Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/3141#issuecomment-62087166
Why is this change needed? IF you run the example through bin/run-example,
it should the SparkConf should be automatically populated with a master of
"local[*]", which sets the number of working threads as the number of cores in
the local system. And highly likely that your system has more than 1 cores. Is
there are situation where this is not working?
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