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https://issues.apache.org/jira/browse/KAFKA-3555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-3555.
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Resolution: Not A Bug
This is related to KAFKA-3559. The observation itself is not a bug.
> Unexpected close of KStreams transformer
> -----------------------------------------
>
> Key: KAFKA-3555
> URL: https://issues.apache.org/jira/browse/KAFKA-3555
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0
> Reporter: Anna Povzner
> Assignee: Guozhang Wang
>
> I consistently get this behavior when running my system test that runs 1-node
> kafka cluster.
> We implemented TransformerSupplier, and the topology is
> transform().filter().map().filter().aggregate(). I have a log message in my
> transformer's close() method. On every run of the test, I see that after
> running 10-20 seconds, transformer's close() is called. Then, in about 20
> seconds, I see that transformer is re-initialized and continues running.
> I don't see any exceptions happening in KStreams before close() happens.
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