Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2194#discussion_r17016536
--- Diff: core/src/test/java/org/apache/spark/JavaAPISuite.java ---
@@ -708,6 +708,104 @@ public void mapPartitions() {
}
@Test
+ public void mapPartitionsWithContext() {
+ JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4), 2);
+ JavaRDD<String> partitionSumsWithContext =
rdd.mapPartitionsWithContext(
+ new Function2<TaskContext, Iterator<Integer>, Iterator<String>>() {
+ @Override
+ public Iterator<String> call(TaskContext context,
+ Iterator<Integer> iter) throws Exception {
+
+ int sum = 0;
+ while (iter.hasNext()) {
+ sum += iter.next();
+ }
+ return Collections.singletonList(sum + "-partition-" +
context.partitionId()).iterator();
+ }
+ }, false);
+ Assert.assertEquals("[3-partition-0, 7-partition-1]",
+ partitionSumsWithContext.collect().toString());
+ }
+
+ @Test
+ public void mapPartitionsToPair() {
+ JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4), 2);
+ JavaPairRDD<Integer, String> pairRdd = rdd.mapPartitionsToPair(
+ new PairFlatMapFunction<Iterator<Integer>, Integer, String>() {
+ @Override
+ public Iterable<Tuple2<Integer, String>> call(Iterator<Integer>
iter) throws Exception {
+ int sum = 0;
+ while (iter.hasNext()) {
+ sum += iter.next();
+ }
+ return Collections.singletonList(new Tuple2<Integer,
String>(sum, "a"));
+ }
+ }
+ );
+
+ Assert.assertEquals("[(3,a), (7,a)]", pairRdd.collect().toString());
+ }
+
+ @Test
+ public void mapPartitionsToPairWithContext() {
+ JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4), 2);
+ JavaPairRDD<Integer, String> pairRdd =
rdd.mapPartitionsToPairWithContext(
+ new PairFlatMapFunction2<TaskContext, Iterator<Integer>, Integer,
String>() {
+ @Override
+ public Iterable<Tuple2<Integer, String>> call(TaskContext context,
Iterator<Integer> iter)
+ throws Exception {
+
+ int sum = 0;
+ while (iter.hasNext()) {
+ sum += iter.next();
+ }
+ return Collections.singletonList(
+ new Tuple2<Integer, String>(sum, "partition-" +
context.partitionId()));
+ }
+ }, false);
+
+ Assert.assertEquals("[(3,partition-0), (7,partition-1)]",
pairRdd.collect().toString());
+ }
+
+ @Test
+ public void mapPartitionsToDouble() {
--- End diff --
remove this once you remove the api above
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