MyContainerAllocator allocator = (MyContainerAllocator) mrApp
.getContainerAllocator();
mrApp.waitForInternalState((JobImpl) job, JobStateInternal.RUNNING);
amDispatcher.await();
// Wait till all map-attempts request for containers
for (Task t : job.getTasks().values()) {
if (t.getType() == TaskType.MAP) {
mrApp.waitForInternalState((TaskAttemptImpl) t.getAttempts().values()
.iterator().next(), TaskAttemptStateInternal.UNASSIGNED);