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https://issues.apache.org/jira/browse/SPARK-20266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964151#comment-15964151
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Jerry.X.He commented on SPARK-20266:
------------------------------------

it seems fixed, but did not found the original reason 
refer : 
http://stackoverflow.com/questions/43315420/executorbackend-blocked-at-usergroupinformation-doas

> ExecutorBackend blocked at "UserGroupInformation.doAs"
> ------------------------------------------------------
>
>                 Key: SPARK-20266
>                 URL: https://issues.apache.org/jira/browse/SPARK-20266
>             Project: Spark
>          Issue Type: Question
>          Components: Project Infra
>    Affects Versions: 1.6.2
>            Reporter: Jerry.X.He
>            Priority: Minor
>         Attachments: logsSubmitByIdeaAtClient.zip, 
> logsSubmitBySparkSubmitAtSlave02.zip
>
>




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