summaryrefslogtreecommitdiff
path: root/jstests/replsets/rslib.js
blob: 341727d900c82ff5a3bb4ffe3f8f7a2003042cec (plain)
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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
var syncFrom;
var wait;
var occasionally;
var reconnect;
var getLatestOp;
var getLeastRecentOp;
var waitForAllMembers;
var reconfig;
var awaitOpTime;
var startSetIfSupportsReadMajority;
var waitUntilAllNodesCaughtUp;
var waitForState;
var reInitiateWithoutThrowingOnAbortedMember;
var awaitRSClientHosts;
var getLastOpTime;
var setLogVerbosity;
var stopReplicationAndEnforceNewPrimaryToCatchUp;
var setFailPoint;
var clearFailPoint;
var isConfigCommitted;
var waitForConfigReplication;
var assertSameConfigContent;
var isMemberNewlyAdded;
var waitForNewlyAddedRemovalForNodeToBeCommitted;
var assertVoteCount;

(function() {
"use strict";
load("jstests/libs/write_concern_util.js");

var count = 0;
var w = 0;

/**
 * A wrapper around `replSetSyncFrom` to ensure that the desired sync source is ahead of the
 * syncing node so that the syncing node can choose to sync from the desired sync source.
 * It first stops replication on the syncing node so that it can do a write on the desired
 * sync source and make sure it's ahead. When replication is restarted, the desired sync
 * source will be a valid sync source for the syncing node.
 */
syncFrom = function(syncingNode, desiredSyncSource, rst) {
    jsTestLog("Forcing " + syncingNode.name + " to sync from " + desiredSyncSource.name);

    // Ensure that 'desiredSyncSource' doesn't already have the dummy write sitting around from
    // a previous syncFrom attempt.
    var dummyName = "dummyForSyncFrom";
    rst.getPrimary().getDB(dummyName).getCollection(dummyName).drop();
    assert.soonNoExcept(function() {
        return desiredSyncSource.getDB(dummyName).getCollection(dummyName).findOne() == null;
    });

    stopServerReplication(syncingNode);

    assert.commandWorked(rst.getPrimary().getDB(dummyName).getCollection(dummyName).insert({a: 1}));
    // Wait for 'desiredSyncSource' to get the dummy write we just did so we know it's
    // definitely ahead of 'syncingNode' before we call replSetSyncFrom.
    assert.soonNoExcept(function() {
        return desiredSyncSource.getDB(dummyName).getCollection(dummyName).findOne({a: 1});
    });

    assert.commandWorked(syncingNode.adminCommand({replSetSyncFrom: desiredSyncSource.name}));
    restartServerReplication(syncingNode);
    rst.awaitSyncSource(syncingNode, desiredSyncSource);
};

/**
 * Calls a function 'f' once a second until it returns true. Throws an exception once 'f' has
 * been called more than 'retries' times without returning true. If 'retries' is not given,
 * it defaults to 200. 'retries' must be an integer greater than or equal to zero.
 */
wait = function(f, msg, retries) {
    w++;
    var n = 0;
    var default_retries = 200;
    var delay_interval_ms = 1000;

    // Set default value if 'retries' was not given.
    if (retries === undefined) {
        retries = default_retries;
    }
    while (!f()) {
        if (n % 4 == 0) {
            print("Waiting " + w);
        }
        if (++n == 4) {
            print("" + f);
        }
        if (n >= retries) {
            throw new Error('Tried ' + retries + ' times, giving up on ' + msg);
        }
        sleep(delay_interval_ms);
    }
};

/**
 * Use this to do something once every 4 iterations.
 *
 * <pre>
 * for (i=0; i<1000; i++) {
 *   occasionally(function() { print("4 more iterations"); });
 * }
 * </pre>
 */
occasionally = function(f, n) {
    var interval = n || 4;
    if (count % interval == 0) {
        f();
    }
    count++;
};

