Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/4452#issuecomment-74140364
In general there aren't really any strict rules for how far a patch should
be back ported. One thing though is that it is much less likely for us to do
more releases on older branches like 0.9, and people don't generally expect it
either but instead may opt to upgrade to newer minor releases, which is
desirable. So I'd say we usually just determine this on a case by case basis.
For this particular patch it is definitely relevant for 1.2. For older
branches, however, I believe a stable version of Hadoop 2.5 may not even have
been released yet, so I wonder how much of a relevance there is. There will
likely be nontrivial merge conflicts for branch-1.2 since we removed alpha
support in 1.3 and refactored the YARN code quite a bit. Would you mind opening
this PR against the 1.2 branch nevertheless?
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