question: public StashRowIterable ( ) { _initialIterator = createStashRowIterator ( ) ; try { _initialIterator . hasNext ( ) ; _openIterators . add ( _initialIterator ) ; } catch ( Exception e ) { try { Closeables . close ( _initialIterator , true ) ; } catch ( IOException e2 ) { } throw Throwables . propagate ( e ) ; } }
target:  In order to fail fast create the initial iterator on instantiation.  This way exceptions such as TableNotStashedException will be thrown immediately and not deferred until the first iteration.