Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4292#issuecomment-72605117
I found some [previous
discussion](https://issues.apache.org/jira/browse/SPARK-2546?focusedCommentId=14160842&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14160842)
of this issue.
I'd say that expecting `sc.hadoopConfiguration` to be mutated by users
after it's already been used to define RDDs isn't something that we can /
should realistically hope to support because there's just way too many ways
that it could break (e.g. defensive copying, serialization, etc) and because it
runs counter to user expectations around other types of Spark configurations
(e.g. user modifications to SparkConf after creating SparkContext will not take
effect).
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