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MQSeries.net Forum IndexGeneral IBM MQ Supportchannel retry count

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KIT_INC
PostPosted: Thu Jun 08, 2017 4:57 am Post subject: channel retry count Reply with quote

Knight

Joined: 25 Aug 2006
Posts: 522

This is more for educational purpose. I am reading the channel definitions for sender channel. The channel goes into long retry after the short retry is not successful. I noticed that the SYSTEM.DEF.SENDER has LONGRTY(999999999) LONGTMR(1200). If I understand it correctly, MQ will try to start the channel 999999999 times every 20 minutes and this is a lot of years. A lot of us take the defaults when creating channels, I was wondering if there is any recommendations on changing this long retry parameters or it is better to just to use the default value.
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mqjeff
PostPosted: Thu Jun 08, 2017 5:10 am Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17448

It's certainly better to change this if you need to know that a channel can't be started without manual effort...

If you have some kind of monitoring that will tell you that the channel is in a retrying state, or not up, however, you can avoid changing this and rely on your monitoring.
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PaulClarke
PostPosted: Thu Jun 08, 2017 9:11 am Post subject: Reply with quote

Sentinel

Joined: 17 Nov 2005
Posts: 861
Location: New Zealand

Be aware that at the end of the retry sequence, if not successful, the channel will go into STOPPED state. This means it will never get going again without something external to the Queue Manager kicking it into life again. That is why the default is to essentially retry forever.

Cheers,
Paul.
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Paul Clarke
MQGem Software
www.mqgem.com
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KIT_INC
PostPosted: Thu Jun 08, 2017 9:48 am Post subject: Reply with quote

Knight

Joined: 25 Aug 2006
Posts: 522

Thanks for the response. It is probably safer to leave it as default.
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gbaddeley
PostPosted: Mon Jun 12, 2017 4:10 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1732
Location: Melbourne, Australia

Agree, leave the long retry parameters at defaults.

There may be some benefit in altering the short retry parameters to more quickly start a channel if a typical network or server outage exceeds the default short retries. eg. Alter to 50 short retries at 300 second intervals. YMMV.

BTW, if you find a SENDER channel in RETRY status, you can manually issue a START command against it to force an immediate retry. You don't need to wait for the long retry interval to tick over, or STOP then START it.
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