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https://issues.apache.org/jira/browse/KAFKA-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313374#comment-15313374
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Tom Rybak commented on KAFKA-3784:
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I made a pull request with the fix, plus a unit test that can be used to verify
that the problem used to exist.
https://github.com/apache/kafka/pull/1462
> TimeWindows#windowsFor misidentifies some windows if TimeWindows#advanceBy is
> used
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-3784
> URL: https://issues.apache.org/jira/browse/KAFKA-3784
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.10.0.0
> Reporter: Tom Rybak
> Priority: Minor
>
> Using a time window of size 6 minutes with a 5 minute advanceBy results in
> some of the timestamped data being inserted into the previous overlapping
> window even though the event's timestamp > that window's end time.
> The fault lies in TimeWindows#windowsFor which does not check that all the
> windows it's adding have an endTime > event's timestamp.
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