Clearing Non-associated Queues of a Tenant

Scenario

If Yarn uses the Capacity scheduler, deleting a tenant only sets the queue capacity of the tenant to 0 and the tenant status to STOPPED but does not clear the queues of the tenant in Yarn. Limited by the Yarn mechanism, queues cannot be dynamically deleted. You can run commands to manually delete residual queues.

Impact on the System

• During the script execution, the Controller service is restarted, Yarn configurations are synchronized, and the active and standby ResourceManagers are restarted.
• FusionInsight Manager becomes inaccessible during the restart of the Controller service.
• After the active and standby ResourceManagers are restarted, an alarm is generated indicating that Yarn and components that depend on Yarn are temporarily unavailable.

Prerequisites

Queues of a deleted tenant still exist.

Procedure

1. Check that queues of the deleted tenant still exist.
   1. On FusionInsight Manager, choose Cluster, click the name of the target cluster, and choose Services > Yarn. Click the link of the active ResourceManager in ResourceManager WebUI to go to the ResourceManager web UI.
   2. Click Scheduler in the navigation tree on the left. In the right pane, you can view that queues of the tenant still exist in the STOPPED state and their Configured Capacity is 0.

2. Log in to the active management node as user omm.
3. Switch the directory and execute the cleanQueuesAndRestartRM.sh script.

   cd ${BIGDATA_HOME}/om-server/om/sbin

   ./cleanQueuesAndRestartRM.sh -c Cluster ID

   

   You can choose Cluster, click the cluster name, and choose Cluster Properties on FusionInsight Manager to view the cluster ID.

   During the script execution, you need to enter yes and the password.

   Running the script will restart Controller and restart ResourceManager.
   Are you sure you want to continue connecting (yes/no)?yes
   Please input admin password:
   Begin to backup queues ...
   ...

4. After the script is executed successfully, log in to FusionInsight Manager, choose Cluster, click the cluster name, and choose Services > Yarn. Click the link of the active ResourceManager in ResourceManager WebUI to go to the ResourceManager web UI.
5. Click Scheduler in the navigation tree on the left. In the right pane, you can view that queues of the tenant have been cleared.