YARN service management via ADCM

Elena Kostyuchenko

The ADCM UI provides actions to manage the YARN service and its components. For information on how to run service actions, refer to ADH service actions.

The actions available for the YARN service are listed in the table below.

For more information about YARN components, see YARN architecture.

Action Description

Check

Runs service-specific tests to check the health of the service and its components

Start

Starts the service. When you run this action, the option Apply configs from ADCM is available. If it is set to true, all service configurations defined in ADCM settings will be applied on the service startup. Otherwise, the service starts without applying configurations from ADCM

Stop

Stops the service

Restart

Restarts the service. When you run this action, the option Apply configs from ADCM is available. If it is set to true, all service configurations defined in ADCM settings will be applied during the service restart. Otherwise, the service restarts without applying configurations from ADCM

Remove

Removes the service from the cluster. This action should be used to remove already installed services. Whereas the delete control can be used to remove a non-mapped service (a service which components have not been distributed among cluster hosts)

Add Client(s)

Adds YARN client(s) to the cluster. Running this action opens the component-host mapping interface where you can add new YARN clients

Remove Client(s)

Removes YARN client(s) from cluster hosts. Running this action opens the component-host mapping interface where you can remove YARN clients from specific hosts

Move MapReduce History Server

Moves the MapReduce History Server component to a different cluster host. Use the force option if the source host (where the component is currently installed) is offline

Move ResourceManagers Server

Moves the YARN ResourceManagers Server component to a different cluster host. Use the force option if the source host (where the component is currently installed) is offline

Move YARN Timeline Server

Moves the YARN Timeline Server component to a different cluster host. Use the force option if the source host (where the component is currently installed) is offline

Add NodeManagers

Adds YARN NodeManagers. Running this action opens the component-host mapping interface where you can add new NodeManagers

Decommiss NodeManagers

Shuts down a NodeManager. This action can be used to temporarily take a node out of service or safely delete it. When using this action, enter the FQDNs of the hosts to decommission and the time to start the decommission in seconds (Timeout). The decommission is immediate by default. To decommission a node gracefully, use the refreshNodes command with the -g option

Recommiss NodeManagers

Reinstates the decommissioned NodeManagers

Remove NodeManagers

Removes YARN NodeManagers. Running this action opens the component-host mapping interface where you can remove NodeManagers

Manage Ranger plugin

Enables or disables Ranger plugin for YARN

Add ResourceManager(s)

Adds YARN ResourceManager components. Running this action opens the component-host mapping interface where you can add new ResourceManager components. For more information on ResourceManager, see YARN high availability overview

Add/modify node labels

Adds or changes node labels. You can use node labels to create groups of hosts, for example, to designate nodes to specific tasks or to manage nodes' resources between queues. When using this action, enter labels to be used in a cluster and their exclusivity (True or False). The dafault exclusivity is True

Add/modify node-to-labels mapping

Maps the node labels added using the Add/modify node labels action to the hosts. When using this action, enter the hosts' FQDNs and the labels you want to assign to them

Reload Scheduler config

Reloads access control lists, states, and scheduler specific properties. Use this action to apply changes made to Capacity Scheduler’s configuration file. Fair Scheduler doesn’t require reloading after its configuration has been altered

Remove node label

Removes node labels from the cluster. When using this action, enter the list of labels you want to remove separated by commas

Remove ResourceManagers

Removes YARN ResourceManager components. Running this action opens the component-host mapping interface where you can remove ResourceManager components

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