Rendezvous<Writable> f = (Rendezvous<Writable>) create(loader, name, mapper.toArguments());
Segment segment = stage.getShuffleModel().findSegment(fragment.getInputPorts().get(0));
SegmentedWritable value = createShuffleValue(loader, stage);
ExSummarized ex1 = new ExSummarized();
ex1.setCount(1);
f.begin();
ex1.setValue(10);
setShuffleValue(segment, value, ex1);
f.process(value);
ex1.setValue(20);
setShuffleValue(segment, value, ex1);
f.process(value);
ex1.setValue(30);
setShuffleValue(segment, value, ex1);
f.process(value);
ex1.setValue(40);
setShuffleValue(segment, value, ex1);
f.process(value);
f.end();