Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/4688#issuecomment-86193513
Since Spark executors die when the AM dies anyway, work-preserving restart
of the AM is the same as a normal restart as far as spark is concerned.
So when the new AM is created, we will still create new HDFS tokens and
write it out.
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