Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3918#issuecomment-68962515
Well right now versions are managed in the parent POM, on purpose. A
declaration in the child would override a declaration in the parent, if it
existed. Children don't behave differently with respect to precedence of system
properties set on the command line, and profiles. Child POMs do not (in
general) manage versions like this, and shouldn't. But yes 1-3 looks right.
Step 2.5 I believe would be to let `-Dhadoop.version=...` override these values
too.
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