Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4771#issuecomment-76052585
I'm a little worried that this is treating the symptom and not the problem.
`ApplicationMaster.scala` has a shutdown hook to stop the SparkContext if the
user hasn't done it, and the hook is configured to run before HDFS's (so that
things like this exception wouldn't happen). But that only applies in cluster
mode.
spark-shell (and spark-sql?) runs in client mode, so maybe they're not
properly stopping the SparkContext, or doing it in a way that's racing with
HDFS's shutdown hook?
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