About Alarms Related to Back-Off Policy

There are two domain event alarm types related to retry and back off. They are EnforcerNodeBackoff and EnforcerNodeBackoffMaxRetried.

As of NuoDB 2.2, these alarms are predefined for any domain. If you have done a rolling upgrade to NuoDB 2.2, you will have to explicitly define these alarms. See Defining Alarms.

The EnforcerNodeBackoff alarm will trigger when enforcement notes that a process has shut down, but based on its back-off settings, does not restart the process. This alarm reports the uptime of the process, which will be less than backoff.reqMinUptime, the time that enforcement will retry the policy again (nextEnforcerTime), and the backoff (retry/fail) count.