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| Autoreconnect with JMS |
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| mrk.for.dev |
 Posted: Tue Apr 27, 2021 7:38 am Post subject: Autoreconnect with JMS |
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Novice
Joined: 11 Jan 2021
Posts: 23
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A question that may seem easy to you but is not for me 
What is the purpose of an autoreconnect?
Does it have to be configured on the QM only?
Or does the application code need to be updated as well?
MQ Version: 9.2.1
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| fjb_saper |
| Posted: Tue Apr 27, 2021 4:41 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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It's a property of the connection factory, and you really want it if you are using a uniform cluster... 
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| mrk.for.dev |
| Posted: Tue Apr 27, 2021 11:06 pm Post subject: |
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Novice
Joined: 11 Jan 2021
Posts: 23
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| If we use a RDQM cluster, and the application is connected to the Queue Manager using a floating IP address, we may need this autoreconnect? |
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| fjb_saper |
| Posted: Wed Apr 28, 2021 1:00 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| mrk.for.dev wrote: |
| If we use a RDQM cluster, and the application is connected to the Queue Manager using a floating IP address, we may need this autoreconnect? |
Yes you do. Every time the host changes in RDQM...
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| hughson |
| Posted: Wed Apr 28, 2021 3:35 am Post subject: Re: Autoreconnect with JMS |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| mrk.for.dev wrote: |
| What is the purpose of an autoreconnect? |
Auto-reconnect remakes the connection to the queue manager when you lose it, say because of a network blip, or longer outage such as a failover of an HA or RDQM queue manager, or queue manager recycle.
If you don't use it, you can instead code your application to catch the error that it will be given when the connection is lost, and remake the connection explicitly in your code. Auto-reconnect just does it automatically to save you having to code for it explicitly.
You configure it at the application side not at the queue manager.
Cheers,
Morag
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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| mrk.for.dev |
| Posted: Wed Apr 28, 2021 7:08 am Post subject: |
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Novice
Joined: 11 Jan 2021
Posts: 23
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Thank you very much for your help.
I created a JMS app to test the autoreconnect with
| Code: |
| cf.setIntProperty(WMQConstants.WMQ_CLIENT_RECONNECT_OPTIONS, WMQConstants.WMQ_CLIENT_RECONNECT); |
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Test OK: when I restart the MQ instance after the application connects and before the
Test KO: when I restart the MQ instance, when the application is waiting on consumer.receive().
Is this normal to have an error : JMSCMQ0002: 'MQCMIT and ('MQCC_FAILED') ; reason '2003'?
If not, should an application that connects to MQ stay connected all the time until it reads a message? |
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