A rather more general question is - assume I have an JavaRDD<K> which is
sorted -
How can I convert this into a JavaPairRDD<Integer,K> where the Integer is
tie index -> 0...N - 1.
Easy to do on one machine
JavaRDD<K> values = ... // create here
JavaRDD<Integer,K> positions = values.mapToPair(new PairFunction<K,
Integer, K>() {
private int index = 0;
@Override
public Tuple2<Integer, K> call(final K t) throws Exception {
return new Tuple2(index++,t);
}
});
but will this code do the right thing on a cluster
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