Cai Liuyang created FLINK-32362:
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Summary: SourceAlignment announceCombinedWatermark period task
maybe lost
Key: FLINK-32362
URL: https://issues.apache.org/jira/browse/FLINK-32362
Project: Flink
Issue Type: Bug
Affects Versions: 1.16.0
Reporter: Cai Liuyang
When we use sourcealignment，we also found there is another problem that
announceCombinedWatermark may throw a exception (like "subtask 25 is not ready
yet to receive events" , this subtask maybe under failover), which will lead
the period task not running any more (ThreadPoolExecutor will not schedule the
period task if it throw a exception)
I think we should increase the robustness of announceCombinedWatermark function
to avoid it throw any exception (if send fail, just wait next send) (code see
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/source/coordinator/SourceCoordinator.java#L199]
)
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