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https://issues.apache.org/jira/browse/HIVE-12513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025716#comment-15025716
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Sergey Shelukhin commented on HIVE-12513:
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Token is part of Hadoop security and is Writable. What we have is token
identifier; that also has to be writable so that Hadoop security could write
it, for all the basic parts of TokenIdentifier we inherit from delegation token
indentifier.. We can use protobuf for our stuff and just write bytes into
writable (currently we add nothing to the basic token though), but basic token
and superclass identifier have to stay writable.
> Change LlapTokenIdentifier to use protbuf
> -----------------------------------------
>
> Key: HIVE-12513
> URL: https://issues.apache.org/jira/browse/HIVE-12513
> Project: Hive
> Issue Type: Improvement
> Components: llap
> Reporter: Siddharth Seth
>
> Follow up to HIVE-12341. Currently writable, which can get in the way of
> upgrades.
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