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| What is BackoutRequeueQName?????? |
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| eswarnv |
 Posted: Sat Dec 21, 2002 2:06 am Post subject: What is BackoutRequeueQName?????? |
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Voyager
Joined: 20 Dec 2001
Posts: 88
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Hi
Can any body give Idea abt what is the significance of BackoutRequeueQName, BackoutThreshold and hardened back out attributes of a Queue??
I have gone thru Application Reference Guide, But I failed to understand.
Thanks in Advance
Eswar. |
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| bob_buxton |
| Posted: Sat Dec 21, 2002 2:07 pm Post subject: |
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Master
Joined: 23 Aug 2001
Posts: 266
Location: England
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If an application fails to process a message and backs out the message will be returned to the queue and the application will get it again.
If the original problem was a temporary failure it may be OK this time but if it fails again an endless loop may develop.
The backout count is the number of times the message has failed.
The backout threshold is an indication to the application how many times it should attempt to retry processing the message before writing it to the requeue queue.
Note it is up to the application to move the message (if it wants to) the queue manager does not check the threshold.
To maintain the backout count across a queue manager restart requires extra work and IO so impacts performance and therefore is optional.
_________________
Bob Buxton
Ex-Websphere MQ Development |
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| eswarnv |
| Posted: Sat Dec 21, 2002 7:53 pm Post subject: |
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Voyager
Joined: 20 Dec 2001
Posts: 88
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| bower5932 |
| Posted: Mon Dec 23, 2002 9:23 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| kingdon |
| Posted: Mon Dec 23, 2002 11:59 pm Post subject: |
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Acolyte
Joined: 14 Jan 2002
Posts: 63
Location: UK
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There's also an MQJMS specific slant. The JMS layer will attempt to use the backout queue name and backout threshold settings to redirect messages that cause multiple failures when using asynchronous message delivery, i.e. if the onMessage method terminates by throwing a RuntimeException. However, throwing RuntimeExceptions from onMessage is discouraged, and relying on this MQ specific behaviour will reduce portability.
Regards,
James. |
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