This is documentation for MapR Version 5.0. You can also refer to MapR documentation for the latest release.

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Roles must be installed on nodes in a cluster before their corresponding services can be launched. For information on how to install roles on nodes, see Adding Roles to a Node.

Once a role is installed on a node and the warden has been restarted, MapR recognizes the role for that node and you can start the service. See Starting, Stopping, and Restarting Services for more information.

Adding Services

Services determine which roles a node fulfills. You can view a list of the roles configured for a given node by listing the /opt/mapr/roles directory on the node. To add roles to a node, you must install the corresponding services. See Adding Roles to a Node for more information.

Viewing Services on the Cluster

You can view services on the cluster using the dashboard info command, or using the MapR Control System. In the MapR Control System, the running services on the cluster are displayed in the Services pane of the Dashboard.

To view the running services on the cluster using the MapR Control System:

  1. Log on to the MapR Control System.
  2. In the Navigation pane, expand the Cluster Views pane and click Dashboard.

Viewing Services on a Node

You can view services on a single node using the service list command, or using the MapR Control System. In the MapR Control System, the running services on a node are displayed in the Node Properties View.

To view the running services on a node using the MapR Control System:

  1. Log on to the MapR Control System.
  2. In the Navigation pane, expand the Cluster Views pane and click Nodes.
  3. Click the hostname of the node you would like to view. The services are displayed in the Manage Node Services pane.

Reloading the Warden

Warden manages most other services on your cluster. Stopping and restarting Warden, either with service mapr-warden stop followed by service mapr-warden start or with the service mapr-warden restart command, also shuts down and starts up all the services that Warden manages. For situations where you want to reload the Warden service without affecting any other running services on your cluster, use the service mapr-warden reload command.

 

 

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