Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1257#issuecomment-47434691
I commented on the JIRA, but I don't think this should be configurable. If
someone overflows this buffer it means there program is not in steady state
(the buffer is already really large at 10,000 events). We should instead
improve the efficiency of the listeners so that programs cannot get into this
state.
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