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https://issues.apache.org/jira/browse/SPARK-8344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600337#comment-14600337
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Apache Spark commented on SPARK-8344:
-------------------------------------

User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/7002

> Add internal metrics / logging for DAGScheduler to detect long pauses / 
> blocking
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-8344
>                 URL: https://issues.apache.org/jira/browse/SPARK-8344
>             Project: Spark
>          Issue Type: New Feature
>          Components: Scheduler, Spark Core
>            Reporter: Josh Rosen
>
> It would be useful to be able to log warnings if the DAGScheduler event 
> processing loop blocks for more than a certain amount of time (or if its 
> message inbox grows too large).  This debugging logging (probably disabled by 
> default) would be very helpful for finding places where the scheduling loop 
> blocks / slows down.
> We might be able to infer this information now from the web UI scheduler 
> delays, but that's kind of hard to parse out of logs or use to raise 
> monitoring alerts.



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