Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/731#issuecomment-49966556
I haven't looked at the code change, but it might not be a good idea to
remove support for multiple workers in a machine. When you have really large
memory machines it is sometimes better to run multiple JVMs with smaller heaps
rather than one big JVM. This is mostly to avoid GC pauses which grow with
larger heap sizes.
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