Github user sarutak commented on the issue:
https://github.com/apache/spark/pull/13738
@tgravescs I didn't debug against 1.4 but I think the reason why 1.5+ can
throw UnknownHostException while 1.4 works successfully is related to the
difference between `SerializableWritable` and `SerializableConfiguration`. The
former allow executor to load hdfs-site.xml even if driver doesn't load it but
the latter disallow executor to load it. In 1.4, `SerializableWritable` is
used and in 1.5+, `SerializableConfiguration` is used in `HadoopRDD`.
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