code: @Nullable
  	public JobID getOwningJob(AllocationID allocationId) {
  		final TaskSlot taskSlot = getTaskSlot(allocationId);
  
  		if (taskSlot != null) {
  			return taskSlot.getJobId();
  		} else {
  			return null;
  		}
  	}
docs: Returns the owning job of the {@link TaskSlot} identified by the
  given {@link AllocationID}.
  
  @param allocationId identifying the slot for which to retrieve the owning job
  @return Owning job of the specified {@link TaskSlot} or null if there is no slot for
  the given allocation id or if the slot has no owning job assigned