functions-host-json-service-bus.md

author	ms.service	ms.topic	ms.date	ms.author
ggailey777	azure-functions	include	09/04/2018	glenga

{
    "serviceBus": {
      "maxConcurrentCalls": 16,
      "prefetchCount": 100,
      "autoRenewTimeout": "00:05:00"
    }
}

Property	Default	Description
maxConcurrentCalls	16	The maximum number of concurrent calls to the callback that the message pump should initiate. By default, the Functions runtime processes multiple messages concurrently. To direct the runtime to process only a single queue or topic message at a time, set maxConcurrentCalls to 1.
prefetchCount	n/a	The default PrefetchCount that will be used by the underlying MessageReceiver.
autoRenewTimeout	00:05:00	The maximum duration within which the message lock will be renewed automatically.