Abacn opened a new issue, #22776:
URL: https://github.com/apache/beam/issues/22776
### What happened?
Draining a pipeline with source from PeriodicImpulse never ends. This
happens for both Java and Python sdk.
In contrast, similar functionality GenericSequence which existing in Java
supports drain.
Code snippets:
```
public class PeriodicImpulseTest {
public static void main(String[] argv) {
PipelineOptions options =
PipelineOptionsFactory.fromArgs(argv).withValidation().as(PipelineOptions.class);
Pipeline p = Pipeline.create(options);
PCollection<Void> result =
p.apply(PeriodicImpulse.create().withInterval(Duration.millis(500)))
.apply(Reshuffle.viaRandomKey())
.apply(ParDo.of(new DoFn<Instant, Void>() {
@ProcessElement
public void processElement(DoFn<Instant, Void>.ProcessContext
c){
System.out.println(c.element());
}}
));
assertThat(result.isBounded(), equalTo(IsBounded.UNBOUNDED));
p.run().waitUntilFinish();
}
}
```
Successful implementation using GenericSequence:
```
public class GenerateSequenceTest {
public static void main(String[] argv) {
PipelineOptions options =
PipelineOptionsFactory.fromArgs(argv).withValidation().as(PipelineOptions.class);
Pipeline p = Pipeline.create(options);
PCollection<Long> input = p.apply(GenerateSequence.from(0).withRate(1,
Duration.standardSeconds(1)));
input.apply(ParDo.of(new DoFn<Long, Void>() {
@ProcessElement
public void processElement(DoFn<Long, Void>.ProcessContext c){
System.out.println(c.element());
}}
));
p.run();
}
}
```
### Issue Priority
Priority: 2
### Issue Component
Component: sdk-java-core
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