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Message
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| Gert |
 Posted: Wed Jun 13, 2007 5:16 am Post subject: Messages are lost |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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Hey,
I have the following situation:
- When I Stop my QM or the sender channel and I send in a message with BizTalk, this message stays on the queue or in BizTalk. When the I start everything back, the message is retried or send to AS400 correctly.
- I unplug my network cable and send in a message via BizTalk and MQSeries. The status of the sender channel is still running but after a few minutes it goed in the retry mode. When I then plugin my network cable again, the sender channel goes back in the Runnig modus but my message is lost!!! I do not know where the message is. It is not in biztalk because everything is on the same machine. Only the network connection to AS400 is lost.
How can I get my message are see where it is??? |
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| DTran |
| Posted: Wed Jun 13, 2007 7:19 am Post subject: |
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Acolyte
Joined: 11 May 2006
Posts: 62
Location: Amsterdam
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Hi Gert,
is the message persisitent? if not, did your application puts an expiry on the message?
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| tleichen |
| Posted: Wed Jun 13, 2007 7:26 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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Are you sending from a client or server? Also, have you checked the dead letter queue? 
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IBM Certified MQSeries Specialist
IBM Certified MQSeries Developer |
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| Gert |
| Posted: Wed Jun 13, 2007 9:50 pm Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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| DTran wrote: |
Hi Gert,
is the message persisitent? if not, did your application puts an expiry on the message? |
The message is Not Persistent.
How can I check the expiry? |
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| Gert |
| Posted: Wed Jun 13, 2007 9:51 pm Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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| tleichen wrote: |
| Are you sending from a client or server? Also, have you checked the dead letter queue? |
I am sending from a server.
I defined a dead letter queue but nothing is on if I am checking correct.
Can you give me the excact steps to check this? |
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| Nigelg |
| Posted: Wed Jun 13, 2007 10:21 pm Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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| Quote: |
| The message is Not Persistent |
It is normal for a non-persistent msg to be lost if a channel fails. Set the channel attribute NPMSPEED to NORMAL.
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| Gert |
| Posted: Wed Jun 13, 2007 11:22 pm Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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| Nigelg wrote: |
| Quote: |
| The message is Not Persistent |
It is normal for a non-persistent msg to be lost if a channel fails. Set the channel attribute NPMSPEED to NORMAL. |
Do I have to set it also to Persistent?
I thought that MQSeries was guaranteed delivery? How can I make it guaranteed? |
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| marcin.kasinski |
| Posted: Wed Jun 13, 2007 11:30 pm Post subject: |
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Sentinel
Joined: 21 Dec 2004
Posts: 850
Location: Poland / Warsaw
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| Gert wrote: |
| Nigelg wrote: |
| Quote: |
| The message is Not Persistent |
It is normal for a non-persistent msg to be lost if a channel fails. Set the channel attribute NPMSPEED to NORMAL. |
Do I have to set it also to Persistent?
I thought that MQSeries was guaranteed delivery? How can I make it guaranteed? |
Sometimes you need persistent messages , sometimes not.
It depends on design ?
If you need persistent messages just set this message attribute to 1 ?
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Marcin |
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| Gert |
| Posted: Wed Jun 13, 2007 11:33 pm Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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| marcin.kasinski wrote: |
| Gert wrote: |
| Nigelg wrote: |
| Quote: |
| The message is Not Persistent |
It is normal for a non-persistent msg to be lost if a channel fails. Set the channel attribute NPMSPEED to NORMAL. |
Do I have to set it also to Persistent?
I thought that MQSeries was guaranteed delivery? How can I make it guaranteed? |
Sometimes you need persistent messages , sometimes not.
It depends on design ?
If you need persistent messages just set this message attribute to 1 ? |
What is the actual difference between persistent and non-persistent?
This is not clear to me.
In the HELP file is written that persistent message survive network and communication failures. |
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| marcin.kasinski |
| Posted: Wed Jun 13, 2007 11:39 pm Post subject: |
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Sentinel
Joined: 21 Dec 2004
Posts: 850
Location: Poland / Warsaw
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| Gert wrote: |
What is the actual difference between persistent and non-persistent?
This is not clear to me.
In the HELP file is written that persistent message survive network and communication failures. |
It is true.
Persistent message survive network and communication failures because they are stored on filesystem.
Non-persistent message won't survive network and communication failures because they are kept in memory.
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Marcin
Last edited by marcin.kasinski on Thu Jun 14, 2007 12:02 am; edited 1 time in total |
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| Gert |
| Posted: Wed Jun 13, 2007 11:47 pm Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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| marcin.kasinski wrote: |
| Gert wrote: |
What is the actual difference between persistent and non-persistent?
This is not clear to me.
In the HELP file is written that persistent message survive network and communication failures. |
An it is true ?
Persistent message survive network and communication failures because they are stored on filesystem.
Non-persistent message won't survive network and communication failures because they are kept in memory. |
So persistent is just slower because of the filesystem. We have a lot of small messages so this would not be a problem.
When a message is send ok, it will be deleted from the filesystem?
Where can I find these saved messages? |
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| marcin.kasinski |
| Posted: Wed Jun 13, 2007 11:57 pm Post subject: |
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Sentinel
Joined: 21 Dec 2004
Posts: 850
Location: Poland / Warsaw
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| Gert wrote: |
So persistent is just slower because of the filesystem.
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Yes
| Gert wrote: |
When a message is send ok, it will be deleted from the filesystem?
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Yes
| Gert wrote: |
Where can I find these saved messages? |
Why do you need this information ?
For you the most important is information if message survive failure and QMGR restart.
Both types of messages you cat get and pu twit hthe same API.
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Marcin |
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| Vitor |
| Posted: Thu Jun 14, 2007 12:41 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Gert wrote: |
Where can I find these saved messages? |
In the queue manager's log, in a propietory IBM format which is undocumented and likely to change without warning between versions if IBM decide they need to change it.
Don't go looking. Queue managers (especially Windows ones) can get cross if they find there's another file handle open on their logs while they're running..... 
(Don't ask how I know that!)
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Honesty is the best policy.
Insanity is the best defence. |
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| Gert |
| Posted: Thu Jun 14, 2007 1:26 am Post subject: |
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Newbie
Joined: 13 Jun 2007
Posts: 9
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I did a test with persistent messages and this works ok even with unpluging the network cable and pluging it back in.
Thanks... |
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| Nigelg |
| Posted: Thu Jun 14, 2007 12:56 pm Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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Why did you not do as I suggested?
Setting the NPMSPEED attribute to NORMAL causes non-persistent msgs to act like persistent msgs as far as channels are concerned, i.e. the msgs are read from the xmitq in syncpoint, and rolled back to the xmitq in the event of a channel failure.
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