Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/151#issuecomment-49470951
We currently supported two YARN versions - the stable API's in Hadoop
2.2.0+ and the 0.23 release that Yahoo runs internally. The main reason we
support Yahoo 0.23 is that @tgravescs, who is the primary YARN committer on
Spark, has offered to maintain it. I'd love to see us moving away from 0.23
support and only supporting YARN's stable API's. It will depend a bit on what
timeline Yahoo upgrades, Tom might have information on that timeline (?).
In terms of supporting other offshoots of YARN that were packaged by
vendors or in other intermediate releases, my feeling is that unless we have a
committer come and champion this and agree to support it, we shouldn't do it.
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