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The lazy start controller
The lazy start controller monitors the workload for dynamic clusters that you explicitly mark for deactivation. This controller triggers the placement controller to run off cycle and activate an inactive dynamic cluster when workload is detected. The lazy start controller also informs the placement controller when it is appropriate to deactivate these clusters.
The lazy start controller maintains the following information for
each dynamic cluster that can be deactivated:
- Deactivation timeout
- Specifies the minimum idle time before the deactivation of a dynamic cluster, which can be deactivated. Deactivation stops all instances of a dynamic cluster. The lazy start controller deactivates a cluster only if it perceives a condition of memory contention on the node that is running an idle application server.
- Time of last activity
- Specifies the time at which the cluster was last active. The lazy start controller compares the time of last activity to the current time to determine how long the cluster has been inactive. This value is then compared to the deactivation timeout value to determine if the dynamic cluster should be deactivated if another dynamic cluster needs resources.
- State
- Specifies if the dynamic cluster is in Active, Inactive, and Unknown state. A dynamic cluster state is initially Unknown. If queue activity or active instances are detected, then the state is changed to Active. If the cluster is idle for a sufficient time, according to the deactivation timeout property, the state is switched to Inactive.