Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/151#issuecomment-38107337
As you say, it is a yarn thing, but yarn was alpha/beta before the 2.2.0
release with no api guarantees. YARN 0.23 was also a stable release. I would
definitely hesitate about supporting all the various combinations of releases
between those. Any user could have checked out hadoop at any time and built it
and ended up with any combination of api changes. I think we should pick them
ones we want to support. Even with just the 2 of them the building and
testing of things takes a lot of time.
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