mongodb/jstests/replsets/apply_ops_wc.js

/**
 * apply_ops_wc.js
 *
 * This file tests SERVER-22270 that applyOps commands should take a writeConcern.
 * This first tests that invalid write concerns cause writeConcern errors.
 * Next, it tests replication with writeConcerns of w:2 and w:majority.
 * When there are 3 nodes up in a replica set, applyOps commands succeed.
 * It then stops replication at one seconday and confirms that applyOps commands still succeed.
 * It finally stops replication at another secondary and confirms that applyOps commands fail.
 */

(function() {
"use strict";
var nodeCount = 3;
var replTest = new ReplSetTest({name: 'applyOpsWCSet', nodes: nodeCount});
replTest.startSet();
var cfg = replTest.getReplSetConfig();
cfg.settings = {};
cfg.settings.chainingAllowed = false;
replTest.initiate(cfg);

var testDB = "applyOps-wc-test";

// Get test collection.
var master = replTest.getPrimary();
var db = master.getDB(testDB);
var coll = db.apply_ops_wc;

function dropTestCollection() {
    coll.drop();
    assert.eq(0, coll.find().itcount(), "test collection not empty");
}

dropTestCollection();

// Set up the applyOps command.
var applyOpsReq = {
    applyOps: [
        {op: "i", ns: coll.getFullName(), o: {_id: 2, x: "b"}},
        {op: "i", ns: coll.getFullName(), o: {_id: 3, x: "c"}},
        {op: "i", ns: coll.getFullName(), o: {_id: 4, x: "d"}},
    ]
};

function assertApplyOpsCommandWorked(res) {
    assert.eq(3, res.applied);
    assert.commandWorkedIgnoringWriteConcernErrors(res);
    assert.eq([true, true, true], res.results);
}

function assertWriteConcernError(res) {
    assert(res.writeConcernError);
    assert(res.writeConcernError.code);
    assert(res.writeConcernError.errmsg);
}

var invalidWriteConcerns = [{w: 'invalid'}, {w: nodeCount + 1}];

function testInvalidWriteConcern(wc) {
    jsTest.log("Testing invalid write concern " + tojson(wc));

    applyOpsReq.writeConcern = wc;
    dropTestCollection();
    assert.commandWorked(coll.insert({_id: 1, x: "a"}));
    var res = coll.runCommand(applyOpsReq);
    assertApplyOpsCommandWorked(res);
    assertWriteConcernError(res);
}

// Verify that invalid write concerns yield an error.
coll.insert({_id: 1, x: "a"});
invalidWriteConcerns.forEach(testInvalidWriteConcern);

var secondaries = replTest.getSecondaries();

var majorityWriteConcerns = [
    {w: 2, wtimeout: 30000},
    {w: 'majority', wtimeout: 30000},
];

function testMajorityWriteConcerns(wc) {
    jsTest.log("Testing " + tojson(wc));

    // Reset secondaries to ensure they can replicate.
    secondaries[0].getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'});
    secondaries[1].getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'});

    // Set the writeConcern of the applyOps command.
    applyOpsReq.writeConcern = wc;

    dropTestCollection();

    // applyOps with a full replica set should succeed.
    assert.commandWorked(coll.insert({_id: 1, x: "a"}));
    var res = db.runCommand(applyOpsReq);

    assertApplyOpsCommandWorked(res);
    assert(!res.writeConcernError,
           'applyOps on a full replicaset had writeConcern error ' + tojson(res.writeConcernError));

    dropTestCollection();

    // Stop replication at one secondary.
    secondaries[0].getDB('admin').runCommand(
        {configureFailPoint: 'rsSyncApplyStop', mode: 'alwaysOn'});

    // applyOps should succeed with only 1 node not replicating.
    assert.commandWorked(coll.insert({_id: 1, x: "a"}));
    res = db.runCommand(applyOpsReq);

    assertApplyOpsCommandWorked(res);
    assert(!res.writeConcernError,
           'applyOps on a replicaset with 2 working nodes had writeConcern error ' +
               tojson(res.writeConcernError));

    dropTestCollection();

    // Stop replication at a second secondary.
    secondaries[1].getDB('admin').runCommand(
        {configureFailPoint: 'rsSyncApplyStop', mode: 'alwaysOn'});

    // applyOps should fail after two nodes have stopped replicating.
    assert.commandWorked(coll.insert({_id: 1, x: "a"}));
    applyOpsReq.writeConcern.wtimeout = 5000;
    res = db.runCommand(applyOpsReq);

    assertApplyOpsCommandWorked(res);
    assertWriteConcernError(res);
}

majorityWriteConcerns.forEach(testMajorityWriteConcerns);

// Allow clean shutdown
secondaries[0].getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'});
secondaries[1].getDB('admin').runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'});

replTest.stopSet();
})();