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https://issues.apache.org/jira/browse/HIVE-12043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944652#comment-14944652
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Siddharth Seth commented on HIVE-12043:
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This is linked to thread creation. The UGI used to create the thread remains
active throughout the life of the thread.
https://docs.oracle.com/javase/7/docs/api/javax/security/auth/Subject.html#doAs(javax.security.auth.Subject,%20java.security.PrivilegedExceptionAction)
> UGI instances being used in IO elevator threads are incorrect
> -------------------------------------------------------------
>
> Key: HIVE-12043
> URL: https://issues.apache.org/jira/browse/HIVE-12043
> Project: Hive
> Issue Type: Sub-task
> Reporter: Siddharth Seth
> Assignee: Siddharth Seth
>
> ... which leads to FileSystem closed exceptions.
> I'm not sure yet if this is a result of the threadpool being used, and UGI
> not working well with threadpools, or something else.
> The UGI instance which was setup - at what looks to be thread creation time -
> ends up being used for several different reads, ignoring the actual UGI
> passed in. At some point this changes to a new incorrect UGI.
> A simple fix is to propagate the correct UGI all the way to the reader, and
> that fixes the FileSystem Closed exception. Figuring out the precise reason
> would be good though.
> Related to HIVE-9898.
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