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https://issues.apache.org/jira/browse/SPARK-17649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15526426#comment-15526426
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Dhruve Ashar commented on SPARK-17649:
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[~zsxwing] Since we are logging the drop event count, it would be beneficial to 
provide some stats into how many were dropped of a specific type. 

>From what I have seen is majority of the dropped events are Executor Metrics 
>update. It would make the log message a bit longer, but the information will 
>be helpful. We could add it as a debug as well. Let me know your thoughts.  

> Log how many Spark events got dropped in LiveListenerBus
> --------------------------------------------------------
>
>                 Key: SPARK-17649
>                 URL: https://issues.apache.org/jira/browse/SPARK-17649
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>            Priority: Minor
>             Fix For: 1.6.3, 2.0.2, 2.1.0
>
>
> Log how many Spark events got dropped in LiveListenerBus so that the user can 
> get insights on how to set a correct event queue size.



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