Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/14827
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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