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https://issues.apache.org/jira/browse/HDFS-14753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16919452#comment-16919452
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Fei Hui commented on HDFS-14753:
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[~aajisaka] Thanks for filing this issue. It makes sense.
Where should we document?
> Document HDFS-8432 (Introduce a minimum compatible layout version to allow
> downgrade in more rolling upgrade use cases)
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14753
> URL: https://issues.apache.org/jira/browse/HDFS-14753
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: documentation, rolling upgrades
> Reporter: Akira Ajisaka
> Priority: Major
>
> After HDFS-8432, we can downgrade to the different layout version if the
> layout version of the destination is equal to or greater than the minimum
> compatible layout version of the source. This information is very important
> for administrators and it needs to be documented.
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