Enabling asynchronous scheduler

Asynchronous scheduler decouples the CapacityScheduler scheduling from Node Heartbeats. This improves the latency significantly.

To enables asynchronous scheduling (yarn.scheduler.capacity.schedule-asynchronously.enable), perform the following:

  1. In Cloudera Manager, select Clusters > YARN Queue Manager UI service. A graphical queue hierarchy is displayed in the Overview tab.
  2. Click the Configuration tab.
  3. Select the Enable Asynchronous Scheduler check-box.
  4. Click Save.