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https://issues.apache.org/jira/browse/CASSANDRA-17992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624956#comment-17624956
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Benedict Elliott Smith commented on CASSANDRA-17992:
----------------------------------------------------
{{java.lang.ClassCastException: class
org.apache.cassandra.utils.memory.BufferPool$Chunk cannot be cast to class
sun.nio.ch.DirectBuffer}}
Uh oh. I guess I must have seen this before myself but not looked closely. This
looks more pernicious to me, since it’s a {{BufferPool$Chunk}}. Either the JDK
or Netty are probably unhappy at our use of the attachment field in
{{DirectByteBuffer}}. Looking briefly at the JDK, it is unlikely to be to blame
as there is a JNI constructor for {{DirectByteBuffer}} that accepts a plain
object to hold onto, I guess to ensure that whatever native memory pointer the
buffer references is not collected (and freed by a finalizer/reference queue).
So we're not doing anything unacceptable.
This could be more annoying to resolve. We may need to upstream changes to
Netty, or make quite invasive changes to our {{BufferPool}}.
Getting the full stack trace will help inform next steps.
> Upgrade Netty on 4.x(current trunk)
> -----------------------------------
>
> Key: CASSANDRA-17992
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17992
> Project: Cassandra
> Issue Type: Task
> Components: Dependencies
> Reporter: Ekaterina Dimitrova
> Priority: Low
> Fix For: 4.x
>
>
> 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.
> 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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