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https://issues.apache.org/jira/browse/SPARK-20472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984461#comment-15984461
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Sean Owen commented on SPARK-20472:
-----------------------------------

I don't think this is generally possible, because some config is global, it is 
needed and has effect at startup, and can't be changed even if you wanted 
(think: JVM heap size). I doubt this is achievable. You will probably have to 
narrow this down much further. 

> Support for Dynamic Configuration
> ---------------------------------
>
>                 Key: SPARK-20472
>                 URL: https://issues.apache.org/jira/browse/SPARK-20472
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Submit
>    Affects Versions: 2.1.0
>            Reporter: Shahbaz Hussain
>
> Currently Spark Configuration can not be dynamically changed.
> It requires Spark Job be killed and started again for a new configuration to 
> take in to effect.
> This bug is to enhance Spark ,such that configuration changes can be 
> dynamically changed without requiring a application restart.
> Ex: If Batch Interval in a Streaming Job is 20 seconds ,and if user wants to 
> reduce it to 5 seconds,currently it requires a re-submit of the job.



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