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https://issues.apache.org/jira/browse/HADOOP-10791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062277#comment-14062277
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Owen O'Malley commented on HADOOP-10791:
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With random, how do you synchronize between different servers and machines?

> AuthenticationFilter should support externalizing the secret for signing and 
> provide rotation support
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10791
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10791
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.4.1
>            Reporter: Alejandro Abdelnur
>            Assignee: Robert Kanter
>
> It should be possible to externalize the secret used to sign the hadoop-auth 
> cookies.
> In the case of WebHDFS the shared secret used by NN and DNs could be used. In 
> the case of Oozie HA, the secret could be stored in Oozie HA control data in 
> ZooKeeper.
> In addition, it is desirable for the secret to change periodically, this 
> means that the AuthenticationService should remember a previous secret for 
> the max duration of hadoop-auth cookie.



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