@SuppressWarnings("unchecked")
public void run() {
MRRecord<K, V> record;
while (true) {
record = (MRRecord<K, V>) readArbitraryChannel();
if (record == null) {
break;
}
K key = record.getKey();
V value = map(key);
if (combiner == null) {
record.setValue(value);
String destination = getDestination(key);
writeChannel(record, destination);
} else {
combiner.addTuple(key, value);
}
}
flushMap();
shutdown();
}
public int compare(MRRecord<X, Y> first, MRRecord<X, Y> second) {
return first.getValue().compareTo(second.getValue());
}