code: protected final void setResultIteratorException(IOException ioex) {
  		synchronized (this.iteratorLock) {
  			if (this.iteratorException == null) {
  				this.iteratorException = ioex;
  				this.iteratorLock.notifyAll();
  			}
  		}
  	}
docs: Reports an exception to all threads that are waiting for the result iterator.
  
  @param ioex The exception to be reported to the threads that wait for the result iterator.