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https://issues.apache.org/jira/browse/SPARK-21321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves resolved SPARK-21321.
-----------------------------------
       Resolution: Fixed
         Assignee: Jong Yoon Lee
    Fix Version/s: 2.3.0
                   2.2.1

> Spark very verbose on shutdown confusing users
> ----------------------------------------------
>
>                 Key: SPARK-21321
>                 URL: https://issues.apache.org/jira/browse/SPARK-21321
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.1.1
>            Reporter: Jong Yoon Lee
>            Assignee: Jong Yoon Lee
>            Priority: Minor
>             Fix For: 2.2.1, 2.3.0
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> On shutdown, spark can be very verbose and can spit out errors that causes 
> the user to be confused. 
> If possible, we should not print those out and just ignore them by changing 
> the changing the log level from WARNING to DEBUG.
> Also shutdown of spark can take a long time because of the backlog of events 
> in the event queue ( warnings like: Message $message dropped. 
> ${e.getMessage}).
> This happens more with dynamic allocation on.
> I am suggesting to 
> 1. change the log level when the shutdown is happening and the RPC 
> connections are closed(RpcEnvStoppedException).
> 2. Clear the event queue when RPC module is stopped and spark is shutting 
> down.



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