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https://issues.apache.org/jira/browse/HDFS-3028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218795#comment-13218795
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Todd Lipcon commented on HDFS-3028:
-----------------------------------
I don't think so - I ran the rollback with the old version (-39). Maybe the
issue is that it's reporting the version number from the storage instead of the
_current_ version number from LayoutVersion?
In order to unblock my (unrelated) testing I used some sed scripts to change
the version number back to -39 and started the DNs (which supports the theory
that the DNs are indeed running -39).
> 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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