Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8437#issuecomment-140536012
For the curious, the issue is that the junit test runners (both surefire
and the sbt one) need the tag classes around or they'll throw an error, and
that happens when building modules where the tag is not available. I'm thinking
about a workaround that does not involve removing the junit functionality.
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