aajisaka opened a new pull request #2309:
URL: https://github.com/apache/hadoop/pull/2309


   JIRA: https://issues.apache.org/jira/browse/HDFS-15580
   
   In Java 12 or upper, we cannot use reflection to update a final variable.
   
   - Make DataNode layout version non-final
   - Create getter and setter for the layout version
   - The getter is annotated by `@VisibleForTesting`


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