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MQSeries.net Forum IndexMultiphase Commitclient and ccdt and ...

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mqjeff
PostPosted: Wed Jan 02, 2013 7:36 am Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17447

You can see the problem in general if the TM is connected to one queue manager, and the app is connected to a different queue manager, right?

Regardless of reconnection, the use of qmgr groups means that every connection attempt can be made to different queue managers.

This problem is less important in cases where you are using the QM itself as the TM - in that it doesn't have to necessarily connect to itself.

But with WAS, it is WAS that acts as the TM and not the qmgr.

This is also less important with databases, because databases that have multiple physical locations tend to behave much more like multi-instance qmgrs rather than a CCDT qmgr group - in that it's "the same" object at multiple locations rather than different objects at multiple locations.

Although things like Oracle clusters make this a bit more complicated as well - but the Oracle client tends to handle this in ways that the MQ client does not. The MQ client uses the CCDT only for name resolution and doesn't really implement HA functions or clustering functions. It's a 'thinner' client that way.
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jcv
PostPosted: Thu Jan 03, 2013 12:40 am Post subject: Reply with quote

Chevalier

Joined: 07 May 2007
Posts: 409
Location: Zagreb

I was under the impression that TM and app don't have to connect separately to RM (QM) in order to perform an XA transaction. They can pass a connection handle to each other, do they not?
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jcv
PostPosted: Wed Jan 09, 2013 12:53 am Post subject: Reply with quote

Chevalier

Joined: 07 May 2007
Posts: 409
Location: Zagreb

This conversation looks dead, and since no definitive answer is reached, let's conclude it with:

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=29911

Thanks to all participants in this thread.
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fjb_saper
PostPosted: Wed Jan 09, 2013 2:40 am Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20091
Location: LI,NY

jcv wrote:
This conversation looks dead, and since no definitive answer is reached, let's conclude it with:

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=29911

Thanks to all participants in this thread.


Don't know if this RFE is as feasible as you think. You seem to be forgetting that the TM does need to connect to the RM (qmgr) in order to resolve in flight transactions that had not been resolved when WAS shutdown...
(Part of WAS startup sequence).

Have fun
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jcv
PostPosted: Wed Jan 09, 2013 6:20 am Post subject: Reply with quote

Chevalier

Joined: 07 May 2007
Posts: 409
Location: Zagreb

I couldn't forget something I never knew, ie all the things TM is supposed to do. I don't have the slightest clue if it's feasible (I guess someone will tell me, or will not) but that what you mention looks feasible. The only thing that has to be developed in ETC is a method to check all possible qmgrs (as defined by ccdt) for a given transaction id.
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jcv
PostPosted: Thu Jan 10, 2013 6:14 am Post subject: Reply with quote

Chevalier

Joined: 07 May 2007
Posts: 409
Location: Zagreb

... although, to store somewhere information about specific qmgr involved in transaction would be much more natural than checking more than is needed. May I ask you fjb_saper why do you think RFE is not feasible?
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bruce2359
PostPosted: Thu Jan 10, 2013 7:10 am Post subject: Reply with quote

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Joined: 05 Jan 2008
Posts: 8461
Location: US: west coast, almost. Otherwise, enroute.

A good read, which includes application issues, auto-reconnect, and more: http://publib.boulder.ibm.com/infocenter/wmqv7/v7r0/index.jsp?topic=%2Fcom.ibm.mq.csqzaf.doc%2Fcs10270_.htm
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