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https://issues.apache.org/jira/browse/SPARK-9596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14653576#comment-14653576
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Apache Spark commented on SPARK-9596:
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User 'WangTaoTheTonic' has created a pull request for this issue:
https://github.com/apache/spark/pull/7931
> Avoid reloading Hadoop classes like UserGroupInformation
> --------------------------------------------------------
>
> Key: SPARK-9596
> URL: https://issues.apache.org/jira/browse/SPARK-9596
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Tao Wang
>
> Some hadoop classes contains global information such as authentication in
> UserGroupInformation. If we load them again in `IsolatedClientLoader`, the
> message they carry will be dropped.
> So we should treat hadoop classes as "shared" too.
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