Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/9635#issuecomment-158255349
It is not really the token that is causing the issue. It looks like UGI of
the current user has expired kerberos tickets. Anyway, this patch does not make
things worse, I am just unsure it actually fixes the issue at hand. I am not
really sure what the issue is - within the same process this should not happen
for a long time.
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