Doesn't this say something about the physical path: For remote queuing, the configuration is such that there can only be one path from the application making the put request, through its queue manager, through intercommunication, to the destination queue manager and the target queue.
>From: Rick Tsujimoto <[EMAIL PROTECTED]> >Reply-To: MQSeries List <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: Re: retrieve order >Date: Thu, 19 Sep 2002 09:59:29 -0400 > >Dave, > >If what you say is true, then IBM has to update its claim about sequential >retrieval. No where in that claims does it make exceptions due to the >physical network. I would have thought that TCP/IP would reassemble the >packets in their proper order regardless how they traversed the network. >But, may IBM can clarify that. > >Here's the IBM claim: > >2.1.14.1 | Sequential retrieval of messages > > | If an application puts a sequence of messages to the same destination >| >queue, those messages can be retrieved in sequence by a single application >| with a sequence of MQGET operations, if the following conditions are met: >All of the put requests were done from the same application. >All of the put requests were either from the same unit of work, or all the >put requests were made outside of a unit of work. >The messages all have the same priority. >The messages all have the same persistence. >For remote queuing, the configuration is such that there can only be one >path from the application making the put request, through its queue >manager, through intercommunication, to the destination queue manager and >the target queue. >The messages are not put to a dead-letter queue (for example, if a queue is >temporarily full). >The application getting the message does not deliberately change the order >of retrieval, for example by specifying a particular MsgId or CorrelId or >by using message priorities. >Only one application is doing get operations to retrieve the messages from >the destination queue. If this is not the case, these applications must be >designed to get all the messages in each sequence put by a sending >application. >Note: Messages from other tasks and units of work may be interspersed with >the sequence, even where the sequence was put from within a single unit of >work. If these conditions cannot be met, and the order of messages on the >target queue is important, then the application can be coded to use its own >message sequence number as part of the message to assure the order of the >messages. > > > > > Thomas Dunlap > <tsdunlap@WORLDN To: >[EMAIL PROTECTED] > ET.ATT.NET> cc: > Sent by: Subject: Re: retrieve order > MQSeries List > <MQSERIES@AKH-Wi > en.AC.AT> > > > 09/19/2002 09:02 > AM > Please respond > to MQSeries List > > > > > >Dave, > >This is an indication that you are sending across a "dynamically routed" >network, like the Internet. >Since congestion may cause the messages to take different path through the >network, they may >arrive in the receiving system in a different order. > >This is the purpose of Messages Groups in WebSphere MQ (MQSeries) to >resolve. Unfortunately >this support was not introduced into WebSphere MQ for z/OS V5.3. Unless >you are at the latest >and greatest WebSphere MQ has to offer your choices are limited. You can >devise a way to handle it yourself or send a single message. > >I can not imagine why you receive duplicate data, unless it is sent twice >or possibly MS MSMQ may be utilized as the sender. Sometimes I have seen >MSMQ resend data. > >Dave Adam wrote: > > we have a system that sent a message > > header > data > data > trailer > > and came into the mainframe program as > > header > data > trailer > data > > is this a common thing, > > or should the receiving program be intelligent enough to figure out > what should have been > > oh, by the way, some times they say they get duplicate info > > Dave Adam > Supervalu Home Office > Project Specialist > (952) 828-4736 > [EMAIL PROTECTED] > > Success is a Journey, not a Destination > >-- >Regards, >Thomas Dunlap Chief Technology Officer [EMAIL PROTECTED] >Themis, Inc. http://www.themisinc.com 1 (800) 756-3000 > >Instructions for managing your mailing list subscription are provided in >the Listserv General Users Guide available at http://www.lsoft.com >Archive: http://vm.akh-wien.ac.at/MQSeries.archive _________________________________________________________________ Join the world s largest e-mail service with MSN Hotmail. http://www.hotmail.com Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
