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https://issues.apache.org/jira/browse/KNOX-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16686835#comment-16686835
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Kevin Risden commented on KNOX-1098:
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This might be possible to do with rewrite rules with some of the pieces like 
postfix.

https://cwiki.apache.org/confluence/display/KNOX/2017/08/14/Understanding+Rewrite+Rules+for+Apache+Knox

> Livy Service Json body proxyUser property should be added when not present.
> ---------------------------------------------------------------------------
>
>                 Key: KNOX-1098
>                 URL: https://issues.apache.org/jira/browse/KNOX-1098
>             Project: Apache Knox
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 0.14.0, 1.0.0, 1.1.0
>            Reporter: Jeffrey Rodriguez
>            Assignee: Jeffrey E  Rodriguez
>            Priority: Major
>              Labels: livy
>             Fix For: 1.3.0
>
>
> Current Knox Livy service will replace the value pair proxyUser, user to 
> impersonate when running the job , with the value of the user that Knox has 
> authenticated. If the proxyUser value pair doesn't exist the rewrite rule 
> will not add the proxyUser value pair.



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