/**
 * Attempt to re-establish and re-authenticate a Mongo connection if it was dropped, with
 * multiple retries.
 *
 * Returns upon successful re-connnection. If connection cannot be established after 200
 * retries, throws an exception.
 *
 * @param conn - a Mongo connection object or DB object.
 */
reconnect = function(conn) {
    var retries = 200;
    wait(function() {
        var db;
        try {
            // Make this work with either dbs or connections.
            if (typeof (conn.getDB) == "function") {
                db = conn.getDB('foo');
            } else {
                db = conn;
            }

            // Run a simple command to re-establish connection.
            db.bar.stats();

            // SERVER-4241: Shell connections don't re-authenticate on reconnect.
            if (jsTest.options().keyFile) {
                return jsTest.authenticate(db.getMongo());
            }
            return true;
        } catch (e) {
            print(e);
            return false;
        }
    }, retries);
};

getLatestOp = function(server) {
    server.getDB("admin").getMongo().setSlaveOk();
    var log = server.getDB("local")['oplog.rs'];
    var cursor = log.find({}).sort({'$natural': -1}).limit(1);
    if (cursor.hasNext()) {
        return cursor.next();
    }
    return null;
};

getLeastRecentOp = function({server, readConcern}) {
    server.getDB("admin").getMongo().setSlaveOk();
    const oplog = server.getDB("local").oplog.rs;
    const cursor = oplog.find().sort({$natural: 1}).limit(1).readConcern(readConcern);
    if (cursor.hasNext()) {
        return cursor.next();
    }
    return null;
};

waitForAllMembers = function(master, timeout) {
    var failCount = 0;

    assert.soon(function() {
        var state = null;
        try {
            state = master.getSisterDB("admin").runCommand({replSetGetStatus: 1});
            failCount = 0;
        } catch (e) {
            // Connection can get reset on replica set failover causing a socket exception
            print("Calling replSetGetStatus failed");
            print(e);
            return false;
        }
        occasionally(function() {
            printjson(state);
        }, 10);

        for (var m in state.members) {
            if (state.members[m].state != 1 &&  // PRIMARY
                state.members[m].state != 2 &&  // SECONDARY
                state.members[m].state != 7) {  // ARBITER
                return false;
            }
        }
        printjson(state);
        return true;
    }, "not all members ready", timeout || 10 * 60 * 1000);

    print("All members are now in state PRIMARY, SECONDARY, or ARBITER");
};

/**
 * Run a 'replSetReconfig' command with one retry.
 */
function reconfigWithRetry(primary, config, force) {
    var admin = primary.getDB("admin");
    force = force || false;
    var reconfigCommand = {
        replSetReconfig: config,
        force: force,
        maxTimeMS: ReplSetTest.kDefaultTimeoutMS
    };
    var res = admin.runCommand(reconfigCommand);

    // Retry reconfig if quorum check failed because not enough voting nodes responded.
    if (!res.ok && res.code === ErrorCodes.NodeNotFound) {
        print("Replset reconfig failed because quorum check failed. Retry reconfig once. " +
              "Error: " + tojson(res));
        res = admin.runCommand(reconfigCommand);
    }
    assert.commandWorked(res);
}

