mongo/jstests/serial_run/index_multi.js

// Attempt to build 63 indexes simultaneously
const conn = MongoRunner.runMongod({});
assert.neq(null, conn, "unable to start mongod");
const db = conn.getDB("index_multi");

Random.setRandomSeed();

let coll = db.index_multi;
coll.drop();
db.results.drop();

let bulk = coll.initializeUnorderedBulkOp();
print("Populate the collection with random data");
for (var i = 0; i < 1e4; i++) {
    let doc = {"_id": i};

    for (let j = 0; j < 100; j++) {
        // Skip some of the fields
        if (Random.rand() < 0.1) {
            continue;
        }
        // Make 0, 10, etc. multikey indexes
        else if (j % 10 == 0) {
            doc["field" + j] = [Random.rand(), Random.rand(), Random.rand()];
        } else {
            doc["field" + j] = Random.rand();
        }
    }

    bulk.insert(doc);
}
assert.commandWorked(bulk.execute());

// Array of all index specs
let specs = [];
let multikey = [];

let setupDBStr =
    "var conn = null;" +
    "assert.soon(function() {" +
    "  try {" +
    '    conn = new Mongo("' +
    db.getMongo().host +
    '");' +
    "    return conn;" +
    "  } catch (x) {" +
    "    return false;" +
    "  }" +
    "}, 'Timed out waiting for temporary connection to connect', 30000, 5000);" +
    "var db = conn.getDB('" +
    db.getName() +
    "');";

let indexJobs = [];
print("Create 3 triple indexes");
for (var i = 90; i < 93; i++) {
    var spec = {};
    spec["field" + i] = 1;
    spec["field" + (i + 1)] = 1;
    spec["field" + (i + 2)] = 1;
    indexJobs.push(
        startParallelShell(
            setupDBStr +
                "printjson(db.index_multi.createIndex(" +
                tojson(spec) +
                "));" +
                "db.results.insert(Object.extend(" +
                "db.runCommand({ getlasterror: 1 }), " +
                tojson(spec) +
                ") );",
            null, // port
            true,
        ),
    ); // noconnect
    specs.push(spec);
    multikey.push(i % 10 == 0 || (i + 1) % 10 == 0 || (i + 2) % 10 == 0);
}

print("Create 30 compound indexes");
for (var i = 30; i < 90; i += 2) {
    var spec = {};
    spec["field" + i] = 1;
    spec["field" + (i + 1)] = 1;
    indexJobs.push(
        startParallelShell(
            setupDBStr +
                "printjson(db.index_multi.createIndex(" +
                tojson(spec) +
                "));" +
                "db.results.insert(Object.extend(" +
                "db.runCommand({ getlasterror: 1 }), " +
                tojson(spec) +
                ") );",
            null, // port
            true,
        ),
    ); // noconnect
    specs.push(spec);
    multikey.push(i % 10 == 0 || (i + 1) % 10 == 0);
}

print("Create 30 indexes");
for (var i = 0; i < 30; i++) {
    var spec = {};
    spec["field" + i] = 1;
    indexJobs.push(
        startParallelShell(
            setupDBStr +
                "printjson(db.index_multi.createIndex(" +
                tojson(spec) +
                "));" +
                "db.results.insert(Object.extend(" +
                "db.runCommand({ getlasterror: 1 }), " +
                tojson(spec) +
                ") );",
            null, // port
            true,
        ),
    ); // noconnect
    specs.push(spec);
    multikey.push(i % 10 == 0);
}

print("Do some sets and unsets");
bulk = coll.initializeUnorderedBulkOp();
for (i = 0; i < 1e4; i++) {
    let criteria = {_id: Random.randInt(1e5)};
    let mod = {};
    if (Random.rand() < 0.5) {
        mod["$set"] = {};
        mod["$set"]["field" + Random.randInt(100)] = Random.rand();
    } else {
        mod["$unset"] = {};
        mod["$unset"]["field" + Random.randInt(100)] = true;
    }

    bulk.find(criteria).update(mod);
}
assert.commandWorked(bulk.execute());

indexJobs.forEach(function (join) {
    join();
});

printjson(db.results.find().toArray());
// assert.eq(coll.getIndexes().length, 64, "didn't see 64 indexes");

print("Make sure we end up with 64 indexes");
for (var i in specs) {
    let explain = coll.find().hint(specs[i]).explain();
    assert("queryPlanner" in explain, tojson(explain));
}

print("SUCCESS!");

MongoRunner.stopMongod(conn);