Github user zhzhan commented on the pull request:
https://github.com/apache/spark/pull/3409#issuecomment-65140650
@vanzin As described in the PR, if the mapred-site.xml use the system
property, it will break spark. It is not usability regression, as it does not
impact any current behavior. How to use it depends on different hadoop
distribution, and I don't think it can be automatically propagated, as it is
related to how different hadoop distributions wrap their specific
mapred-site.xml.
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