/**
 * Executes an arbitrary reconfig as a sequence of non 'force' reconfigs.
 *
 * If this function fails for any reason, the replica set config may be left in an intermediate
 * state i.e. neither in the original or target config.
 *
 * @param rst - a ReplSetTest instance.
 * @param targetConfig - the final, desired replica set config. After this function returns, the
 * given replica set should be in 'targetConfig', except with a higher version.
 */
function autoReconfig(rst, targetConfig) {
    //
    // The goal of this function is to transform the source config (the current config on the
    // primary) into the 'targetConfig' via a sequence of non 'force' reconfigurations. Non force
    // reconfigs are only permitted to add or remove a single voting node, so we need to represent
    // some given, arbitrary reconfig as a sequence of single node add/remove operations. We execute
    // the overall transformation in the following steps:
    //
    // (1) Remove members present in the source but not in the target.
    // (2) Update members present in both the source and target whose vote is removed.
    // (3) Update members present in both the source and target whose vote is added or unmodified.
    // (4) Add members present in the target but not in the source.
    //
    // After executing the above steps the config member set should be equal to the target config
    // member set. We then execute one last reconfig that attempts to install the given
    // targetConfig directly. This serves to update any top level properties of the config and it
    // also ensures that the order of the final config member list matches the order in the given
    // target config.
    //
    // Note that the order of the steps above is important to avoid passing through invalid configs
    // during the config transformation sequence. There are certain constraints imposed on replica
    // set configs e.g. there must be at least 1 electable node and less than a certain number of
    // maximum voting nodes. We know that the source and target configs are valid with respect to
    // these constraints, but we must ensure that any sequence of reconfigs executed by this
    // function never moves us to an intermediate config that violates one of these constraints.
    // Since the primary, an electable node, can never be removed from the config, it is safe to do
    // the removal of all voting nodes first, since we will be guaranteed to never go below the
    // minimum number of electable nodes. Doing removals first similarly ensures that when adding
    // nodes, we will never exceed an upper bound constraint, since we have already removed all
    // necessary voting nodes.
    //
    // Note also that this procedure may not perform the desired config transformation in the
    // minimal number of steps. For example, if the overall transformation removes 2 non-voting
    // nodes from a config we could do this with a single reconfig, but the procedure implemented
    // here will do it as a sequence of 2 reconfigs. We are not so worried about making this
    // procedure optimal since each reconfig should be relatively quick and most reconfigs shouldn't
    // take more than a few steps.
    //

    let primary = rst.getPrimary();
    const sourceConfig = rst.getReplSetConfigFromNode();
    let config = Object.assign({}, sourceConfig);

    // Look up the index of a given member in the given array by its member id.
    const memberIndex = (cfg, id) => cfg.members.findIndex(m => m._id === id);
    const memberInConfig = (cfg, id) => cfg.members.find(m => m._id === id);
    const getMember = (cfg, id) => cfg.members[memberIndex(cfg, id)];
    const getVotes = (cfg, id) =>
        getMember(cfg, id).hasOwnProperty("votes") ? getMember(cfg, id).votes : 1;

    print(`autoReconfig: source config: ${tojson(sourceConfig)}, target config: ${
        tojson(targetConfig)}`);

    // All the members in the target that aren't in the source.
    let membersToAdd = targetConfig.members.filter(m => !memberInConfig(sourceConfig, m._id));
    // All the members in the source that aren't in the target.
    let membersToRemove = sourceConfig.members.filter(m => !memberInConfig(targetConfig, m._id));
    // All the members that appear in both the source and target and have changed.
    let membersToUpdate = targetConfig.members.filter(
        (m) => memberInConfig(sourceConfig, m._id) &&
            bsonWoCompare(m, memberInConfig(sourceConfig, m._id)) !== 0);

    // Sort the members to ensure that we do updates that remove a node's vote first.
    let membersToUpdateRemoveVote = membersToUpdate.filter(
        (m) => (getVotes(targetConfig, m._id) < getVotes(sourceConfig, m._id)));
    let membersToUpdateAddVote = membersToUpdate.filter(
        (m) => (getVotes(targetConfig, m._id) >= getVotes(sourceConfig, m._id)));
    membersToUpdate = membersToUpdateRemoveVote.concat(membersToUpdateAddVote);

    print(`autoReconfig: Starting with membersToRemove: ${
        tojsononeline(membersToRemove)}, membersToUpdate: ${
        tojsononeline(membersToUpdate)}, membersToAdd: ${tojsononeline(membersToAdd)}`);

    // Remove members.
    membersToRemove.forEach(toRemove => {
        config.members = config.members.filter(m => m._id !== toRemove._id);
        config.version++;
        print(`autoReconfig: remove member id ${toRemove._id}, reconfiguring to member set: ${
            tojsononeline(config.members)}`);
        reconfigWithRetry(primary, config);
    });

    // Update members.
    membersToUpdate.forEach(toUpdate => {
        let configIndex = memberIndex(config, toUpdate._id);
        config.members[configIndex] = toUpdate;
        config.version++;
        print(`autoReconfig: update member id ${toUpdate._id}, reconfiguring to member set: ${
            tojsononeline(config.members)}`);
        reconfigWithRetry(primary, config);
    });

