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| Messages get lost if CHANNEL Speed is FAST and DEFPSIST(NO) |
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| skoesters |
 Posted: Mon Aug 25, 2008 5:16 am Post subject: Messages get lost if CHANNEL Speed is FAST and DEFPSIST(NO) |
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Acolyte
Joined: 08 Jun 2008
Posts: 73
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Hi,
i have a very simple configuration.
2 QMGR with 1 Local Queue, 1 transmission queue,1 local definition of remote queue and 1 Sender / Receiver Channel each.
i send a message from server 1 to server 2 via amqsput
Server 1:
start amqsput, send message, stop amqsput
Server 2:
start amqsget, receive message, stop amqsget.
i am able to receive the first message. After that i do the same again (server 1 start amqsput, send message, stop amqsput - server 2 start amqsget, receive message, stop amqsget). Then there is no message on Server 2.
If i wait 1-2 Minutes and do the same again i receive the first message and again not the second message (if i start amqsget, stop amqsget and start it again to receive the second message).
if i start amqsput, send a message, stop amqsput on Server 1 while amqsget is running on server 2 i am able to get every message.
If i now set Channel Speed from FAST to NORMAL none of the messages gets lost and i can stop and start amqsget as often as i want. I am able to see every message i send with amqsput. Also if i leave Channel Speed on FAST and set DEFPSIST = YES i am able to get every message.
There is nothing running in the background that could erase the message bevor i can receive it with amqsget. That i cant receive some messages only happens when the Channel is set to FAST and DEFPSIST(NO).
CHANNEL = FAST and DEFPSIST(YES): no Problem
CHANNEL = NORMAL and DEFPSIST(NO): no Problem
CHANNEL = NORMAL and DEFPSIST(YES): no Problem
CHANNEL = FAST and DEFPSIST(NO): Problem
I dont know why.
My Network is a switched 100Mbit Network with no erros on it and i use MQ7 on Linux.
regards
Sebastian |
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| fjb_saper |
| Posted: Mon Aug 25, 2008 10:42 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| skoesters wrote: |
| CHANNEL = FAST and DEFPSIST(NO): Problem |
You should not treat this case as a problem but as a feature.
Basically MQ tells you that if you want extra fast messages and no persistence, you do not care whether the message gets lost because you have other means of knowing whether the transaction completed or because you do not care....
What can cause a hickup and lost message in this case? Any hickup in communications i.e. in the channel. The message is not persisted and if it cannot be delivered it will be lost. This is what you instruced MQ to do.
Working as designed 
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MQ & Broker admin |
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| skoesters |
| Posted: Mon Aug 25, 2008 11:11 am Post subject: |
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Acolyte
Joined: 08 Jun 2008
Posts: 73
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| PeterPotkay |
| Posted: Mon Aug 25, 2008 11:11 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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If the channel burped and tossed the message, I would think the QM error logs on either side would show a channel error. Not an error message saying the MQ message was tossed, but a message saying the channel dropped and reconnected.
_________________
Peter Potkay
Keep Calm and MQ On |
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