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https://issues.apache.org/jira/browse/SPARK-27812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16886359#comment-16886359
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Imran Rashid commented on SPARK-27812:
--------------------------------------

as mentioned elsewhere, installing an uncaught exception handler on the driver 
is not great because it can mess with usercode in the driver.  Maybe we can 
make it configurable – by default, only install one if there is no uncaught 
exception handler already installed?  No great solution here ...

> 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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