Ewan Higgs created HDFS-11026:

             Summary: 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: 3.0.0-alpha1, 2.9.0
            Reporter: Ewan Higgs

{{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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