Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/110#issuecomment-37154887
I find that new users often wonder why Spark is only using 1 core, and it's
because they expected local to use all their cores rather than defaulting to
just one. Changing the default to use all the cores available on the machine
when MASTER=local makes sense to me.
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