMutex);
uassert(ErrorCodes::ReadConcernMajorityNotAvailableYet,
"Committed view disappeared while running operation",
_committedSnapshot);
auto status = txnOpen.setReadSnapshot(_committedSnapshot.get());
fassert(30635, status);
txnOpen.done();
return *_committedSnapshot;
}
} // namespace mongo
|