Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1338#issuecomment-50208947
@kanzhang I think it's unsafe to unpersist the read job's Hadoop
configuration. Even if we cached the results of the read, I think we'd still
need to keep a copy of the configuration in case any of those cached partitions
are lost and we need to recompute from scratch.
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