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| Duplicate Message problem in AIX HACMP environment |
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| kkbhatt |
 Posted: Wed Oct 20, 2004 8:35 pm Post subject: Duplicate Message problem in AIX HACMP environment |
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Newbie
Joined: 18 Jul 2004
Posts: 6
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Hi ,
My client has following environments
Mainframe (HOST) running MQ 2.1.1, TCP 150C and VSE/ESA 2.5 (VSE)
AIX5.2L running MQ5.3 CSD07 in HACMP environment . The environment is active-passive mode.
Win2K client , which run trigger monitor and grab messages from queue of AIX
HOST is sending 1000 messages to AIX using BATCHSZ=50 (default). While the message are processing (say 500) , we force fully failover the MQ on AIX from active node to passive one.
Once passive node becomes active , the channel could not start on VSE , we found that there are extra 50 messages on VSE side and sequence number mismatch. We have to "reset channel" to make the system work. Eventually when the channel was reset , there were 50 extra messages.
It looks to me that syscpoint problem on VSE side.
Any help would be appreciated as customer find this as serious problem.
Regards
Kamal |
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| EddieA |
| Posted: Thu Oct 21, 2004 8:50 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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Did the channel go "In-Doubt". Did you have to "resolve" the channel. If so, did you you follow the instructions in the InterCommunication Guide.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| newtown |
| Posted: Sun Oct 31, 2004 7:07 pm Post subject: |
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Novice
Joined: 03 Feb 2003
Posts: 16
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Hi There
I am not really good on mainframe side.But from WMQ point of view
If a channel dropped mid transmission and MQ is unable to resolve the status of a current unit of work automatically, the channel will not restart. To restart it the administrator must manually commit or rollback the current unit of work (synchpoint). In these cases it is possible messages will be lost, or occur multiple times respectively.
I would suggest using the support-pac to montior the health of channels |
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| kkbhatt |
| Posted: Sun Oct 31, 2004 7:28 pm Post subject: |
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Newbie
Joined: 18 Jul 2004
Posts: 6
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Hi,
Thanks everyone for the reply. The problem was related to "in-doubt" channel. Unfortunately on VSE side there is no command to COMMIT/ROLLBACK. We have to manually delete the messages that are already commited .
Regards
Kamal |
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| csmith28 |
| Posted: Sun Oct 31, 2004 7:49 pm Post subject: |
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Grand Master
Joined: 15 Jul 2003
Posts: 1196
Location: Arizona
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VSE, well that explains it.
_________________
Yes, I am an agent of Satan but my duties are largely ceremonial. |
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