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https://issues.apache.org/jira/browse/SPARK-29971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978207#comment-16978207
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Norman Maurer commented on SPARK-29971:
---------------------------------------

I am pretty sure the same bug exists in all versions that use netty so you may 
need to adjust the "affected versions"

> Multiple possible buffer leaks in TransportFrameDecoder and TransportCipher
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-29971
>                 URL: https://issues.apache.org/jira/browse/SPARK-29971
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.4.4, 3.0.0
>            Reporter: Norman Maurer
>            Priority: Major
>
> TransportFrameDecoder and TransportCipher currently not carefully manage the 
> life-cycle of ByteBuf instances and so leak memory in some cases.



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