Microsoft KB Archive/331076

= FIX: XLANG Scheduler and the Message Queueing Service Consume 100 Percent of the System CPU =

Article ID: 331076

Article Last Modified on 10/6/2005

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APPLIES TO


 * Microsoft BizTalk Server 2002 Standard Edition

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This article was previously published under Q331076



SYMPTOMS
When correlation and dehydration occur in a schedule instance, XLANG Scheduler and the Message Queueing service (Mqsvc.exe) consume 100 percent of the system CPU. Also, schedule instances that may stay in the queue for a long time even if the correlation ID arrives (that is, the dehydrated schedule instances are not rehydrated at the correct time).



CAUSE
When a message arrives, a dehydrated schedule instance takes the message from the queue. If the message is not destined for that specific schedule instance, the instance closes the queue and reopens the queue as long as the message is in the queue. This behavior causes the instance to loop indefinitely because the message notification is enabled for the same message.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft BizTalk Server 2002. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

815781 How to Obtain the Latest BizTalk Server 2002 Service Pack

Hotfix Information
A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article. Only apply it to systems that are experiencing this specific problem. This fix may receive additional testing to further ensure product quality. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Service Pack 1 that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date        Time   Version     Size       File name --- 07-Nov-2002 17:47  3.0.1550.0  3,195,152  Skedcore.dll Note: Both the service pack and the hotfix installer will automatically reset the XLANG Schedule Pool COM+ component settings to these default values:
 * The Account identity is set to Interactive User - The current logged on user.
 * Object Pooling Size is set to 1 (the minimum value) and 25 (the maximum value).

If you customized these settings prior to installing the hotfix or service pack, you will need to change them back after installation.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft BizTalk Server 2002 Service Pack 1.

Additional query words: Orchestration Dehydration Rehydration

Keywords: kbbug kbfix kbbiztalk2002sp1fix KB331076

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