Java Code Examples for org.apache.spark.api.java.JavaPairRDD#repartitionAndSortWithinPartitions()

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Example 1
Source File: TransformTranslator.java    From beam with Apache License 2.0 5 votes vote down vote up 
private static <K, V, OutputT> JavaPairRDD<TupleTag<?>, WindowedValue<?>> statefulParDoTransform(
    KvCoder<K, V> kvCoder,
    Coder<? extends BoundedWindow> windowCoder,
    JavaRDD<WindowedValue<KV<K, V>>> kvInRDD,
    Partitioner partitioner,
    MultiDoFnFunction<KV<K, V>, OutputT> doFnFunction,
    boolean requiresSortedInput) {
  Coder<K> keyCoder = kvCoder.getKeyCoder();

  final WindowedValue.WindowedValueCoder<V> wvCoder =
      WindowedValue.FullWindowedValueCoder.of(kvCoder.getValueCoder(), windowCoder);

  if (!requiresSortedInput) {
    return GroupCombineFunctions.groupByKeyOnly(kvInRDD, keyCoder, wvCoder, partitioner)
        .map(
            input -> {
              final K key = input.getKey();
              Iterable<WindowedValue<V>> value = input.getValue();
              return FluentIterable.from(value)
                  .transform(
                      windowedValue ->
                          windowedValue.withValue(KV.of(key, windowedValue.getValue())))
                  .iterator();
            })
        .flatMapToPair(doFnFunction);
  }

  JavaPairRDD<ByteArray, byte[]> pairRDD =
      kvInRDD
          .map(new ReifyTimestampsAndWindowsFunction<>())
          .mapToPair(TranslationUtils.toPairFunction())
          .mapToPair(
              CoderHelpers.toByteFunctionWithTs(keyCoder, wvCoder, in -> in._2().getTimestamp()));

  JavaPairRDD<ByteArray, byte[]> sorted =
      pairRDD.repartitionAndSortWithinPartitions(keyPrefixPartitionerFrom(partitioner));

  return sorted.mapPartitionsToPair(wrapDoFnFromSortedRDD(doFnFunction, keyCoder, wvCoder));
}