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https://issues.apache.org/jira/browse/SPARK-25023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568767#comment-16568767
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Thomas Graves commented on SPARK-25023:
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I'm going to work on this

> Clarify Spark security documentation
> ------------------------------------
>
>                 Key: SPARK-25023
>                 URL: https://issues.apache.org/jira/browse/SPARK-25023
>             Project: Spark
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 2.2.2
>            Reporter: Thomas Graves
>            Priority: Major
>
> I was reading through our deployment docs and security docs and its not clear 
> at all what deployment modes support exactly what for security.  I think we 
> should clarify the deployments that security is off by default on all 
> deployments.  We may also want to clarify the types of communication used 
> that would need to be secured.  We may also want to clarify multi-tenant safe 
> vs other things, like standalone mode for instance in my opinion is just note 
> secure, we do talk about using spark.authenticate for a secret but all 
> applications would use the same secret.



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