mongo/jstests/replsets/initial_sync_update_missing_doc3.js

/**
 * Initial sync runs in several phases - the first 3 are as follows:
 * 1) fetches the last oplog entry (op_start1) on the source;
 * 2) copies all non-local databases from the source; and
 * 3) fetches and applies operations from the source after op_start1.
 *
 * This test updates and deletes a document on the source between phases 1 and 2. The
 * secondary will initially fail to apply the update operation in phase 3 and subsequently have
 * to attempt to check the source for a new copy of the document. Before the secondary checks the
 * source, we insert a new copy of the document into this collection on the source and mark the
 * collection on which the document to be fetched resides as drop pending, thus effectively
 * renaming the collection but preserving the UUID. This ensures the secondary fetches the
 * document by UUID rather than namespace.
 */

(function() {
    load("jstests/libs/check_log.js");
    load("jstests/replsets/libs/initial_sync_update_missing_doc.js");
    load("jstests/replsets/libs/two_phase_drops.js");  // For TwoPhaseDropCollectionTest.

    var name = 'initial_sync_update_missing_doc3';
    var replSet = new ReplSetTest({
        name: name,
        nodes: 1,
    });

    replSet.startSet();
    replSet.initiate();
    const primary = replSet.getPrimary();
    const dbName = 'test';

    // Check for 'system.drop' two phase drop support.
    if (!TwoPhaseDropCollectionTest.supportsDropPendingNamespaces(replSet)) {
        jsTestLog('Drop pending namespaces not supported by storage engine. Skipping test.');
        replSet.stopSet();
        return;
    }

    var coll = primary.getDB(dbName).getCollection(name);
    assert.commandWorked(coll.insert({_id: 0, x: 1}));

    // Add a secondary node with priority: 0 so that we prevent elections while it is syncing
    // from the primary.
    // We cannot give the secondary votes: 0 because then it will not be able to acknowledge
    // majority writes. That means the sync source can immediately drop it's collection
    // because it alone determines the majority commit point.
    const secondaryConfig = {rsConfig: {priority: 0}};
    const secondary = reInitiateSetWithSecondary(replSet, secondaryConfig);

    // Update and remove document on primary.
    assert.commandWorked(coll.update({_id: 0}, {x: 2}, {upsert: false}));
    assert.commandWorked(coll.remove({_id: 0}, {justOne: true}));

    turnOffHangBeforeCopyingDatabasesFailPoint(secondary);

    // Re-insert deleted document.
    assert.commandWorked(coll.insert({_id: 0, x: 3}));
    // Mark the collection as drop pending so it gets renamed, but retains the UUID.
    assert.commandWorked(primary.getDB('test').runCommand({"drop": name}));

    var res = assert.commandWorked(secondary.adminCommand({replSetGetStatus: 1}));
    assert.eq(res.initialSyncStatus.fetchedMissingDocs, 0);
    var firstOplogEnd = res.initialSyncStatus.initialSyncOplogEnd;

    secondary.getDB('test').setLogLevel(1, 'replication');
    turnOffHangBeforeGettingMissingDocFailPoint(primary, secondary, name, 1);
    secondary.getDB('test').setLogLevel(0, 'replication');

    replSet.awaitReplication();
    replSet.awaitSecondaryNodes();

    replSet.stopSet();
})();