Apache Ambari Operations
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Refreshing YARN Capacity Scheduler

This topic describes how to “refresh” the Capacity Scheduler from Ambari when you add or modify existing queues. After you modify the Capacity Scheduler configuration, YARN enables you to refresh the queues without restarting your ResourceManager, if you have made no destructive changes (such as completely removing a queue) to your configuration. The Refresh operation will fail with the following message: Failed to re-init queues if you attempt to refresh queues in a case where you performed a destructive change, such as removing a queue. In cases where you have made destructive changes, you must perform a ResourceManager restart for the capacity scheduler change to take effect.

To refresh the Capacity Scheduler, follow these steps:

  1. In Ambari Web, browse to Services > YARN > Summary.

  2. Click Service Actions, and then click Refresh YARN Capacity Scheduler.

  3. Confirm that you want to perform this operation.

The refresh operation is submitted to the YARN ResourceManager.

More Information

ResourceManager High Availability