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https://issues.apache.org/jira/browse/HDFS-11026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856808#comment-15856808
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Daryn Sharp commented on HDFS-11026:
------------------------------------

Taking a look today.  sorry for the wait.

> Convert BlockTokenIdentifier to use Protobuf
> --------------------------------------------
>
>                 Key: HDFS-11026
>                 URL: https://issues.apache.org/jira/browse/HDFS-11026
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: hdfs, hdfs-client
>    Affects Versions: 2.9.0, 3.0.0-alpha1
>            Reporter: Ewan Higgs
>            Assignee: Ewan Higgs
>             Fix For: 3.0.0-alpha3
>
>         Attachments: blocktokenidentifier-protobuf.patch, 
> HDFS-11026.002.patch, HDFS-11026.003.patch, HDFS-11026.004.patch, 
> HDFS-11026.005.patch
>
>
> {{BlockTokenIdentifier}} currently uses a {{DataInput}}/{{DataOutput}} 
> (basically a {{byte[]}}) and manual serialization to get data into and out of 
> the encrypted buffer (in {{BlockKeyProto}}). Other TokenIdentifiers (e.g. 
> {{ContainerTokenIdentifier}}, {{AMRMTokenIdentifier}}) use Protobuf. The 
> {{BlockTokenIdenfitier}} should use Protobuf as well so it can be expanded 
> more easily and will be consistent with the rest of the system.
> NB: Release of this will require a version update since 2.8.x won't be able 
> to decipher {{BlockKeyProto.keyBytes}} from 2.8.y.



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