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https://issues.apache.org/jira/browse/HDFS-6215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13964321#comment-13964321
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Jonathan Eagles commented on HDFS-6215:
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+1. Thanks, Kihwal. It is indeed an annoyance. Committing to trunk, branch-2
and branch-2.4.
> Wrong error message for upgrade
> -------------------------------
>
> Key: HDFS-6215
> URL: https://issues.apache.org/jira/browse/HDFS-6215
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Minor
> Attachments: HDFS-6215.patch
>
>
> UPGRADE is printed instead of -upgrade.
> {panel}
> File system image contains an old layout version -51.
> An upgrade to version -56 is required.
> Please restart NameNode with the "-rollingUpgrade started" option if a rolling
> upgraded is already started; or restart NameNode with the "UPGRADE" to start
> a new upgrade.
> {panel}
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