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https://issues.apache.org/jira/browse/KAFKA-6213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-6213.
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Resolution: Not A Problem
> Stream processor receives messages after close() is invoked
> -----------------------------------------------------------
>
> Key: KAFKA-6213
> URL: https://issues.apache.org/jira/browse/KAFKA-6213
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.11.0.1
> Reporter: Bart De Vylder
>
> I think it is not expected or desirable that a processor receives messages
> (through its {{process}} method) after {{close}} has been invoked.
> Scenario that triggered the behavior:
> We have a topic with 2 partitions and a simple streaming app:
> {code}
> builder.stream(topic)
> .process(() -> new SomeProcessor());
> {code}
> Then we create one instance of this application, this triggers the
> construction of 2 SomeProcessor instances in that application. Next we start
> a second application, which triggers the rebalance of the partitions. It was
> observed that both existing SomeProcessor instances in the first application
> received a {{close}} call. However, after the {{close}} method was invoked,
> no new SomeProcessor was constructed and the {{process}} method of one of the
> existing (and closed) ones is still being invoked.
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