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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/**
* Copyright (C) 2019-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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include <string>
#include "mongo/db/catalog/catalog_test_fixture.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/lock_state.h"
#include "mongo/db/db_raii.h"
#include "mongo/logv2/log.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/log.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace {
class DBRAIITestFixture : public CatalogTestFixture {
public:
DBRAIITestFixture() : CatalogTestFixture("wiredTiger") {}
typedef std::pair<ServiceContext::UniqueClient, ServiceContext::UniqueOperationContext>
ClientAndCtx;
ClientAndCtx makeClientWithLocker(const std::string& clientName) {
auto client = getServiceContext()->makeClient(clientName);
auto opCtx = client->makeOperationContext();
client->swapLockState(std::make_unique<LockerImpl>());
return std::make_pair(std::move(client), std::move(opCtx));
}
const NamespaceString nss = NamespaceString("test", "coll");
const Milliseconds timeoutMs = Seconds(1);
const ClientAndCtx client1 = makeClientWithLocker("client1");
const ClientAndCtx client2 = makeClientWithLocker("client2");
};
void failsWithLockTimeout(std::function<void()> func, Milliseconds timeoutMillis) {
Date_t t1 = Date_t::now();
try {
func();
FAIL("Should have gotten an exception due to timeout");
} catch (const ExceptionFor<ErrorCodes::LockTimeout>& ex) {
LOGV2(20578, "{ex}", "ex"_attr = ex);
Date_t t2 = Date_t::now();
ASSERT_GTE(t2 - t1, timeoutMillis);
}
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadCollLockDeadline) {
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
Lock::CollectionLock collLock1(client1.second.get(), nss, MODE_X);
ASSERT(client1.second->lockState()->isCollectionLockedForMode(nss, MODE_X));
failsWithLockTimeout(
[&] {
AutoGetCollectionForRead acfr(client2.second.get(),
nss,
AutoGetCollection::ViewMode::kViewsForbidden,
Date_t::now() + timeoutMs);
},
timeoutMs);
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDBLockDeadline) {
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_X);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_X));
failsWithLockTimeout(
[&] {
AutoGetCollectionForRead coll(client2.second.get(),
nss,
AutoGetCollection::ViewMode::kViewsForbidden,
Date_t::now() + timeoutMs);
},
timeoutMs);
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadGlobalLockDeadline) {
Lock::GlobalLock gLock1(client1.second.get(), MODE_X);
ASSERT(client1.second->lockState()->isLocked());
failsWithLockTimeout(
[&] {
AutoGetCollectionForRead coll(client2.second.get(),
nss,
AutoGetCollection::ViewMode::kViewsForbidden,
Date_t::now() + timeoutMs);
},
timeoutMs);
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDeadlineNow) {
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
Lock::CollectionLock collLock1(client1.second.get(), nss, MODE_X);
ASSERT(client1.second->lockState()->isCollectionLockedForMode(nss, MODE_X));
failsWithLockTimeout(
[&] {
AutoGetCollectionForRead coll(client2.second.get(),
nss,
AutoGetCollection::ViewMode::kViewsForbidden,
Date_t::now());
},
Milliseconds(0));
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDeadlineMin) {
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
Lock::CollectionLock collLock1(client1.second.get(), nss, MODE_X);
ASSERT(client1.second->lockState()->isCollectionLockedForMode(nss, MODE_X));
failsWithLockTimeout(
[&] {
AutoGetCollectionForRead coll(
client2.second.get(), nss, AutoGetCollection::ViewMode::kViewsForbidden, Date_t());
},
Milliseconds(0));
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDBLockCompatibleXNoCollection) {
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
AutoGetCollectionForRead coll(client2.second.get(), nss);
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDBLockCompatibleXCollectionExists) {
CollectionOptions defaultCollectionOptions;
ASSERT_OK(
storageInterface()->createCollection(client1.second.get(), nss, defaultCollectionOptions));
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
AutoGetCollectionForRead coll(client2.second.get(), nss);
}
TEST_F(DBRAIITestFixture, AutoGetCollectionForReadDBLockCompatibleXCollectionExistsReadSource) {
CollectionOptions defaultCollectionOptions;
ASSERT_OK(
storageInterface()->createCollection(client1.second.get(), nss, defaultCollectionOptions));
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
auto opCtx = client2.second.get();
opCtx->recoveryUnit()->setTimestampReadSource(RecoveryUnit::ReadSource::kProvided,
Timestamp(1, 2));
ASSERT_THROWS_CODE(
AutoGetCollectionForRead(opCtx, nss), AssertionException, ErrorCodes::SnapshotUnavailable);
}
TEST_F(DBRAIITestFixture,
AutoGetCollectionForReadDBLockCompatibleXCollectionExistsSecondaryNoLastApplied) {
CollectionOptions defaultCollectionOptions;
ASSERT_OK(
storageInterface()->createCollection(client1.second.get(), nss, defaultCollectionOptions));
ASSERT_OK(repl::ReplicationCoordinator::get(client1.second.get())
->setFollowerMode(repl::MemberState::RS_SECONDARY));
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
AutoGetCollectionForRead coll(client2.second.get(), nss);
}
TEST_F(DBRAIITestFixture,
AutoGetCollectionForReadDBLockCompatibleXCollectionExistsSecondaryLastApplied) {
auto replCoord = repl::ReplicationCoordinator::get(client1.second.get());
CollectionOptions defaultCollectionOptions;
ASSERT_OK(
storageInterface()->createCollection(client1.second.get(), nss, defaultCollectionOptions));
ASSERT_OK(replCoord->setFollowerMode(repl::MemberState::RS_SECONDARY));
repl::OpTime opTime(Timestamp(200, 1), 1);
replCoord->setMyLastAppliedOpTimeAndWallTime({opTime, Date_t() + Seconds(1)});
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
AutoGetCollectionForRead coll(client2.second.get(), nss);
}
TEST_F(DBRAIITestFixture,
AutoGetCollectionForReadDBLockCompatibleXCollectionExistsSecondaryLastAppliedNested) {
// This test simulates a nested lock situation where the code would normally attempt to acquire
// the PBWM, but is stymied.
auto replCoord = repl::ReplicationCoordinator::get(client1.second.get());
CollectionOptions defaultCollectionOptions;
ASSERT_OK(
storageInterface()->createCollection(client1.second.get(), nss, defaultCollectionOptions));
ASSERT_OK(replCoord->setFollowerMode(repl::MemberState::RS_SECONDARY));
// Note that when the collection was created, above, the system chooses a minimum snapshot time
// for the collection. If we now manually set our last applied time to something very early, we
// will be guaranteed to hit the logic that triggers when the minimum snapshot time is greater
// than the read-at time, since we default to reading at last-applied when in SECONDARY state.
repl::OpTime opTime(Timestamp(2, 1), 1);
replCoord->setMyLastAppliedOpTimeAndWallTime({opTime, Date_t() + Seconds(1)});
Lock::DBLock dbLock1(client1.second.get(), nss.db(), MODE_IX);
ASSERT(client1.second->lockState()->isDbLockedForMode(nss.db(), MODE_IX));
AutoGetCollectionForRead coll(client2.second.get(), NamespaceString("local.system.js"));
// The current code uasserts in this situation, so we confirm that happens here.
ASSERT_THROWS_CODE(AutoGetCollectionForRead(client2.second.get(), nss),
DBException,
ErrorCodes::SnapshotUnavailable);
}
} // namespace
} // namespace mongo
|
