Ozone Manager

Ozone Manager (OM) decommissioning is the process in which you gracefully remove one of the OM from the OM HA Ring.

To decommission an OM and remove the node from the OM HA ring, the following steps need to be executed.

1. Add the OM NodeId of the OM Node to be decommissioned to the ozone.om.decommissioned.nodes.<omServiceId> property in ozone-site.xml of all other OMs.
2. Run the following command to decommission an OM node.

ozone admin om decommission -id=<om-service-id> -nodeid=<decommissioning-om-node-id> -hostname=<decommissioning-om-node-address> [optional --force]

The force option will skip checking whether OM configurations in ozone-site.xml have been updated with the decommissioned node added to ozone.om.decommissioned.nodes property.

Note - It is recommended to bootstrap another OM node before decommissioning one to maintain HA.