code: public Set<AllocationID> getAllocationIdsPerJob(JobID jobId) {
  		final Set<AllocationID> allocationIds = slotsPerJob.get(jobId);
  
  		if (allocationIds == null) {
  			return Collections.emptySet();
  		} else {
  			return Collections.unmodifiableSet(allocationIds);
  		}
  	}
docs: Returns the all {@link AllocationID} for the given job.
  
  @param jobId for which to return the set of {@link AllocationID}.
  @return Set of {@link AllocationID} for the given job