ISPN-4334 MapReduceTaskLifecycleService shouldn't keep the list of found...

Master only. Adrian Nistor (and other volunteers) should review. See https://issues.jboss.org/browse/ISPN-4334 for more details
I'd ask the same. But if it turns out you really need a new List instance, make sure to allocate the right size of the list rather than having the ArrayList need to grow dynamically.