Apache Ambari Views
Also available as:
PDF
loading table of contents...

Configuring Cluster Scheduler Settings

You can use the Scheduler box to set global capacity scheduler settings that apply to all queues.

The following Scheduler global parameters are available:

  • Maximum Applications -- To avoid system-thrash due to an unmanageable load -- caused either by malicious users, or accidentally -- the Capacity Scheduler enables you to place a static, configurable limit on the total number of concurrently active (both running and pending) applications at any one time. This property is used to set this limit, with a default value of 10,000.

  • Maximum AM Resource -- The limit for running applications in any specific queue is a fraction of this total limit, proportional to its capacity. This is a hard limit, which means that once this limit is reached for a queue, any new applications submitted to that queue will be rejected, and clients will have to wait and retry later.

  • Node Locality Delay -- The number of missed scheduling cycles after which the scheduler attempts to schedule rack-local containers.

  • Calculator -- The method by which the scheduler calculates resource capacity across resource types.