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https://issues.apache.org/jira/browse/HDFS-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13875276#comment-13875276
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Jing Zhao commented on HDFS-5786:
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+1 Patch looks good to me.
> Support query and finalize rolling upgrade
> ------------------------------------------
>
> Key: HDFS-5786
> URL: https://issues.apache.org/jira/browse/HDFS-5786
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h5786_20140117.patch
>
>
> This is Namenode side implementation for supporting QUERY and FINALIZE
> actions of rolling upgrade.
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