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https://issues.apache.org/jira/browse/HDFS-1842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022370#comment-13022370
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Suresh Srinivas commented on HDFS-1842:
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OK I will go with (2) then.
> Cannot upgrade 0.20.203 to 0.21 with an editslog present
> --------------------------------------------------------
>
> Key: HDFS-1842
> URL: https://issues.apache.org/jira/browse/HDFS-1842
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: 0.20.203.0
> Reporter: Allen Wittenauer
> Priority: Blocker
> Attachments: HDFS-1842.rel203.patch, HDFS-1842.rel204.patch
>
>
> If a user installs 0.20.203 and then upgrades to 0.21 with an editslog
> present, 0.21 will corrupt the file system due to opcode re-usage.
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