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
|
/**
* Copyright (C) 2022-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::kControl
#include "mongo/db/concurrency/exception_util.h"
#include "mongo/base/counter.h"
#include "mongo/db/commands/server_status_metric.h"
#include "mongo/db/namespace_string.h"
#include "mongo/logv2/log.h"
#include "mongo/util/duration.h"
#include "mongo/util/log_and_backoff.h"
namespace mongo {
MONGO_FAIL_POINT_DEFINE(skipWriteConflictRetries);
void logWriteConflictAndBackoff(int attempt, StringData operation, StringData ns) {
logAndBackoff(4640401,
logv2::LogComponent::kWrite,
logv2::LogSeverity::Debug(1),
static_cast<size_t>(attempt),
"Caught WriteConflictException",
"operation"_attr = operation,
logAttrs(NamespaceString(ns)));
}
namespace {
Counter64 temporarilyUnavailableErrors;
Counter64 temporarilyUnavailableErrorsEscaped;
Counter64 temporarilyUnavailableErrorsConvertedToWriteConflict;
ServerStatusMetricField<Counter64> displayTemporarilyUnavailableErrors(
"operation.temporarilyUnavailableErrors", &temporarilyUnavailableErrors);
ServerStatusMetricField<Counter64> displayTemporarilyUnavailableErrorsEscaped(
"operation.temporarilyUnavailableErrorsEscaped", &temporarilyUnavailableErrorsEscaped);
ServerStatusMetricField<Counter64> displayTemporarilyUnavailableErrorsConverted(
"operation.temporarilyUnavailableErrorsConvertedToWriteConflict",
&temporarilyUnavailableErrorsConvertedToWriteConflict);
} // namespace
void handleTemporarilyUnavailableException(OperationContext* opCtx,
int attempts,
StringData opStr,
StringData ns,
const TemporarilyUnavailableException& e) {
opCtx->recoveryUnit()->abandonSnapshot();
temporarilyUnavailableErrors.increment(1);
if (opCtx->getClient()->isFromUserConnection() &&
attempts > TemporarilyUnavailableException::maxRetryAttempts.load()) {
LOGV2_DEBUG(6083901,
1,
"Too many TemporarilyUnavailableException's, giving up",
"reason"_attr = e.reason(),
"attempts"_attr = attempts,
"operation"_attr = opStr,
logAttrs(NamespaceString(ns)));
temporarilyUnavailableErrorsEscaped.increment(1);
throw e;
}
// Back off linearly with the retry attempt number.
auto sleepFor =
Milliseconds(TemporarilyUnavailableException::retryBackoffBaseMs.load()) * attempts;
LOGV2_DEBUG(6083900,
1,
"Caught TemporarilyUnavailableException",
"reason"_attr = e.reason(),
"attempts"_attr = attempts,
"operation"_attr = opStr,
"sleepFor"_attr = sleepFor,
logAttrs(NamespaceString(ns)));
opCtx->sleepFor(sleepFor);
}
void handleTemporarilyUnavailableExceptionInTransaction(OperationContext* opCtx,
StringData opStr,
StringData ns,
const TemporarilyUnavailableException& e) {
// Since WriteConflicts are tagged as TransientTransactionErrors and TemporarilyUnavailable
// errors are not, we convert the error to a WriteConflict to allow users of multi-document
// transactions to retry without changing any behavior. Otherwise, we let the error escape as
// usual.
temporarilyUnavailableErrorsConvertedToWriteConflict.increment(1);
throw WriteConflictException(e.reason());
}
} // namespace mongo
|
