Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/926#issuecomment-44744710
Yeah I think it's essential to not prevent `-Dspark.master=...` from
working, oops. I think it may be useful to have this work if one
copies-and-pastes too, as I just did. The javadoc doesn't indicate that you
have to set the master either. I will rework it to use `setIfMissing()`
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