    // Add members.
    membersToAdd.forEach(toAdd => {
        config.members.push(toAdd);
        config.version++;
        print(`autoReconfig: add member id ${toAdd._id}, reconfiguring to member set: ${
            tojsononeline(config.members)}`);
        reconfigWithRetry(primary, config);
    });

    // Verify that the final set of members is correct.
    assert.sameMembers(targetConfig.members.map(m => m._id),
                       rst.getReplSetConfigFromNode().members.map(m => m._id),
                       "final config does not have the expected member set.");

    // Do a final reconfig to update any other top level config fields. This also ensures the
    // correct member order in the final config since the add/remove procedure above will result in
    // a members array that has the correct set of members but the members may not be in the same
    // order as the specified target config.
    print("autoReconfig: doing final reconfig to reach target config.");
    targetConfig.version = rst.getReplSetConfigFromNode().version + 1;
    reconfigWithRetry(primary, targetConfig);
}

/**
 * Executes a replica set reconfiguration on the given ReplSetTest instance.
 *
 * If this function fails for any reason while doing a non force reconfig, the replica set config
 * may be left in an intermediate state i.e. neither in the original or target config.
 *
 * @param rst - a ReplSetTest instance.
 * @param config - the desired target config. After this function returns, the
 * given replica set should be in 'config', except with a higher version.
 * @param force - should this be a 'force' reconfig or not.
 * @param doNotWaitForMembers - if set, we will skip waiting for all members to be in primary,
 *     secondary, or arbiter states
 */
reconfig = function(rst, config, force, doNotWaitForMembers) {
    "use strict";
    var primary = rst.getPrimary();
    config = rst._updateConfigIfNotDurable(config);

    // If this is a non 'force' reconfig, execute the reconfig as a series of reconfigs. Safe
    // reconfigs only allow addition/removal of a single voting node at a time, so arbitrary
    // reconfigs must be carried out in multiple steps. Using safe reconfigs guarantees that we
    // don't violate correctness properties of the replication protocol.
    if (!force) {
        autoReconfig(rst, config);
    } else {
        // Force reconfigs can always be executed in one step.
        reconfigWithRetry(primary, config, force);
    }

    var primaryAdminDB = rst.getPrimary().getDB("admin");
    if (!doNotWaitForMembers) {
        waitForAllMembers(primaryAdminDB);
    }
    return primaryAdminDB;
};

awaitOpTime = function(catchingUpNode, latestOpTimeNode) {
    var ts, ex, opTime;
    assert.soon(
        function() {
            try {
                // The following statement extracts the timestamp field from the most recent
                // element of
                // the oplog, and stores it in "ts".
                ts = getLatestOp(catchingUpNode).ts;
                opTime = getLatestOp(latestOpTimeNode).ts;
                if ((ts.t == opTime.t) && (ts.i == opTime.i)) {
                    return true;
                }
                ex = null;
                return false;
            } catch (ex) {
                return false;
            }
        },
        function() {
            var message = "Node " + catchingUpNode + " only reached optime " + tojson(ts) +
                " not " + tojson(opTime);
            if (ex) {
                message += "; last attempt failed with exception " + tojson(ex);
            }
            return message;
        });
};

/**
 * Uses the results of running replSetGetStatus against an arbitrary replset node to wait until
 * all nodes in the set are replicated through the same optime.
 * 'rs' is an array of connections to replica set nodes.  This function is useful when you
 * don't have a ReplSetTest object to use, otherwise ReplSetTest.awaitReplication is preferred.
 */
waitUntilAllNodesCaughtUp = function(rs, timeout) {
    var rsStatus;
    var firstConflictingIndex;
    var ot;
    var otherOt;
    assert.soon(
        function() {
            rsStatus = rs[0].adminCommand('replSetGetStatus');
            if (rsStatus.ok != 1) {
                return false;
            }
            assert.eq(rs.length, rsStatus.members.length, tojson(rsStatus));
            ot = rsStatus.members[0].optime;
            for (var i = 1; i < rsStatus.members.length; ++i) {
                var otherNode = rsStatus.members[i];

