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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