Github user cmccabe commented on the pull request:
https://github.com/apache/spark/pull/1486#issuecomment-50209723
I took a look at rewriting this to avoid the reflection, and use
conditional compilation instead. Unfortunately, I think it just increased the
complexity. Since some of the APIs we need here are only in hadoop2.5 and
higher, we'd have to have a Maven profile like "hadoop2.5_and_higher", which
just seems awkward given that we already have Phadoop2.4, Phadoop2.3, etc. So
I think reflection might be a necessary evil for right now.
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