Microsoft KB Archive/312684

= BUG: Suspended Schedule Instance Prevents Other Schedule Instances from Receiving Messages from the Same Message Queue =

Article ID: 312684

Article Last Modified on 6/4/2003

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APPLIES TO


 * Microsoft BizTalk Server 2000 Standard Edition
 * Microsoft BizTalk Server 2002 Standard Edition

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This article was previously published under Q312684



SYMPTOMS
If an XLANG schedule instance is suspended while it is waiting to receive a document from a Microsoft Message Queuing (MSMQ) message queue, it may block other running schedule instances from receiving messages from the same message queue. The XLANG Monitor shows all schedule instances that are receiving from the same message queue waiting at the &quot;MSMQ sink&quot; event.



CAUSE
The XLANG engine blocks any thread that is delivering a message to a suspended schedule. The MSMQ listener has one thread per message queue. While the thread is trying to deliver the message to the suspended queue, all other schedule instances listening on the same message queue wait.



RESOLUTION
To work around this problem, do not suspend a schedule instance that is waiting for a message from a given MSMQ message queue if there are or will be multiple schedule instances receiving messages from the message queue.



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

Keywords: kbbug kbnofix KB312684

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