Add JavaRDDLike.keyBy.
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@ -298,4 +298,12 @@ trait JavaRDDLike[T, This <: JavaRDDLike[T, This]] extends Serializable {
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* Save this RDD as a SequenceFile of serialized objects.
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*/
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def saveAsObjectFile(path: String) = rdd.saveAsObjectFile(path)
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/**
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* Creates tuples of the elements in this RDD by applying `f`.
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*/
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def keyBy[K](f: JFunction[T, K]): JavaPairRDD[K, T] = {
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implicit val kcm: ClassManifest[K] = implicitly[ClassManifest[AnyRef]].asInstanceOf[ClassManifest[K]]
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JavaPairRDD.fromRDD(rdd.keyBy(f))
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}
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}
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@ -629,4 +629,16 @@ public class JavaAPISuite implements Serializable {
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floatAccum.setValue(5.0f);
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Assert.assertEquals((Float) 5.0f, floatAccum.value());
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}
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@Test
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public void keyBy() {
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JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2));
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List<Tuple2<String, Integer>> s = rdd.keyBy(new Function<Integer, String>() {
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public String call(Integer t) throws Exception {
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return t.toString();
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}
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}).collect();
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Assert.assertEquals(new Tuple2<String, Integer>("1", 1), s.get(0));
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Assert.assertEquals(new Tuple2<String, Integer>("2", 2), s.get(1));
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}
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}
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