[SPARK-18838][CORE] Use separate executor service for each event listener#16291

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sitalkedia wants to merge 2 commits intoapache:masterfrom sitalkedia:skedia/event_log_processing

+341-268

Commits on Dec 28, 2016

[SPARK-18838] Use a separate executor service for each event listener
Sital Kedia
committed
Support event listener group
Sital Kedia
committed