Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/4688#issuecomment-97212368
It looks like tokens can be renewed only if the user is logged in via
Kerberos, which is not the case for executors. So this method to calculate
renewal intervals on the executor is failing. How about figuring out the
renewal interval in `Client.scala` and then using `sparkConf` to pass it
around? This way, we don't have to find it out on each executor.
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