Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/12334#issuecomment-209834673
> I think the best way to build for multiple Scala versions in CI is to
just kick off multiple CI builds in parallel or have our bash / Python CI
scripts orchestrate that
That's doable, but my main gripe with the current way cross-compilation is
done is that it requires you to pollute your working file set. You can't just
say "build for Scala 2.10" with just command line options; you have to change
all the poms.
There are ways to reduce the annoyance (e.g. commit the pom changes and
later remember to remove them from the branch), but if the build infrastructure
handled that more cleanly, it would be great.
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