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Ewen Cheslack-Postava commented on KAFKA-6127:
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Isn't a basic `poll()` also an issue since it blocks on group membership?
> Streams should never block infinitely
> -------------------------------------
>
> Key: KAFKA-6127
> URL: https://issues.apache.org/jira/browse/KAFKA-6127
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Matthias J. Sax
> Priority: Major
>
> Streams uses three consumer APIs that can block infinite: {{commitSync()}}, {{committed()}},
and {{position()}}.
> If we block within one operation, the whole {{StreamThread}} would block, and the instance
does not make any progress, becomes unresponsive (for example, {{KafkaStreams#close()}} suffers),
and we also might drop out of the consumer group.
> We might consider to use {{wakeup()}} calls to unblock those operations to keep {{StreamThread}}
in a responsive state.
> Note: there are discussion to add timeout to those calls, and thus, we could get {{TimeoutExceptions}}.
This would be easier to handle than using {{wakeup()}}. Thus, we should keep an eye on those
discussions.
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