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https://issues.apache.org/jira/browse/HDFS-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218791#comment-13218791
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Konstantin Shvachko commented on HDFS-3028:
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Based on the exception message "Reported: -40. Expecting = -39" it seems that
for rolling back you use the same version you upgraded with. You need to run
-rollback with the old version - the one with LV -39. Is that the problem?
> DFS rollback broken
> -------------------
>
> Key: HDFS-3028
> URL: https://issues.apache.org/jira/browse/HDFS-3028
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.24.0
> Reporter: Todd Lipcon
>
> I ran an upgrade to test a patch which updates the data format, but when I
> then tried to rollback, the DNs don't seem to respond properly.
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