Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2030#issuecomment-52695504
[SPARK-3115](https://issues.apache.org/jira/browse/SPARK-3115) is an
umbrella issue to improve task broadcast latency for small tasks; Reynold has
created a bunch of subtasks to track future improvements, including the
multi-threading improvements.
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