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| Error handling question |
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| kwelch |
 Posted: Tue Aug 13, 2002 10:06 am Post subject: Error handling question |
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Master
Joined: 16 May 2001
Posts: 255
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Hi,
I have a scenario I would like to run by this forum to see how they would handle this situation.
We have a messageflow where on the input node we define the Domain as MRM, format as CWF, MessageSet and type are set correctly. This goes to a compute node which attempts to process the message and convert it to xml and then goes to the output node. Simple enough. So now we are trying to incorporate error handling. If for some reason the message is bad, we want to, change the expiry to unlimited and persistence of the original message and have it go to the Fail Queue. Then we want to send a reply back to the sender saying 'your message made it to the WMQI flow but it could not be processed'. Today they just get a 2033 time out and don't know where the problem occurs.
We thought we had this set up and created a subflow to do this, but when we put a bad message it just sits on the Input Queue and nothing happens.
How would some of you approach this? Thanks for any tips!
Karen |
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| kirani |
| Posted: Tue Aug 13, 2002 10:15 am Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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need more information ..
1. Do you have any backout queue defined for the input queue?
2. What is your Backout Threshold set to?
3. Do you have MQInput's catch and failure terminal connected?
4. Where is your sub-flow connected/listening to?
5. Do you have DLQ defined for the queue manager?
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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| kwelch |
| Posted: Tue Aug 13, 2002 10:56 am Post subject: |
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Master
Joined: 16 May 2001
Posts: 255
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Hi Kiran,
In answer to your questions:
1. no backout queue
2. Backout threshold = 0
3/4. The input's Fail was wired to the error subflow - sorry forgot to mention that!!! the Catch was wired to a throw node
5. Yes we do have a DLQ
When I unwire the Fail and Catch the message does go to the DLQ.
Karen |
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| kirani |
| Posted: Tue Aug 13, 2002 11:31 am Post subject: |
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Jedi Knight
Joined: 05 Sep 2001
Posts: 3779
Location: Torrance, CA, USA
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Karen,
If there is a parsing error at MQInput node itself, your message will be propagated to the failure terminal of the MQInput node. Could you explain your error sub-flow here? If there is an error in error sub-flow itself, your message will roll-back to the MQInput node and it will keep on looping in the failure path.
You could add a try-catch node in the beginning of your error sub-flow and add a Trace node to the Catch terminal of TryCatch node. In the Trace node, print ExceptionList. This way you will know why is your error-subflow failing and message is looping.
Make sure you don't print ${Root} in any of the trace node in your failure sub-flow. This will force the parser to parse input message and it will fail (throw Exception) for bad input message.
_________________
Kiran
IBM Cert. Solution Designer & System Administrator - WBIMB V5
IBM Cert. Solutions Expert - WMQI
IBM Cert. Specialist - WMQI, MQSeries
IBM Cert. Developer - MQSeries
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| kwelch |
| Posted: Tue Aug 13, 2002 11:49 am Post subject: |
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Master
Joined: 16 May 2001
Posts: 255
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Hi Kiran,
The error subflow is set up in the following manner:
InputTerminal ---> Compute Node(change expiry and persistence) ---> MQOutputNode(FailQ)
| ---> Compute Node(Set Pass CorrelID) ---> Compute Node(Format reply message) ---> MQOutputNode(ReplytoQ)
There is definitely an error on the input node because when I wire the fail node to just a queue it ends up there, otherwise the DLQ. So it would seem that the subflow does have a problem and we are in that looping state you mentioned. The subflow has promoted items and I wonder if we are not putting them in correctly. You have given me some good sugestions of things to try and I will do that. Thanks!
Karen |
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