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https://issues.apache.org/jira/browse/HDFS-6605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046386#comment-14046386
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Andrew Wang commented on HDFS-6605:
-----------------------------------

There was some discussion on HDFS-6391 with [~michaelbyoder] about this, I 
think I'll try the approach outlined there: the client presents the cipher 
suites it wants to use in priority order and the server chooses. This should 
also let us later evolve the protocol if desired.

> Client server negotiation of cipher suite
> -----------------------------------------
>
>                 Key: HDFS-6605
>                 URL: https://issues.apache.org/jira/browse/HDFS-6605
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: security
>    Affects Versions: fs-encryption (HADOOP-10150 and HDFS-6134)
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>
> For compatibility purposes, the client and server should negotiate what 
> cipher suite to use based on their respective capabilities. This is also a 
> way for the server to reject old clients that do not support encryption.



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