                // Must be in PRIMARY or SECONDARY state.
                if (otherNode.state != ReplSetTest.State.PRIMARY &&
                    otherNode.state != ReplSetTest.State.SECONDARY) {
                    return false;
                }

                // Fail if optimes are not equal.
                otherOt = otherNode.optime;
                if (!friendlyEqual(otherOt, ot)) {
                    firstConflictingIndex = i;
                    return false;
                }
            }
            return true;
        },
        function() {
            return "Optimes of members 0 (" + tojson(ot) + ") and " + firstConflictingIndex + " (" +
                tojson(otherOt) + ") are different in " + tojson(rsStatus);
        },
        timeout);
};

/**
 * Waits for the given node to reach the given state, ignoring network errors.  Ensures that the
 * connection is re-connected and usable when the function returns.
 */
waitForState = function(node, state) {
    assert.soonNoExcept(function() {
        assert.commandWorked(node.adminCommand(
            {replSetTest: 1, waitForMemberState: state, timeoutMillis: 60 * 1000 * 5}));
        return true;
    });
    // Some state transitions cause connections to be closed, but whether the connection close
    // happens before or after the replSetTest command above returns is racy, so to ensure that
    // the connection to 'node' is usable after this function returns, reconnect it first.
    reconnect(node);
};

/**
 * Starts each node in the given replica set if the storage engine supports readConcern
 *'majority'.
 * Returns true if the replica set was started successfully and false otherwise.
 *
 * @param replSetTest - The instance of {@link ReplSetTest} to start
 * @param options - The options passed to {@link ReplSetTest.startSet}
 */
startSetIfSupportsReadMajority = function(replSetTest, options) {
    replSetTest.startSet(options);
    return replSetTest.nodes[0].adminCommand("serverStatus").storageEngine.supportsCommittedReads;
};

/**
 * Performs a reInitiate() call on 'replSetTest', ignoring errors that are related to an aborted
 * secondary member. All other errors are rethrown.
 */
reInitiateWithoutThrowingOnAbortedMember = function(replSetTest) {
    try {
        replSetTest.reInitiate();
    } catch (e) {
        // reInitiate can throw because it tries to run an ismaster command on
        // all secondaries, including the new one that may have already aborted
        const errMsg = tojson(e);
        if (isNetworkError(e)) {
            // Ignore these exceptions, which are indicative of an aborted node
        } else {
            throw e;
        }
    }
};

/**
 * Waits for the specified hosts to enter a certain state.
 */
awaitRSClientHosts = function(conn, host, hostOk, rs, timeout) {
    var hostCount = host.length;
    if (hostCount) {
        for (var i = 0; i < hostCount; i++) {
            awaitRSClientHosts(conn, host[i], hostOk, rs);
        }

        return;
    }

    timeout = timeout || 5 * 60 * 1000;

    if (hostOk == undefined)
        hostOk = {ok: true};
    if (host.host)
        host = host.host;
    if (rs)
        rs = rs.name;

    print("Awaiting " + host + " to be " + tojson(hostOk) + " for " + conn + " (rs: " + rs + ")");

    var tests = 0;

    assert.soon(function() {
        var rsClientHosts = conn.adminCommand('connPoolStats').replicaSets;
        if (tests++ % 10 == 0) {
            printjson(rsClientHosts);
        }

        for (var rsName in rsClientHosts) {
            if (rs && rs != rsName)
                continue;

            for (var i = 0; i < rsClientHosts[rsName].hosts.length; i++) {
                var clientHost = rsClientHosts[rsName].hosts[i];
                if (clientHost.addr != host)
                    continue;

                // Check that *all* host properties are set correctly
                var propOk = true;
                for (var prop in hostOk) {
                    // Use special comparator for tags because isMaster can return the fields in
                    // different order. The fields of the tags should be treated like a set of
                    // strings and 2 tags should be considered the same if the set is equal.
                    if (prop == 'tags') {
                        if (!clientHost.tags) {
                            propOk = false;
                            break;
                        }

                        for (var hostTag in hostOk.tags) {
                            if (clientHost.tags[hostTag] != hostOk.tags[hostTag]) {
                                propOk = false;
                                break;
                            }
                        }

