void function ( ) { }
this method is executed once per superstep after the vertex update function has been invoked for each vertex . concode_field_sep IterationRuntimeContext runtimeContext concode_elem_sep long numberOfVertices concode_field_sep T getPreviousIterationAggregate concode_elem_sep void init concode_elem_sep T getIterationAggregator concode_elem_sep int getSuperstepNumber concode_elem_sep void preSuperstep concode_elem_sep Collection<T> getBroadcastSet concode_elem_sep long getNumberOfVertices concode_elem_sep void setNumberOfVertices concode_elem_sep M sum