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https://issues.apache.org/jira/browse/HDFS-1842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021679#comment-13021679
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Suresh Srinivas commented on HDFS-1842:
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Upgrade to 0.21 will not corrupt the file system! 21 will not load the editlog
and the upgrade fails.
> 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: Bug
> Components: name-node
> Affects Versions: 0.20.203.0
> Reporter: Allen Wittenauer
> Priority: Blocker
>
> 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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