Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/11358#issuecomment-188621725
This looks like it might affect HDFS tokens as well and error that looks
like this might come up during the initial token renewal:
```
WARN UserGroupInformation: PriviledgedActionException as:hari (auth:PROXY)
via hdfs@EXAMPLE (auth:KERBEROS)
cause:org.apache.hadoop.security.AccessControlException: hari tries to renew a
token with renewer hdfs
```
In addition to the code that gets the new tokens, I think the
[`getTokenRenewalInterval`](https://github.com/apache/spark/blob/master/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala#L580)
method also needs to be be run as the real user.
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