Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/4567#issuecomment-76315240
I think `--` might be more appropriate, since the user didn't specify the
number of cores to request. `*` is also fine since there's `local[*]` with the
same semantics (i.e. this app will grab all the cores available to it).
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