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https://issues.apache.org/jira/browse/SPARK-27812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892037#comment-16892037
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Erik Erlandson commented on SPARK-27812:
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Agreed with [~skonto] that downgrading isn't a good option.  We need to keep 
abreast of K8s (and the api) over time. Invoking sys.exit in theory seems a bit 
heavy handed, BUT it's also better than just hanging, and I don't know how one 
would manage a controlled unwind of a deadlock.

> kubernetes client import non-daemon thread which block jvm exit.
> ----------------------------------------------------------------
>
>                 Key: SPARK-27812
>                 URL: https://issues.apache.org/jira/browse/SPARK-27812
>             Project: Spark
>          Issue Type: Bug
>          Components: Kubernetes
>    Affects Versions: 2.4.3
>            Reporter: Henry Yu
>            Priority: Major
>
> I try spark-submit to k8s with cluster mode. Driver pod failed to exit with 
> An Okhttp Websocket Non-Daemon Thread.
>  



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