Github user steveloughran commented on the issue:
    I don't know what the default Hadoop version should be, that's the kind of 
thing to discuss on mailing lists
    personally, I'd rush to make 2.6 the bare minimum version; nobody should be 
using anything below, especially given JVM requirements mean that you can't 
easily go below that.  (Twitter are still using 2.6 and leading the 2.6.5 
release BTW; they are the main 2.6 user that I know of).
    One thing that would be good would be for jenkins to test on a later 
profile alongside the bare minimum version considered supportable. Testing with 
old version: ensures that you don' t accidentally code for later APIs. Testing 
with newer version: ensures that any module built for the later versions only 
work, *and catch regressions in Hadoop itself*.

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