Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/126#issuecomment-39529917
One high level comment - would it make sense to add a configuration flag
for whether GC is done at all. For now we could not document it (and by default
would be set to "true"). But since this is a fairly large internal change, it
would give us a way to let users disable it if we find issues in the 1.0
release. There is a large class of users who probably don't care about GC for
their jobs at all...
Something like `spark.garbageCollect` (okay that's a bad name, but
something like this).
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