Zero Configuration Failover for the ResourceManager

As of MapR 4.0.2, you can use zero configuration failover. With zero configuration failover, the ResourceManager role is installed on two or more nodes but the ResourceManager process only runs on one node in the cluster.

If the node running the ResourceManager process fails and the Warden on that node is unable to restart it, the Warden on each node and Zookeeper work together to start a ResourceManager process on the cluster. ResourceManager clients connect to the Zookeeper to determine which ResourceManager node is active. Therefore, when failover occurs, the Resource Manager clients are not affected as they automatically connect to the active ResourceManager.

Note: When you run maprcli service list command, the state of the active ResourceManager process displays as 2 (running) but the other ResourceManagers displays as 5 (stand by).