1. Hardware Resources

Ensure that you prepare the following hardware resources:

  • ResourceManager machines: The machines where you run Active and Standby ResourceManagers should have exactly the same hardware. For recommended hardware for ResourceManagers, see "Hardware for Master Nodes" in the Cluster Planning Guide.

  • Zookeeper machines: For automated failover functionality, there must be an existing Zookeeper cluster available. The Zookeeper service nodes can be co-located with other Hadoop daemons.