Default operational database cluster definition
When you create an operational database cluster, you can use the Operational Database template and the default cluster definition. The cluster can be scaled up or down later, but the underlying cluster definition is unchanged to support the master services and the minimum required configuration. The cluster definition primarily defines cloud provider settings.
If you are using Amazon AWS as your public cloud provider, your HBase cluster has the following cluster definition:
One gateway node that hosts the Knox gateway and Cloudera Manager, and a ZooKeeper Server.
One node running the HDFS NameNode, and a ZooKeeper Server.
One node running the HBase Master, and a ZooKeeper Server.
At least three worker nodes. Each worker node has a RegionServer and a DataNode.