Github user concretevitamin commented on the pull request:
https://github.com/apache/spark/pull/1579#issuecomment-50183155
Unfortunately I may not be able to find time to run an experiment soon. If
anyone is interested, I think `org.apache.spark.util.SizeEstimator` is
reasonable to try. Let's also see if
[SPARK-2316](https://issues.apache.org/jira/browse/SPARK-2316) gets fixed in
the near future, which may remove the need to increase the queue capacity.
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