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https://issues.apache.org/jira/browse/SPARK-28657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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hong dongdong updated SPARK-28657:
----------------------------------
    Description: 
When run spark on yarn, I got 

java.lang.ClassCastException: org.apache.hadoop.ipc.CallerContext$Builder 
cannot be cast to scala.runtime.Nothing$ 

!image-2019-08-08-17-39-19-552.png!

  was:
When run spark on yarn, I got 

"""

java.lang.ClassCastException: org.apache.hadoop.ipc.CallerContext$Builder 
cannot be cast to scala.runtime.Nothing$

"""

 

!image-2019-08-08-17-39-19-552.png!


> Fix currentContext Instance failed sometimes
> --------------------------------------------
>
>                 Key: SPARK-28657
>                 URL: https://issues.apache.org/jira/browse/SPARK-28657
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 3.0.0
>         Environment:  
>  
>            Reporter: hong dongdong
>            Priority: Minor
>
> When run spark on yarn, I got 
> java.lang.ClassCastException: org.apache.hadoop.ipc.CallerContext$Builder 
> cannot be cast to scala.runtime.Nothing$ 
> !image-2019-08-08-17-39-19-552.png!



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