Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/572#discussion_r28696934
--- Diff:
flink-tests/src/test/java/org/apache/flink/test/javaApiOperators/GroupReduceITCase.java
---
@@ -1063,6 +1065,33 @@ public void reduce(Iterable<Tuple5<Integer, Long,
Integer, String, Long>> values
}
+ @Test
+ public void testGroupReduceWithAtomicValue() throws Exception {
+ final ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+ DataSet<Integer> ds = env.fromElements(1, 1, 2, 3, 4);
+ DataSet<Integer> reduceDs = ds.groupBy("*").reduceGroup(new
GroupReduceFunction<Integer, Integer>() {
+ @Override
+ public void reduce(Iterable<Integer> values,
Collector<Integer> out) throws Exception {
+ Set<Integer> set = new HashSet<Integer>();
+ for (Integer i : values) {
+ set.add(i);
+ }
+ for (Integer i : set) {
+ out.collect(i);
+ }
+ }
+ });
+
+ env.setParallelism(1);
--- End diff --
Why do you set the parallelism to 1?
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