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https://issues.apache.org/jira/browse/HADOOP-13123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278623#comment-15278623
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Ravi Prakash commented on HADOOP-13123:
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I'm a +1 on reverting the change in branch-2 since it breaks rolling upgrades
(and we can't do that in minor version upgrades). Could someone else please
also +1 this proposal and I'll be happy to revert.
> Permit the default hadoop delegation token file format to be configurable
> -------------------------------------------------------------------------
>
> Key: HADOOP-13123
> URL: https://issues.apache.org/jira/browse/HADOOP-13123
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Matthew Paduano
> Assignee: Matthew Paduano
>
> If one environment updates to using the new dtutil code and accompanying
> Credentials code, there is a backward compatibility issue with the default
> file format being JAVA. Older clients need to be updated to ask for a file
> in the legacy format (FORMAT_JAVA).
> As an aid to users in this trap, we can add a configuration property to set
> the default file format. When set to FORMAT_JAVA, the new server code will
> serve up legacy files without being asked. The default value for this
> property will remain FORMAT_PB. But affected users can add this config
> option to the services using the newer code.
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