About Suspending and Resuming Document Retrieval for All Triggers
When you suspend document retrieval for all the webMethods messaging triggers on an Integration Server, the Integration Server stops retrieving documents from the Broker and Universal Messaging. Integration Server resources, such as threads and memory, that would have been used for document retrieval are available for other tasks.
Suspending document retrieval for all webMethods messaging triggers is a quick way to free up server resources. This can be especially helpful in a situation in which the Integration Server is functioning under heavy load and additional resources are needed immediately.
Suspending or resuming document retrieval can be a temporary or permanent change. (Integration Server considers a document retrieval change to be permanent if you selected the Apply Change Permanently check box when you made the change.) If the change is temporary, Integration Server reverts to the permanent document retrieval state when Integration Server restarts or you reload a package. When you reload a package, Integration Server reverts only the webMethods messaging triggers contained in that package to the permanent document retrieval state. For example, suppose that you temporarily suspend document retrieval for all webMethods messaging triggers. If you reload the package OrderProcessing, Integration Server resumes document retrieval for the webMethods messaging triggers in the OrderProcessing package only.
Tip:
On the Messaging > webMethods triggers page, under Document Retrieval, Integration Server Administrator indicates a temporary document retrieval change by displaying an asterisk (*) next to the trigger status in the Active column.
You can gradually resume document retrieval by setting the Queue Capacity Throttle to a low percentage, such as 10%, and then resuming document retrieval for all webMethods messaging triggers. Integration Server resumes document retrieval at the adjusted capacity for all webMethods messaging triggers. You can also gradually resume document retrieval by selectively resuming individual triggers. For example, you might want to first resume document retrieval for those triggers that are part of a critical or high priority process.
Before suspending or resuming document retrieval, keep the following information in mind:
Suspending document retrieval affects document retrieval from the messaging provider only (
Broker and
Universal Messaging).
webMethods messaging triggers will continue to receive locally published documents. Additionally,
webMethods messaging triggers will continue to receive documents delivered to the default client.
When you suspend document retrieval, documents to which a
webMethods messaging trigger subscribes will collect on the messaging provider. Documents remain on the messaging provider until document retrieval resumes for the trigger or the documents expire.
Specifically, one of the following happens:
For a
webMethods messaging trigger that receives documents from the
Broker,
Integration Server stops polling for documents.
For a
webMethods messaging trigger that receives documents from
Universal Messaging,
Integration Server pauses the subscription.
Note:
Prior to Integration Server version 10.7, suspending a trigger that received messages from Universal Messaging resulted in Integration Server stopping and closing the subscription. Integration Server rolled back all of the documents that had been retrieved but not acknowledged to Universal Messaging, including unprocessed documents in the trigger queue and documents currently being processed. This led to duplicates. Pausing the subscription will not cause any documents to be rolled back, thus introducing duplicates. Any messages already received by the trigger will be processed as long as the trigger is enabled and processing is not suspended.
If you suspend document retrieval for a
webMethods messaging trigger, but do not suspend document processing for the trigger, the trigger continues processing the documents it has already retrieved. This includes acknowledging the documents to the messaging provider.
When you resume document retrieval,
Integration Server resumes document retrieval for
webMethods messaging triggers at the percentage specified by the
Queue Capacity Throttle.
If you do not resume document retrieval before
Integration Server restarts, the trigger package reloads, or the trigger properties are modified, the messaging provider discards any volatile documents that it is holding for the trigger.