Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4292#issuecomment-72603238
Ugh, I just realized that this might potentially regress behavior for some
weird corner-cases that arise due to our shared mutable `hadoopConfiguration`.
A common use-case for `sc.hadoopConfiguration` is to pass credentials for S3
filesystems. The problem that crops up is when a user has already defined a
bunch of RDDs and then mutates the configuration to pass credentials: in this
case, I think this patch will break those user programs because modifications
to the `hadoopConfiguration` won't be reflected in the `JobConf`.
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