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| MQ Explorer - QCF - Reconnection Page |
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| PeterPotkay |
 Posted: Wed Feb 18, 2015 1:51 pm Post subject: MQ Explorer - QCF - Reconnection Page |
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| fjb_saper |
| Posted: Thu Feb 19, 2015 6:10 am Post subject: |
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I figure this to read as following:
If you happen to bounce the qmgr, and neither the primary nor the failover start up within the configured time you are SOL and will have to do a manual intervention on the (client) application... 
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| PeterPotkay |
| Posted: Thu Feb 19, 2015 6:58 am Post subject: |
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Understood. But until the Timeout interval expires, how fast or how frequently will this thing keep retrying? As fast as possible? Unacceptable. Once every x seconds? OK, but what is x?
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| fjb_saper |
| Posted: Thu Feb 19, 2015 9:25 am Post subject: |
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| PeterPotkay wrote: |
| Understood. But until the Timeout interval expires, how fast or how frequently will this thing keep retrying? As fast as possible? Unacceptable. Once every x seconds? OK, but what is x? |
I thought there was a reconnection interval property somewhere. Maybe even something like short reconnection and long reconnection interval?
Did you look at all the settings for the mqclient.ini file?
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| PeterPotkay |
| Posted: Fri Feb 20, 2015 11:09 am Post subject: |
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I did find this link which explains the default behavior for the client if you don’t specify ReconDelay value in the mqclient.ini.
http://www-01.ibm.com/support/knowledgecenter/SSFKSJ_7.5.0/com.ibm.mq.dev.doc/q032520_.htm?lang=en
By default, the reconnection attempts happen at the following intervals:
• The first attempt is made after an initial delay of one second, plus a random element up to 250 milliseconds.
• The second attempt is made two seconds, plus a random interval of up to 500 milliseconds, after the first attempt fails.
• The third attempt is made four seconds, plus a random interval of up to one second, after the second attempt fails.
• The fourth attempt is made eight seconds, plus a random interval of up to two seconds, after the third attempt fails.
• The fifth attempt is made 16 seconds, plus a random interval of up to four seconds, after the fourth attempt fails.
• The sixth attempt, and all subsequent attempts are made 25 seconds, plus a random interval of up to six seconds and 250 milliseconds, after the previous attempt fails.
This process of reconnection continues, until the client is successfully reconnected to the queue manager, or until the maximum reconnection interval elapses.
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| fjb_saper |
| Posted: Fri Feb 20, 2015 12:21 pm Post subject: |
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Thanks for giving us the reference Peter.
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| PeterPotkay |
| Posted: Wed Feb 25, 2015 12:13 pm Post subject: |
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In this presentation on reconnectable clients, see page 14 where it talks about what is and is not a reconnectable scenario:
http://www-304.ibm.com/support/docview.wss?uid=swg27038186
Can anyone shed some light as to the thought process IBM used for NOT allowing reconnectable clients to kick into auto reconnect with a STOP CHANNEL or an endmqm without –r or –s?
I mean, why not allow clients that have explicitly said they want to reconnect to reconnect in these 2 particular scenarios. Of what benefit would this be?
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