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https://issues.apache.org/jira/browse/HDFS-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910183#comment-13910183
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Vinayakumar B commented on HDFS-6003:
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Hi [~azuryy], I checked HDFS-5778, its not including this change.
> Add '-rollingUpgrade <rollback|downgrade>' to namenode usage message
> --------------------------------------------------------------------
>
> Key: HDFS-6003
> URL: https://issues.apache.org/jira/browse/HDFS-6003
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Priority: Minor
> Attachments: HDFS-6003.patch
>
>
> Add '-rollingUpgrade <rollback|downgrade>' to namenode usage message
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