The SnapLogic control plane and data plane handles certain overload conditions on a Snaplex that includes putting a Pipeline in a Queued state during Pipeline execution. When an execution is in the Queued state, the control plane will initiate the Pipeline execution when resources become available on the Snaplex. You can also configure an Alert/Activity Notification for Snaplexes to set resource thresholds that detect congestion.
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Pipeline executions can fail immediately if the Snaplex is overloaded; this condition triggers the alert notification if configured. Triggered Task executions retry for a minute before returning a failure to the requesting client.
Slot allocation is configured per Snaplex. See the Update Snaplex dialog for these options.