                        for (var clientTag in clientHost.tags) {
                            if (clientHost.tags[clientTag] != hostOk.tags[clientTag]) {
                                propOk = false;
                                break;
                            }
                        }

                        continue;
                    }

                    if (isObject(hostOk[prop])) {
                        if (!friendlyEqual(hostOk[prop], clientHost[prop])) {
                            propOk = false;
                            break;
                        }
                    } else if (clientHost[prop] != hostOk[prop]) {
                        propOk = false;
                        break;
                    }
                }

                if (propOk) {
                    return true;
                }
            }
        }

        return false;
    }, 'timed out waiting for replica set client to recognize hosts', timeout);
};

/**
 * Returns the last opTime of the connection based from replSetGetStatus. Can only
 * be used on replica set nodes.
 */
getLastOpTime = function(conn) {
    var replSetStatus = assert.commandWorked(conn.getDB("admin").runCommand({replSetGetStatus: 1}));
    var connStatus = replSetStatus.members.filter(m => m.self)[0];
    return connStatus.optime;
};

/**
 * Set log verbosity on all given nodes.
 * e.g. setLogVerbosity(replTest.nodes, { "replication": {"verbosity": 3} });
 */
setLogVerbosity = function(nodes, logVerbosity) {
    var verbosity = {
        "setParameter": 1,
        "logComponentVerbosity": logVerbosity,
    };
    nodes.forEach(function(node) {
        assert.commandWorked(node.adminCommand(verbosity));
    });
};

/**
 * Stop replication on secondaries, do writes and step up the node that was passed in.
 *
 * The old primary has extra writes that are not replicated to the other nodes yet,
 * but the new primary steps up, getting the vote from the the third node "voter".
 */
stopReplicationAndEnforceNewPrimaryToCatchUp = function(rst, node) {
    // Write documents that cannot be replicated to secondaries in time.
    const oldSecondaries = rst.getSecondaries();
    const oldPrimary = rst.getPrimary();

    stopServerReplication(oldSecondaries);
    for (let i = 0; i < 3; i++) {
        assert.commandWorked(oldPrimary.getDB("test").foo.insert({x: i}));
    }

    const latestOpOnOldPrimary = getLatestOp(oldPrimary);

    // New primary wins immediately, but needs to catch up.
    const newPrimary = rst.stepUpNoAwaitReplication(node);
    const latestOpOnNewPrimary = getLatestOp(newPrimary);
    // Check this node is not writable.
    assert.eq(newPrimary.getDB("test").isMaster().ismaster, false);

    return {
        oldSecondaries: oldSecondaries,
        oldPrimary: oldPrimary,
        newPrimary: newPrimary,
        voter: oldSecondaries[1],
        latestOpOnOldPrimary: latestOpOnOldPrimary,
        latestOpOnNewPrimary: latestOpOnNewPrimary
    };
};

/**
 * Sets the specified failpoint to 'alwaysOn' on the node and returns the number of
 * times the fail point has been entered so far.
 */
setFailPoint = function(node, failpoint, data = {}) {
    jsTestLog("Setting fail point " + failpoint);
    let configureFailPointRes =
        node.adminCommand({configureFailPoint: failpoint, mode: "alwaysOn", data: data});
    assert.commandWorked(configureFailPointRes);
    return configureFailPointRes.count;
};

/**
 * Sets the specified failpoint to 'off' on the node.
 */
clearFailPoint = function(node, failpoint) {
    jsTestLog("Clearing fail point " + failpoint);
    assert.commandWorked(node.adminCommand({configureFailPoint: failpoint, mode: "off"}));
};

/**
 * Returns the replSetGetConfig field 'commitmentStatus', which is true or false.
 */
isConfigCommitted = function(node) {
    let adminDB = node.getDB('admin');
    return assert.commandWorked(adminDB.runCommand({replSetGetConfig: 1, commitmentStatus: true}))
        .commitmentStatus;
};

