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| what happens to message if that queue mgr goes down |
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| pras |
 Posted: Fri Jun 12, 2009 3:23 am Post subject: what happens to message if that queue mgr goes down |
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Newbie
Joined: 08 Jun 2009
Posts: 9
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Hi,
I am new to cluster concept.
I have a scenario where 2 Qmgrs are in cluster.
One clustered queue has been created in both the Qmgrs.
This queue has 1000 messages in both the queue managers.
Also, assuming both queue managers are being connected by application reading from its queue.
I ahve 2 queries:
1.If one queue manager starts to shutdown, will it stay in queising state till all messages are processed?
2. Is it possible that messages from queue mgr gouing down will be transferred to another queue manager? |
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| Vitor |
| Posted: Fri Jun 12, 2009 3:32 am Post subject: Re: what happens to message if that queue mgr goes down |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| pras wrote: |
| 1.If one queue manager starts to shutdown, will it stay in queising state till all messages are processed? |
Clustering does not affect queue manager behaviour. If the queue manager is signalled to controlled shutdown, all well behaved application will disconnect and the queue manager will close, leaving messages on the queue unprocessed (subject to persistence and other related issues). If the applications do not shut down and try and finish processing the messages, the queue manager will wait until they disconnect unless the admin get bored with waiting and signals immediate shutdown, when the messages will be left as above.
Obviously if the queue manager is signalled to immediate shutdown by the admins without the controlled step above, the same applies.
| pras wrote: |
| 2. Is it possible that messages from queue mgr gouing down will be transferred to another queue manager? |
No. Messages delivered to a queue manager remain on that queue manager. Likewise if a queue manager shuts down, messages will continue to be sent to that queue manager, and sit on the transmit queue, until the cluster notices the queue manager is unavailable.
It is this that makes clustering unsuitible for failover.
You'll find a number of useful discussions on this in here.
_________________
Honesty is the best policy.
Insanity is the best defence.
Last edited by Vitor on Fri Jun 12, 2009 4:34 am; edited 1 time in total |
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| bob_buxton |
| Posted: Fri Jun 12, 2009 4:33 am Post subject: |
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Master
Joined: 23 Aug 2001
Posts: 266
Location: England
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On z/OS you can use shared queues if you want messages to be accesible from more than one queue manager
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Bob Buxton
Ex-Websphere MQ Development |
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| bruce2359 |
| Posted: Fri Jun 12, 2009 5:44 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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| Quote: |
| This queue has 1000 messages in both the queue managers |
The exact same 1000 messages would not be on both cluster queues. Clusters do not replicate.
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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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