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https://issues.apache.org/jira/browse/CASSANDRA-17992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17748432#comment-17748432
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Jacek Lewandowski commented on CASSANDRA-17992:
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The last commit fixed the issue:
https://github.com/apache/cassandra/pull/2493/commits/a2e0de4262f686ebf39e4b02b6078e5fd0d39372
It seems like it was not the first one - I've noticed that simulator tests
cluster implementation has already defined some other shared classes from
Netty. I've just added {{FastThreadLocal}} there so the fix works only for
simulation dtests while jvm dtests remains untouched.
> Upgrade Netty on 5.0
> --------------------
>
> Key: CASSANDRA-17992
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17992
> Project: Cassandra
> Issue Type: Task
> Components: Dependencies
> Reporter: Ekaterina Dimitrova
> Assignee: Jacek Lewandowski
> Priority: Low
> Fix For: 5.x
>
> Attachments: important-netty-inter-releases.md,
> netty-release-notes-filtered.md, netty-release-notes.md
>
>
> I haven't been able to identify from the Netty docs which was the lowest
> version where JDK17 was added but we are about 40 versions behind in netty 4
> so I suspect we better update.
> -We need to consider there was an issue with class cast exceptions when
> building with JDK17 with newer versions of netty (the newest available in
> March 2022). For the record, we didn't see those when running CI on JDK8 and
> JDK11. We also need to carefully revise the changes between the netty
> versions. -->- CASSANDRA-18180
> Upgrading will cover also a fix in netty that was discussed in
> [this|https://the-asf.slack.com/archives/CK23JSY2K/p1665567660202989] ASF
> Slack thread.
> CC [~benedict] , [~aleksey]
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