Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3938#issuecomment-69106242
Well, either choice (forcing it down to 1.8.8 or up to 1.9.13) is dangerous
if the library doesn't have strict compatibility guarantees. If it's reasonably
compatible - that is, if newer versions have strictly new APIs and didn't
change or remove any old ones, forcing the version up would be best.
So I guess forcing the version up is ok if hadoop-2.4 libraries are ok with
it. I haven't tested that case, though, so that's my only concern here.
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