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
|
/**
* 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::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/introspect.h"
#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/user_set.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/stats/resource_consumption_metrics.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::endl;
using std::string;
using std::unique_ptr;
void profile(OperationContext* opCtx, NetworkOp op) {
// Initialize with 1kb at start in order to avoid realloc later
BufBuilder profileBufBuilder(1024);
BSONObjBuilder b(profileBufBuilder);
{
Locker::LockerInfo lockerInfo;
opCtx->lockState()->getLockerInfo(&lockerInfo, CurOp::get(opCtx)->getLockStatsBase());
CurOp::get(opCtx)->debug().append(
opCtx, lockerInfo.stats, opCtx->lockState()->getFlowControlStats(), b);
}
auto& metricsCollector = ResourceConsumption::MetricsCollector::get(opCtx);
if (metricsCollector.hasCollectedMetrics()) {
BSONObjBuilder metricsBuilder = b.subobjStart("operationMetrics");
const auto& metrics = metricsCollector.getMetrics();
metrics.toBson(&metricsBuilder);
metricsBuilder.done();
}
b.appendDate("ts", jsTime());
b.append("client", opCtx->getClient()->clientAddress());
if (auto clientMetadata = ClientMetadata::get(opCtx->getClient())) {
auto appName = clientMetadata->getApplicationName();
if (!appName.empty()) {
b.append("appName", appName);
}
}
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
OpDebug::appendUserInfo(*CurOp::get(opCtx), b, authSession);
const BSONObj p = b.done();
const string dbName(nsToDatabase(CurOp::get(opCtx)->getNS()));
auto origFlowControl = opCtx->shouldParticipateInFlowControl();
// The system.profile collection is non-replicated, so writes to it do not cause
// replication lag. As such, they should be excluded from Flow Control.
opCtx->setShouldParticipateInFlowControl(false);
// Set the opCtx to be only interruptible for replication state changes. This is needed
// because for some operations that are already marked as killed due to errors such as
// operation time exceeding maxTimeMS, we still want to output the profiler entry. Thus
// in these cases we do not interrupt lock acquisition even though the opCtx has already
// been killed. In the meantime we need to make sure replication state changes can still
// interrupt lock acquisition, otherwise there could be deadlocks when the state change
// thread is waiting for the session checked out by this opCtx while holding RSTL lock.
// However when maxLockTimeout is set, we want it to be always interruptible.
if (!opCtx->lockState()->hasMaxLockTimeout()) {
opCtx->setIgnoreInterruptsExceptForReplStateChange(true);
}
// IX lock acquisitions beyond this block will not be related to writes to system.profile.
ON_BLOCK_EXIT([opCtx, origFlowControl] {
opCtx->setIgnoreInterruptsExceptForReplStateChange(false);
opCtx->setShouldParticipateInFlowControl(origFlowControl);
});
try {
const auto dbProfilingNS = NamespaceString(dbName, "system.profile");
AutoGetCollection autoColl(opCtx, dbProfilingNS, MODE_IX);
Database* const db = autoColl.getDb();
if (!db) {
// Database disappeared.
LOGV2(20700,
"note: not profiling because db went away for {namespace}",
"note: not profiling because db went away for namespace",
"namespace"_attr = CurOp::get(opCtx)->getNS());
return;
}
// We are about to enforce prepare conflicts for the OperationContext. But it is illegal
// to change the behavior of ignoring prepare conflicts while any storage transaction is
// still active. So we need to call abandonSnapshot() to close any open transactions.
// This call is also harmless because any previous reads or writes should have already
// completed, as profile() is called at the end of an operation.
opCtx->recoveryUnit()->abandonSnapshot();
// The profiler performs writes even after read commands. Ignoring prepare conflicts is
// not allowed while performing writes, so temporarily enforce prepare conflicts.
EnforcePrepareConflictsBlock enforcePrepare(opCtx);
uassertStatusOK(createProfileCollection(opCtx, db));
auto coll =
CollectionCatalog::get(opCtx)->lookupCollectionByNamespace(opCtx, dbProfilingNS);
invariant(!opCtx->shouldParticipateInFlowControl());
WriteUnitOfWork wuow(opCtx);
OpDebug* const nullOpDebug = nullptr;
uassertStatusOK(coll->insertDocument(opCtx, InsertStatement(p), nullOpDebug, false));
wuow.commit();
} catch (const AssertionException& assertionEx) {
LOGV2_WARNING(20703,
"Caught Assertion while trying to profile {operation} against "
"{namespace}: {assertion}",
"Caught Assertion while trying to profile operation",
"operation"_attr = networkOpToString(op),
"namespace"_attr = CurOp::get(opCtx)->getNS(),
"assertion"_attr = redact(assertionEx));
}
}
Status createProfileCollection(OperationContext* opCtx, Database* db) {
invariant(opCtx->lockState()->isDbLockedForMode(db->name(), MODE_IX));
invariant(!opCtx->shouldParticipateInFlowControl());
const auto dbProfilingNS = NamespaceString(db->name(), "system.profile");
// Checking the collection exists must also be done in the WCE retry loop. Only retrying
// collection creation would endlessly throw errors because the collection exists: must check
// and see the collection exists in order to break free.
return writeConflictRetry(opCtx, "createProfileCollection", dbProfilingNS.ns(), [&] {
const CollectionPtr collection =
CollectionCatalog::get(opCtx)->lookupCollectionByNamespace(opCtx, dbProfilingNS);
if (collection) {
if (!collection->isCapped()) {
return Status(ErrorCodes::NamespaceExists,
str::stream() << dbProfilingNS << " exists but isn't capped");
}
return Status::OK();
}
// system.profile namespace doesn't exist; create it
LOGV2(20701,
"Creating profile collection: {namespace}",
"Creating profile collection",
"namespace"_attr = dbProfilingNS);
CollectionOptions collectionOptions;
collectionOptions.capped = true;
collectionOptions.cappedSize = 1024 * 1024;
WriteUnitOfWork wunit(opCtx);
repl::UnreplicatedWritesBlock uwb(opCtx);
invariant(db->createCollection(opCtx, dbProfilingNS, collectionOptions));
wunit.commit();
return Status::OK();
});
}
} // namespace mongo
|
