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
|
// Verifies which read concern levels transactions support, with and without afterClusterTime.
//
// @tags: [uses_transactions]
(function() {
"use strict";
const dbName = "test";
const collName = "supported_read_concern_levels";
function runTest(level, sessionOptions, supported) {
jsTestLog("Testing transactions with read concern level: " + level +
" and sessionOptions: " + tojson(sessionOptions));
db.getSiblingDB(dbName).runCommand({drop: collName, writeConcern: {w: "majority"}});
const session = db.getMongo().startSession(sessionOptions);
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB[collName];
// Set up the collection.
assert.writeOK(sessionColl.insert({_id: 0}, {writeConcern: {w: "majority"}}));
if (level) {
session.startTransaction({readConcern: {level: level}});
} else {
session.startTransaction();
}
const res = sessionDB.runCommand({find: collName});
if (supported) {
assert.commandWorked(res,
"expected success, read concern level: " + level +
", sessionOptions: " + tojson(sessionOptions));
assert.commandWorked(session.commitTransaction_forTesting());
} else {
assert.commandFailedWithCode(res,
ErrorCodes.InvalidOptions,
"expected failure, read concern level: " + level +
", sessionOptions: " + tojson(sessionOptions));
assert.commandFailedWithCode(session.abortTransaction_forTesting(),
ErrorCodes.NoSuchTransaction);
}
session.endSession();
}
// Starting a txn with no read concern level is allowed.
runTest(undefined, {causalConsistency: false}, true /*supported*/);
runTest(undefined, {causalConsistency: true}, true /*supported*/);
const kSupportedLevels = ["local", "majority", "snapshot"];
for (let level of kSupportedLevels) {
runTest(level, {causalConsistency: false}, true /*supported*/);
runTest(level, {causalConsistency: true}, true /*supported*/);
}
const kUnsupportedLevels = ["available", "linearizable"];
for (let level of kUnsupportedLevels) {
runTest(level, {causalConsistency: false}, false /*supported*/);
runTest(level, {causalConsistency: true}, false /*supported*/);
}
}());
|
