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https://issues.apache.org/jira/browse/HDFS-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910172#comment-13910172
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Fengdong Yu commented on HDFS-6003:
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[~vinayrpet], can you also take a look HDFS-5778, which is rolling upgrade
document, I do think you'd better update HDFS-5578.
> 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
>
> Add '-rollingUpgrade <rollback|downgrade>' to namenode usage message
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