question: public void combineSets ( HashMap < String , Set < String > > containerAffinities , OperatorPair pair ) { Set < String > set1 = containerAffinities . get ( pair . first ) ; Set < String > set2 = containerAffinities . get ( pair . second ) ; set1 . addAll ( set2 ) ; containerAffinities . put ( pair . first , set1 ) ; containerAffinities . put ( pair . second , set1 ) ; }
target:  Combine affinity sets for operators with affinity