A layout version management based framework for supporting non rolling upgrades in Ozone.
https://issues.apache.org/jira/secure/attachment/13023446/Ozone%20Non-Rolling%20Upgrades%20Doc%20v1.2%20%28Implemented%20Design%29.pdf
https://issues.apache.org/jira/secure/attachment/13005731/Ozone%20Non-Rolling%20Upgrades%20%28Presentation%29.pdf