Matthias J. Sax created KAFKA-6127:
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Summary: 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
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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