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https://issues.apache.org/jira/browse/KAFKA-19748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18024703#comment-18024703
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Matthias J. Sax commented on KAFKA-19748:
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Yes, the upgrade-guide would be the right place. I would also add a note to the
top-level upgrade note in addition:
[https://github.com/apache/kafka/blob/trunk/docs/upgrade.html#L194]
> Memory leak using range scans
> -----------------------------
>
> Key: KAFKA-19748
> URL: https://issues.apache.org/jira/browse/KAFKA-19748
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 4.1.0
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Blocker
> Fix For: 4.2.0, 4.1.1
>
>
> We introduced a regression bug in AK 4.1.0 release, when range scans are use.
> We are leaking some metrics/sensors.
> Thanks to [~eduwerc] and [~hermankj] for reporting this issue.
> Anybody who is using iterator, ie, any type of all/rang/prefix scan etc is
> affected. Note that certain DSL operators like session-windows,
> sliding-windows, stream-stream joins, and FK-join all use range scans
> internally, so the number of affected users is expected to be quite high.
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