Restore running applications to pre-update state in Amazon Managed Service for Apache Flink

You can now restore your Amazon Managed Service for Apache Flink application to the previous running version and application state from the most recent, successful snapshot. This feature will work when your application is running and is most useful when you want to immediately rollback to the previous application version to mitigate downstream impact of an application update. Prior to this launch, you could only rollback applications that were in updating or autoscaling statuses. 

Source:: Amazon AWS