Resolution:
In the fault-tolerant configuration, some Brokers can be set up as Failover Brokers. When a Broker is designated a Failover Broker, no Director will route Engines to that Broker unless there are no other active Brokers. When there are no Jobs waiting for service on a Failover Broker and other Brokers on the Grid are available, the Failover Broker will "kick off" idle Engines causing the Engines to log in to their Primary Director and get reassigned to a non-Failover Broker in the cluster. By default, all Brokers are non-Failover Brokers (they load-balance work). Designate one or more Brokers within the cluster as Failover Brokers when you want those Brokers to remain idle during normal (non-failure) operation.

To set up a Failover Broker:

   1. Log in to the GridServer Administration Tool.
   2. Select the Manager Tab, then select Manager Configuration page.
   3. In the Miscellaneous section, go to Broker and set Failover Broker to True.
   4. Restart your Manager.

Setting Up a Failover Broker (GridServer 3.2)