/**
 * Wait until the config on the primary becomes committed.
 */
waitForConfigReplication = function(primary, nodes) {
    const nodeHosts = nodes == null ? "all nodes" : tojson(nodes.map((n) => n.host));
    jsTestLog("Waiting for the config on " + primary.host + " to replicate to " + nodeHosts);
    assert.soon(function() {
        const res = primary.adminCommand({replSetGetStatus: 1});
        const primaryMember = res.members.find((m) => m.self);
        function hasSameConfig(member) {
            return member.configVersion === primaryMember.configVersion &&
                member.configTerm === primaryMember.configTerm;
        }
        let members = res.members;
        if (nodes != null) {
            members = res.members.filter((m) => nodes.some((node) => m.name === node.host));
        }
        return members.every((m) => hasSameConfig(m));
    });
};

/**
 * Asserts that replica set config A is the same as replica set config B ignoring the 'version' and
 * 'term' field.
 */
assertSameConfigContent = function(configA, configB) {
    // Save original versions and terms.
    const [versionA, termA] = [configA.version, configA.term];
    const [versionB, termB] = [configB.version, configB.term];

    configA.version = configA.term = 0;
    configB.version = configB.term = 0;
    assert.eq(configA, configB);

    // Reset values so we don't modify the original objects.
    configA.version = versionA;
    configA.term = termA;
    configB.version = versionB;
    configB.term = termB;
};

isMemberNewlyAdded = function(node, memberIndex, force = false) {
    // The in-memory config will not include the 'newlyAdded' field, so we must consult the on-disk
    // version. However, the in-memory config is updated after the config is persisted to disk, so
    // we must confirm that the in-memory config agrees with the on-disk config, before returning
    // true or false.
    const configInMemory = assert.commandWorked(node.adminCommand({replSetGetConfig: 1})).config;

    const versionSetInMemory = configInMemory.hasOwnProperty("version");
    const termSetInMemory = configInMemory.hasOwnProperty("term");

    // Since the term is not set in a force reconfig, we skip the check for the term if
    // 'force=true'.
    if (!versionSetInMemory || (!termSetInMemory && !force)) {
        throw new Error("isMemberNewlyAdded: in-memory config has no version or term: " +
                        tojsononeline(configInMemory));
    }

    const configOnDisk = node.getDB("local").system.replset.findOne();
    const termSetOnDisk = configOnDisk.hasOwnProperty("term");

    const isVersionSetCorrectly = (configOnDisk.version === configInMemory.version);
    const isTermSetCorrectly =
        ((!termSetInMemory && !termSetOnDisk) || (configOnDisk.term === configInMemory.term));

    if (!isVersionSetCorrectly || !isTermSetCorrectly) {
        throw new error(
            "isMemberNewlyAdded: in-memory config version/term does not match on-disk config." +
            " in-memory: " + tojsononeline(configInMemory) +
            ", on-disk: " + tojsononeline(configOnDisk));
    }

    const memberConfigOnDisk = configOnDisk.members[memberIndex];
    if (memberConfigOnDisk.hasOwnProperty("newlyAdded")) {
        assert(memberConfigOnDisk["newlyAdded"] === true, () => tojson(configOnDisk));
        return true;
    }
    return false;
};

waitForNewlyAddedRemovalForNodeToBeCommitted = function(node, memberIndex, force = false) {
    jsTestLog("Waiting for member " + memberIndex + " to no longer be 'newlyAdded'");
    assert.soonNoExcept(function() {
        return !isMemberNewlyAdded(node, memberIndex, force) && isConfigCommitted(node);
    }, () => tojson(node.getDB("local").system.replset.findOne()));
};

assertVoteCount = function(node, {
    votingMembersCount,
    majorityVoteCount,
    writableVotingMembersCount,
    writeMajorityCount,
    totalMembersCount
}) {
    const status = assert.commandWorked(node.adminCommand({replSetGetStatus: 1}));
    assert.eq(status["votingMembersCount"], votingMembersCount, status);
    assert.eq(status["majorityVoteCount"], majorityVoteCount, status);
    assert.eq(status["writableVotingMembersCount"], writableVotingMembersCount, status);
    assert.eq(status["writeMajorityCount"], writeMajorityCount, status);
    assert.eq(status["members"].length, totalMembersCount, status);
};
}());