Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7255#issuecomment-120147763
Last version LGTM. The only minor worry I have is that this may cause
multiple logins within some small time window (e.g. user kinits then calls
spark-submit, or multiple spark-submit calls in a small period), which may
cause login failures. But that issue already existed before in yarn-cluster
mode.
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