Hi guys,

We have a quite simple generator source:

GenerateSequence.from(0)
        .withRate(1000, Duration.standardSeconds(1L))
        .withTimestampFn((Long l) -> Instant.now())

And after starting in Flink streaming mode, we see that Impulse source is 
switching to FINISHED, while other parts are keep running:

2021-03-03 09:46:40,425 INFO  
org.apache.flink.runtime.executiongraph.ExecutionGraph       [] - Source: 
Impulse (1/1) (4b2b8c75a7c0d62a2fdf8d0cbab9fd68) switched from RUNNING to 
FINISHED.

Can someone explain why it happens? (for example, with KafkaIO source, Impulse 
keeps running as expected).

It is a quite big blocker cause in such way it is not possible to create 
checkpoints/savepoints: https://issues.apache.org/jira/browse/FLINK-2491

Beam 2.28, flink 1.11

Best regards,

Dmytro Dragan | dd...@softserveinc.com<mailto:dd...@softserveinc.com> | Lead 
Big Data Engineer| SoftServe<http://www.softserveinc.com/>


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