Github user jaceklaskowski commented on the pull request: https://github.com/apache/spark/pull/8976#issuecomment-146474747 Fully agree. I'm however not skilled to work on the feature to enable locality preference and haven't heard about anyone working on it, and the code as it is now is *not* used and is misleading. That said, I'd remove it and bring back when it's needed (the comments do more harm than offer help). BTW, It's all versioned in the repo and one can easily revert to any version in the past when needed.
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