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https://issues.apache.org/jira/browse/KAFKA-4181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15496608#comment-15496608
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Matthias J. Sax commented on KAFKA-4181:
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See also http://stackoverflow.com/a/39258140/4953079 and
https://github.com/apache/kafka/pull/1689
> Processors punctuate() methods call multiple times
> --------------------------------------------------
>
> Key: KAFKA-4181
> URL: https://issues.apache.org/jira/browse/KAFKA-4181
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0, 0.10.0.1
> Reporter: James Clinton
> Assignee: Guozhang Wang
>
> I'm seeing odd behaviour whereby a Processor's punctuate(..) method is not
> invoked based on the schedule, but builds up a backlog of pending punctuate()
> calls that get flushed through when the Processors process() method is next
> called.
> So for example:
> 1. Schedule the punctuate() methods to be called every second.
> 2. A minute passes
> 3. Processor.process() receives a new message
> 4. Processor.punctuate(..) is invoked 60 times
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