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| Client vs. Server? |
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| pichelma |
 Posted: Thu Apr 18, 2002 8:34 am Post subject: |
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Apprentice
Joined: 11 Mar 2002
Posts: 25
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Hi all,
Hoping someone could verify my findings on Server vs. Client.
I am told that the MQ client does not guarantee "assured" delivery of msgs, is this "all-together" true? If a queue is defined as persistent, can this help?
Any attributes for a channel definition that may guarantee delivery as well?
Is this soley up to the developer when coding MQI calls from the app?(EX.java)
On the server-side, I know the q-mgr/queues cache/save the msg. in case of TCP/IP(network), Machine/memory crash's or q-mgr problems...and have tested this already.
Any suggestions or solutions?
TIA!
Scott
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| bower5932 |
| Posted: Thu Apr 18, 2002 9:11 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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I wouldn't say that an MQ client does NOT give assured message delivery. The MQSeries client makes a synchronous network connection to the qmgr. If this connection is up and running, all is well. If this connection goes down, your application will get an error at message put time (probably a 2009) and you'll need to save your message. When you run in server (or bindings) mode, the application makes a direct (inter-process) connection to the qmgr so you don't have the possbility of a message not making it to the qmgr because of the network.
There aren't any parameters that you need to set to get this behavior. Marking a queue (or message) as persistent doesn't have any effect on the network connection.
As far as server-to-server communication is concerned, the channels on both ends use internal counters (CURLUWID, CURMSGS, CURSEQNO, LSTSEQNO) to verify which messages they have sent/received so that a message isn't lost or duplicately delivered.
Any suggestions or solutions?
TIA!
Scott |
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| EddieA |
| Posted: Thu Apr 18, 2002 9:41 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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The 'window of doubt' on a Client is between the Get from the Queue until the application has processed the data.
You can protect this by doing the Get under Syncpoint.
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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| pichelma |
| Posted: Thu Apr 25, 2002 8:00 am Post subject: |
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Apprentice
Joined: 11 Mar 2002
Posts: 25
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Thanks again for clarifying guys!
Yes, more clear on this topic now.
I will utilize both suggestions...
thanks,
Scott |
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