jstests/multiVersion/mixed_version_transactions_during_rollback_via_refetch.js


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

/**
 * Tests that a 4.2 binVersion node with FCV4.0 is able to perform rollback-via-refetch with an
 * unprepared transaction against a node with 4.0 binVersion.
 */

(function() {
    load("jstests/replsets/libs/rollback_test.js");

    jsTest.log("Starting a mixed version replica set.");

    TestData.replSetFeatureCompatibilityVersion = '4.0';
    const rst = new ReplSetTest({
        nodes: [
            {binVersion: 'latest'},
            {binVersion: 'latest'},
            {binVersion: 'latest', rsConfig: {priority: 0}},
        ],
        useBridge: true,
        nodeOptions: {enableMajorityReadConcern: "false"}
    });
    rst.startSet();
    const config = rst.getReplSetConfig();
    config.settings = {chainingAllowed: false};
    rst.initiate(config);
    // A 4.2 binVersion primary with empty data files will set FCV to 4.2 when elected. This will
    // cause an IncompatibleServerVersion error when connecting with a 4.0 binVersion node.
    // Therefore, we wait until the replica set is initiated with FCV4.0 before switching the
    // binVersion to 4.0.
    rst.restart(1, {binVersion: '4.0'});

    const collName = 'mixed_version_transactions_during_rollback_via_refetch';
    rst.getPrimary().getDB('test').getCollection(collName).drop({writeConcern: {w: "majority"}});
    assert.commandWorked(
        rst.getPrimary().getDB('test').createCollection(collName, {writeConcern: {w: "majority"}}));

    rst.awaitReplication();
    const rollbackTest = new RollbackTest(collName, rst);

    const primary = rollbackTest.getPrimary();

    const session = primary.startSession({causalConsistency: false});
    const sessionDB = session.getDatabase('test');
    const sessionColl = sessionDB.getCollection(collName);

    jsTestLog("Start a transaction and insert a document.");
    session.startTransaction();
    const doc1 = {_id: 1};
    assert.commandWorked(sessionColl.insert(doc1));
    assert.eq(doc1, sessionColl.findOne(doc1));

    // Stop replication from the current primary.
    rollbackTest.transitionToRollbackOperations();
    jsTestLog("Commit the transaction. This transaction is expected to be rolled back.");
    assert.commandWorked(session.commitTransaction_forTesting());

    // Step down current primary and elect a node that lacks the transaction oplog entry.
    rollbackTest.transitionToSyncSourceOperationsBeforeRollback();

    rollbackTest.transitionToSyncSourceOperationsDuringRollback();

    rollbackTest.transitionToSteadyStateOperations();

    // Assert that the document has been rolled back.
    assert.eq(null, sessionColl.findOne(doc1));

    rollbackTest.stop();

})();