Akira Ajisaka created HDFS-14753:
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             Summary: 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: hdfs, rolling upgrades
            Reporter: Akira Ajisaka


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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