Adding a Role Instance
Minimum Required Role: Limited Cluster Administrator (also provided by Full Administrator and Cluster Administrator)
After creating services, you can add role instances to the services. For example, after initial installation in which you created the HDFS service, you can add a DataNode role instance to a host where one was not previously running. Upon upgrading a cluster to a new version of Cloudera Runtime you might want to create a role instance for a role added in the new version.
dfs_hosts_allow.txt
file. The new role instance is configured with the
default role group for its role type, even if there are multiple role groups for the role
type. If you want to use a different role group, follow the instructions in the topic
Managing Role Groups for moving role instances to a different role
group