jstests/noPassthrough/ttl_partial_index.js


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// Test that the TTL monitor will correctly use TTL indexes that are also partial indexes.
// SERVER-17984.
(function() {
"use strict";
// Launch mongod with shorter TTL monitor sleep interval.
var runner = MongoRunner.runMongod({setParameter: "ttlMonitorSleepSecs=1"});
var coll = runner.getDB("test").ttl_partial_index;
coll.drop();

// Create TTL partial index.
assert.commandWorked(coll.ensureIndex(
    {x: 1}, {expireAfterSeconds: 0, partialFilterExpression: {z: {$exists: true}}}));

var now = new Date();
assert.writeOK(coll.insert({x: now, z: 2}));
assert.writeOK(coll.insert({x: now}));

// Wait for the TTL monitor to run at least twice (in case we weren't finished setting up our
// collection when it ran the first time).
var ttlPass = coll.getDB().serverStatus().metrics.ttl.passes;
assert.soon(function() {
    return coll.getDB().serverStatus().metrics.ttl.passes >= ttlPass + 2;
}, "TTL monitor didn't run before timing out.");

assert.eq(0,
          coll.find({z: {$exists: true}}).hint({x: 1}).itcount(),
          "Wrong number of documents in partial index, after TTL monitor run");
assert.eq(
    1, coll.find().itcount(), "Wrong number of documents in collection, after TTL monitor run");
MongoRunner.stopMongod(runner);
})();