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https://issues.apache.org/jira/browse/HDFS-14753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16919640#comment-16919640
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Akira Ajisaka commented on HDFS-14753:
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The document is here:
[https://hadoop.apache.org/docs/r3.2.0/hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html]
Source code:
[https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsRollingUpgrade.md]
> 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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