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https://issues.apache.org/jira/browse/HDFS-11026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746047#comment-15746047
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Andrew Wang commented on HDFS-11026:
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bq. a 2.x client could work with protobuf tokens issued by a 3.x cluster, but
only if it was a recent 2.x release containing this improvement.
Sorry if this is a dumb question, but I thought tokens were opaque to clients.
Why do we need to upgrade the client to be aware of PB block tokens? To be
concrete, will a 2.6.0 client be able to talk to a 3.0 cluster issuing PB block
tokens?
> 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
> Fix For: 3.0.0-alpha2
>
> Attachments: HDFS-11026.002.patch, HDFS-11026.003.patch,
> blocktokenidentifier-protobuf.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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