mongodb/jstests/replsets/force_sync_source_candidate.js

/*
 * Tests that the 'forceSyncSourceCandidate' failpoint correctly forces a sync source.
 *
 * @tags: [requires_replication]
 */

(function() {
"use strict";

load("jstests/replsets/rslib.js");

const failpointName = "forceSyncSourceCandidate";

const rst = new ReplSetTest({
    nodes: [{}, {rsConfig: {priority: 0}}, {rsConfig: {priority: 0}}, {rsConfig: {priority: 0}}],
    // Allow many initial sync attempts. Initial sync may fail if the sync source does not have
    // an oplog yet because it has not conducted its own initial sync yet.
    // We turn on the noop writer to encourage successful sync source selection.
    nodeOptions: {setParameter: {numInitialSyncAttempts: 100, writePeriodicNoops: true}}
});
const nodes = rst.startSet();

function getDataObj(syncSource) {
    return {hostAndPort: syncSource.host};
}

setFailPoint(nodes[1], failpointName, getDataObj(nodes[0]));
setFailPoint(nodes[2], failpointName, getDataObj(nodes[1]));
setFailPoint(nodes[3], failpointName, getDataObj(nodes[2]));

rst.initiate();
const primary = rst.getPrimary();

rst.awaitSyncSource(nodes[1], nodes[0]);
rst.awaitSyncSource(nodes[2], nodes[1]);
rst.awaitSyncSource(nodes[3], nodes[2]);

rst.stopSet();
})();