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| zhaider |
 Posted: Wed Oct 14, 2015 4:28 am Post subject: Queues not retaining messages after failover |
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Apprentice
Joined: 08 Oct 2015
Posts: 40
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I have configured a two node MSCS cluster. The problem I'm facing is that after putting any message in the Local queue when I failover to the other node I found the same queue to be empty. If I failover to the original node again, the queue is still empty.
The messages put inside the queue gets deleted once I switch over to the other node. Please help me.
And if possible can someone also tell me the solution to the problem I'm facing here: http://www.mqseries.net/phpBB2/viewtopic.php?p=398790
I found a work around by setting a 1 minute timer but still I'll be grateful for the permanent solution.
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| Vitor |
| Posted: Wed Oct 14, 2015 4:56 am Post subject: Re: Queues not retaining messages after failover |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| zhaider wrote: |
| The messages put inside the queue gets deleted once I switch over to the other node. Please help me. |
What makes you think they should still be there? If the messages are not persistent, functioning as designed.
(I offer the traditional warning about claiming the messages are persistent because the default persistence of the queue is "YES". Fire and pain result).
Apparently not, or they'd have posted it to that thread..... 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| Vitor |
| Posted: Wed Oct 14, 2015 4:57 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Moved to "General IBM MQ Support" as this isn't the kind of clustering that section is dedicated to....
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| zhaider |
| Posted: Wed Oct 14, 2015 9:32 am Post subject: Re: Queues not retaining messages after failover |
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Apprentice
Joined: 08 Oct 2015
Posts: 40
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| Vitor wrote: |
| zhaider wrote: |
| The messages put inside the queue gets deleted once I switch over to the other node. Please help me. |
What makes you think they should still be there? If the messages are not persistent, functioning as designed.
(I offer the traditional warning about claiming the messages are persistent because the default persistence of the queue is "YES". Fire and pain result).
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Okay thanks! Can you clarify it further? What does I need to do to make it persistent unless they are consumed by some services. I basically wants to keep maintain the state of the queue at the time of failover.
Sorry, I'm new to this stuff. |
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| Vitor |
| Posted: Wed Oct 14, 2015 9:54 am Post subject: Re: Queues not retaining messages after failover |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| zhaider wrote: |
| What does I need to do to make it persistent unless they are consumed by some services. |
Make sure that the application that puts the message on the queue sets the message to be persistent. This is either done by the application explicitly setting the message persistence, or by the application taking the queue default and the default being set to persistent.
(It's a common misconception that the queue setting controls the persistence, when in fact the application controls it and the queue only offers a suggestion.)
If you ask 3 MQ experts which of the two methods is best, you'll get 5 different answers. Neither method is "wrong", nor is either method "better", and I'll probably get flamed in a moment.....
| zhaider wrote: |
| I basically wants to keep maintain the state of the queue at the time of failover. |
Be sure that's what you want. Aside from deciding how to set message persistence, deciding when to set message persistence is another thorny question. It's perfectly possible that the messages in a queue are redundant post-failover. Consider this slightly contrived example:
An application is happily sending messages and getting responses from another application, both connected to this queue manager you have under MSCS. There's a system level issue (for Windows, something like the server's been running for 2 days without being restarted) and the queue manager crashes. The applications get a face full of 2009 errors and rollback, reconnect and otherwise recover. When the queue manager restarts, it will take time performing a forward recovery on the queue to retrieve the messages which may be responses the enquiring application has already given up on, and then has to spend time reading and ignoring.
| zhaider wrote: |
| Sorry, I'm new to this stuff. |
Welcome to the world. Enjoy reading the InfoCenter, and get yourself on some training courses.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Wed Oct 14, 2015 11:19 am Post subject: Re: Queues not retaining messages after failover |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| Vitor wrote: |
| ... and I'll probably get flamed in a moment..... |
No flaming from here.
| Vitor wrote: |
| Be sure that's what you want. |
The business requirement will determine whether messages should be persistent or non-persistent. As Vitor suggests, there are consequences for either/both.
| Vitor wrote: |
| Welcome to the world. Enjoy reading the InfoCenter, and get yourself on some training courses. |
Get some training.
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| zhaider |
| Posted: Thu Oct 15, 2015 3:43 am Post subject: |
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Apprentice
Joined: 08 Oct 2015
Posts: 40
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| Thanks guys for the help. Since I'm just starting up, I just try to learn on my own. Paid training right now is not an option, I'm afraid. |
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| bruce2359 |
| Posted: Thu Oct 15, 2015 5:14 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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