amaliujia commented on a change in pull request #16012:
URL: https://github.com/apache/beam/pull/16012#discussion_r762314327
##########
File path:
sdks/java/testing/nexmark/src/main/java/org/apache/beam/sdk/nexmark/queries/Query13.java
##########
@@ -57,19 +57,8 @@ public Query13(NexmarkConfiguration configuration) {
final Coder<Event> coder = events.getCoder();
return events
.apply("Pair with random key", ParDo.of(new
AssignShardFn<>(configuration.numKeyBuckets)))
- .apply(GroupByKey.create())
- .apply(
- "ExpandIterable",
- ParDo.of(
- new DoFn<KV<Integer, Iterable<Event>>, Event>() {
- @ProcessElement
- public void processElement(
- @Element KV<Integer, Iterable<Event>> element,
OutputReceiver<Event> r) {
- for (Event value : element.getValue()) {
- r.output(value);
- }
- }
- }))
+ .apply(Reshuffle.of())
Review comment:
There was a purpose of using GBK not reshuffle.
Reshuffle is composed PTransform that uses non-standard windows, thus it
lose the chance to hit some optimizations.
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