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MQSeries.net Forum IndexGeneral IBM MQ SupportTemporary reply queue combined with Remote qmgr

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garasan
PostPosted: Thu May 24, 2018 3:51 am Post subject: Temporary reply queue combined with Remote qmgr Reply with quote

Apprentice

Joined: 22 Jul 2008
Posts: 42
Location: Antwerp, Belgium

Hi,

a little call for help since I'm out off idea's

Situation:
2 qmgrs, I will call them A & B, with working sender en receiver channels in between (2 ways). This has been tested and verified.
Note: The TRANSQ names match the receiving QMGR name on the other end, and this on both sides.

App A is running on WAS6.5
App B is running on WAS8.5.5

QMGR A version is v8
QMGR B version is V7.1

App A sends a message to a remote queue on qmgr A. This with the creation of a local temporary reply queue on qmgr A. (Verified and the queue is there at the time of the sending off the message)
This remote queue points to a local queue on qmgr B.
The message does arrive on the local queue in qmgr B and is picked up by App B, who replies.

And this is where the problem lies. The reply message ends up on the SDLQ

Looking at the message on the SDLQ, it has no DLQ header.
But the ReplyToQMgr is correct and matching the name of the existing Transmit queue.
The ReplyToQ is also correct and matching the created temporary reply queue name...
The Temp Reply queue disapears after 30s and at the same time App A fails with 'Timeout while waiting for message on reply queue'

The while process should take at most 5s. (Shouldn't even be 1s, but I'm taking a marging)

Permissions should all be good.

Any hint is welcome...
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garasan
PostPosted: Thu May 24, 2018 4:05 am Post subject: Reply with quote

Apprentice

Joined: 22 Jul 2008
Posts: 42
Location: Antwerp, Belgium

The Way I get is this: (Simplified so I'm as clear as possible)

1. App A sends message to remote queue with added request to open a TempRQ to Qmgr A.

2. Qmgr A sends the message to Qmgr B since sent to a RQueue and Creates a TEMPRQ

3. Message arives on qmgr B.

4. App B reads the message with the reply info from the initial message.

5. App B processes the message and sends a reply to the TransQ from Qmgr A with info from step 4 to qmgr B.

6. Qmgr B is not able to find the TempRQ on Qmgr A and fails..


I'm basing this on below article..
https://www.ibm.com/support/knowledgecenter/SSFKSJ_7.5.0/com.ibm.mq.con.doc/q015410_.htm

Since all queue's in step 6 are present, I'm starting to doubt step 5.
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exerk
PostPosted: Thu May 24, 2018 4:38 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5921

Check that App B is committing the message before the Temp Dyn queue time-out set.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys.

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garasan
PostPosted: Thu May 24, 2018 4:41 am Post subject: Reply with quote

Apprentice

Joined: 22 Jul 2008
Posts: 42
Location: Antwerp, Belgium

OK, thanks for the tip..

Going to verify that...
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gbaddeley
PostPosted: Thu May 24, 2018 4:37 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1872
Location: Melbourne, Australia

Quote:
Looking at the message on the SDLQ, it has no DLQ header.

That seems a bit unusual. Are there any message delivery errors on both qmgr's error logs?
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PeterPotkay
PostPosted: Thu May 24, 2018 5:16 pm Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7459

My guess is the message on the DLQ is not the reply, but the request.

The app on B picks up the request, fails, tries to back it out to a backout queue, can't so puts it to the DLQ. That explains why no DLH, and why the messages has a Reply To Q and the Reply to QM for A. Note that if this was the reply message produced on B, the reply to QM would be B, and the Reply To Q would be blank.
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Peter Potkay
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garasan
PostPosted: Fri May 25, 2018 1:00 am Post subject: Reply with quote

Apprentice

Joined: 22 Jul 2008
Posts: 42
Location: Antwerp, Belgium

Hi All,

after more investigation I had to conclude it was related to an application (B) problem, rather than an MQ problem...
The Train of my thoughts was indeed correct. (Damn, that feels good :-))

I came to that conclusion because of below 3 reasons:

1. The message at the SDLQ was missing a DLQ header, wat made me assume it was not MQ putting it there, since MQ would add a DLQ Header. So it's almost sure it is done by the application itself. (Idealy it would add a DLQ header too, but that is a different discussion.

2. I tripple checked everything on the MQ level and wasn't able to find anything wrong.
No errors in the error log , all permissions where there, etc....

3. The application (B) log showed an error at the time of reply.. Offcourse the DEV's took the quick road and initialy blamed it on MQ.

Thanks for all the tips on this.. It did help to confirm my train of thoughts and build up a solid cause to defer the problem from the MQ level to an application level.
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