Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/2638#issuecomment-57791903
A particular instance of Spark will be built for a particular version of
Hadoop and/or YARN. It is not at this point a universal binary anyway, and so,
I do not think it is necessary to add this indirection via reflection. That is,
if you are deploying on Hadoop 1, you need to build Spark for Hadoop 1, and
similarly for Hadoop 2.
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