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| Questions on WMQ Client in WAN environment |
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| dwbchen |
 Posted: Fri Jun 27, 2008 4:15 am Post subject: Questions on WMQ Client in WAN environment |
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Newbie
Joined: 27 Jun 2008
Posts: 3
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Hi,
I am a newbie to WMQ technology but has to investigate a solution for a client utilizing WMQ in a WAN environment. I have read up on some documentation but am still unclear about a number of aspects on using MQ client in WAN environment.
1. On the client machine with only MQ client installed, when the end user application calls mqput() to add a message to queue on a remote queue manager over WAN, half way through the transmission the link drops off, does this raise an exception to the mqput() call?
2. Now, am I right in saying the end user application will then have to manage the re-sending, as technically, the message in not yet in the queue?
(Sorry if I have already answered my own questions)
3. If this presumption is correct, what would be the advantages then of using MQ client over WAN (apart from it is free), as it would seem in this case MQ can not be utilized to overcome network unreliability issues?
Thanks in Advance for the assistance! |
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| gbaddeley |
| Posted: Fri Jun 27, 2008 5:09 am Post subject: Re: Questions on WMQ Client in WAN environment |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| dwbchen wrote: |
Hi,
I am a newbie to WMQ technology but has to investigate a solution for a client utilizing WMQ in a WAN environment. I have read up on some documentation but am still unclear about a number of aspects on using MQ client in WAN environment.
1. On the client machine with only MQ client installed, when the end user application calls mqput() to add a message to queue on a remote queue manager over WAN, half way through the transmission the link drops off, does this raise an exception to the mqput() call? |
Yes, most likely a Reason Code of 2009 (MQRC_CONNECTION_BROKEN.
| Quote: |
| 2. Now, am I right in saying the end user application will then have to manage the re-sending, as technically, the message in not yet in the queue? |
Yes, including reconnecting to the queue manager and opening the queue.
| Quote: |
(Sorry if I have already answered my own questions)
3. If this presumption is correct, what would be the advantages then of using MQ client over WAN (apart from it is free), as it would seem in this case MQ can not be utilized to overcome network unreliability issues?
Thanks in Advance for the assistance! |
The main advantage is a light software footprint and minimal MQ configuration on the client machine.
Many critical applications use MQ client (with persistent messages & syncpoint). As long as the network is reliable, its not normally an issue. If the connection fails mid-stream, generally the client app transaction will back itself out, present an error to the user, and they just simply try again.
_________________
Glenn |
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| PeterPotkay |
| Posted: Fri Jun 27, 2008 1:15 pm Post subject: Re: Questions on WMQ Client in WAN environment |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| gbaddeley wrote: |
| dwbchen wrote: |
Hi,
I am a newbie to WMQ technology but has to investigate a solution for a client utilizing WMQ in a WAN environment. I have read up on some documentation but am still unclear about a number of aspects on using MQ client in WAN environment.
1. On the client machine with only MQ client installed, when the end user application calls mqput() to add a message to queue on a remote queue manager over WAN, half way through the transmission the link drops off, does this raise an exception to the mqput() call? |
Yes, most likely a Reason Code of 2009 (MQRC_CONNECTION_BROKEN.
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And then you guess if the message made it to the queue or not. You don't know if the connection broke before the message made it to the queue or did it break after the put happened but before the results of that put made it back.
_________________
Peter Potkay
Keep Calm and MQ On |
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