Handling Rollback issues with ZDU
This troubleshooting section addresses issues encountered during the rollback of a failed upgrade while performing Zero Downtime Upgrade (ZDU) involving file append and open file operations.
There are three cases identified when performing a rollback. Each case involves specific steps and circumstances that result in unexpected behavior related to block generation stamps (genstamps) in the NameNode. These cases provide root cause of these problems and solutions.