Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1550#issuecomment-50279335
After some thought, I'd prefer not to force stylce checking when the
`package` target is run. Many distributors fork the Spark build and modify
things, I don't want to impose on them having to meet our internal style
guidelines or they get a build failure.
I think it's fine to just support `mvn install; mvn scalastyle:check`.
Another alternative is, we could add a profile `-Pscalastyle` that enables
checking when package is run.
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