Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/7657#issuecomment-124815875
The thing I'm not 100% clear on is whether `spark.executor.instances` is
always set if you set `--num-executors`. It may be my unfamiliarity with this
part. I see parts where both are checked as a source of this setting but want
to make sure that assumption is correct, that you'll end up with this as a
`SparkContext` value (not just sys property) when you set `--num-executors`.
The test doesn't test that.
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