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https://issues.apache.org/jira/browse/HDFS-14831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16925291#comment-16925291
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Wei-Chiu Chuang commented on HDFS-14831:
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The same fix is in branch-2.7 (not in the last release 2.7.7). Had 2.7 had
another release (2.7.8), it would be possible to resolve this problem by
downgrading to 2.7.8. But 2.7 is voted End of Life by the community so I doubt
this could happen.
Similarly, downgrade could fail from 3.2.0 to 2.8.0 ~ 2.8.4, or from 3.2.0 to
2.9.0 ~ 2.9.1, in which case, a user should downgrade to 2.8.5 and 2.9.2
respectively (both releases have the fsimage corruption fix). I would suggest
to update the Upgrade/Downgrade user doc, offer a recommended downgrade path,
instead of fixing it.
> Downgrade Failed from 3.2.0 to 2.7 because of incompatible stringtable
> -----------------------------------------------------------------------
>
> Key: HDFS-14831
> URL: https://issues.apache.org/jira/browse/HDFS-14831
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.2.0, 3.3.0, 3.1.3
> Reporter: Fei Hui
> Assignee: Fei Hui
> Priority: Major
>
> Mentioned on HDFS-13596
> Incompatible StringTable changes cause downgrade from 3.2.0 to 2.7.2 failed
> commit message as follow, but issue not found
> {quote}
> commit 8a41edb089fbdedc5e7d9a2aeec63d126afea49f
> Author: Vinayakumar B <vinayakum...@apache.org>
> Date: Mon Oct 15 15:48:26 2018 +0530
> Fix potential FSImage corruption. Contributed by Daryn Sharp.
> {quote}
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