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https://issues.apache.org/jira/browse/HDFS-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13549737#comment-13549737
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Suresh Srinivas commented on HDFS-4367:
---------------------------------------

Aaron, in the wire protocol response a field is becoming from required to 
optional. That is an incompatible change. It probably does not affect the 
correctly configured DFSClient users. However for folks who are directly 
planning to use protobuf or using protobuf, this is a change. I will add to the 
release note, this will not affect the DFSClient users.
                
> GetDataEncryptionKeyResponseProto  does not handle null response
> ----------------------------------------------------------------
>
>                 Key: HDFS-4367
>                 URL: https://issues.apache.org/jira/browse/HDFS-4367
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>            Priority: Blocker
>         Attachments: HDFS-4367.patch
>
>
> GetDataEncryptionKeyResponseProto member dataEncryptionKey should be optional 
> to handle null response.

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