Package org.apache.spark.api.java

Examples of org.apache.spark.api.java.JavaDoubleRDD.collect()

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  @Test
  public void map() {
    JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5));
    JavaDoubleRDD doubles = rdd.mapToDouble(x -> 1.0 * x).cache();
    doubles.collect();
    JavaPairRDD<Integer, Integer> pairs = rdd.mapToPair(x -> new Tuple2<Integer, Integer>(x, x))
      .cache();
    pairs.collect();
    JavaRDD<String> strings = rdd.map(x -> x.toString()).cache();
    strings.collect();
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      @Override
      public double call(Integer x) {
        return 1.0 * x;
      }
    }).cache();
    doubles.collect();
    JavaPairRDD<Integer, Integer> pairs = rdd.mapToPair(new PairFunction<Integer, Integer, Integer>() {
      @Override
      public Tuple2<Integer, Integer> call(Integer x) {
        return new Tuple2<Integer, Integer>(x, x);
      }
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  @Test
  public void map() {
    JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5));
    JavaDoubleRDD doubles = rdd.mapToDouble(x -> 1.0 * x).cache();
    doubles.collect();
    JavaPairRDD<Integer, Integer> pairs = rdd.mapToPair(x -> new Tuple2<>(x, x))
      .cache();
    pairs.collect();
    JavaRDD<String> strings = rdd.map(x -> x.toString()).cache();
    strings.collect();
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