code: void unregisterJob(final ExecutionGraph eg) {
  
  		final Iterator<ExecutionVertex> it = new ExecutionGraphIterator(eg, true);
  		while (it.hasNext()) {
  			this.splitMap.remove(it.next().getID());
  		}
  	}
docs: Unregisters a job from the input split tracker.
  
  @param eg
  the execution graph of the job to be unregistered