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
|
/**
* 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.
*/
#include "mongo/db/s/ddl_lock_manager.h"
#include "mongo/db/operation_context.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
// TODO SERVER-68551: Remove once 7.0 becomes last-lts
MONGO_FAIL_POINT_DEFINE(disableReplSetDistLockManager);
const auto ddlLockManagerDecorator = ServiceContext::declareDecoration<DDLLockManager>();
} // namespace
const Minutes DDLLockManager::kDefaultLockTimeout(5);
const Milliseconds DDLLockManager::kSingleLockAttemptTimeout(0);
DDLLockManager* DDLLockManager::get(ServiceContext* service) {
return &ddlLockManagerDecorator(service);
}
DDLLockManager* DDLLockManager::get(OperationContext* opCtx) {
return get(opCtx->getServiceContext());
}
DDLLockManager::ScopedLock DDLLockManager::lock(OperationContext* opCtx,
StringData ns,
StringData reason,
Milliseconds timeout) {
stdx::unique_lock<Latch> lock(_mutex);
auto iter = _inProgressMap.find(ns);
if (iter == _inProgressMap.end()) {
_inProgressMap.try_emplace(ns, std::make_shared<NSLock>(reason));
} else {
auto nsLock = iter->second;
nsLock->numWaiting++;
ScopeGuard guard([&] { nsLock->numWaiting--; });
if (!opCtx->waitForConditionOrInterruptFor(
nsLock->cvLocked, lock, timeout, [nsLock]() { return !nsLock->isInProgress; })) {
using namespace fmt::literals;
uasserted(
ErrorCodes::LockBusy,
"Failed to acquire DDL lock for namespace '{}' after {} that is currently locked with reason '{}'"_format(
ns, timeout.toString(), nsLock->reason));
}
guard.dismiss();
nsLock->reason = reason.toString();
nsLock->isInProgress = true;
}
LOGV2(6855301, "Acquired DDL lock", "resource"_attr = ns, "reason"_attr = reason);
return {ns, reason, this};
}
DDLLockManager::ScopedLock::ScopedLock(StringData ns,
StringData reason,
DDLLockManager* lockManager)
: _ns(ns.toString()), _reason(reason.toString()), _lockManager(lockManager) {}
DDLLockManager::ScopedLock::ScopedLock(ScopedLock&& other)
: _ns(std::move(other._ns)),
_reason(std::move(other._reason)),
_lockManager(other._lockManager) {
other._lockManager = nullptr;
}
DDLLockManager::ScopedLock::~ScopedLock() {
if (_lockManager) {
stdx::unique_lock<Latch> lock(_lockManager->_mutex);
auto iter = _lockManager->_inProgressMap.find(_ns);
iter->second->numWaiting--;
iter->second->reason.clear();
iter->second->isInProgress = false;
iter->second->cvLocked.notify_one();
if (iter->second->numWaiting == 0) {
_lockManager->_inProgressMap.erase(_ns);
}
LOGV2(6855302, "Released DDL lock", "resource"_attr = _ns, "reason"_attr = _reason);
}
}
} // namespace mongo
|
