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https://issues.apache.org/jira/browse/HIVE-12513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025736#comment-15025736
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Siddharth Seth commented on HIVE-12513:
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Writable just required bytes to be written and read back in. A protobuf
instance wrapped in a writable can be used (used in Hadoop to allow for changes
to the token across versions). Essentially, the serialized bytes end up being
interpreted as Protobuf - with support for unknown fields etc.
> Change LlapTokenIdentifier to use protobuf
> ------------------------------------------
>
> Key: HIVE-12513
> URL: https://issues.apache.org/jira/browse/HIVE-12513
> Project: Hive
> Issue Type: Improvement
> Components: llap, Security
> Reporter: Siddharth Seth
>
> Follow up to HIVE-12341. Currently writable, which can get in the way of
> upgrades.
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