How to Sort Reducer Output? [duplicate]
you can use the composite key and the composite key comparator
create a class e.g.
class Pair(){ String key String value;}and use it in your reducer output like this
context.write(new Pair(key.toString(), Float.toString(result)), null);
then create a comparator
public class PairComparator extends WritableComparator { protected PairComparator() { super(Pair.class, true); } @Override public int compare(WritableComparable w1, WritableComparable w2) { Pair k1 = (Pair)w1; Pair k2 = (Pair)w2; return k1.getValue().compareTo(k2.getValue()); }}and then use the comparator in your job definitionjob.setSortComparatorClass(PairComparator.class);
I didn't check the code above. It just the idea.
I hope it will help