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MQSeries.net Forum IndexGeneral DiscussionPlease explain fail if quiescing

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MABeatty1978
PostPosted: Thu Sep 28, 2017 6:28 am Post subject: Please explain fail if quiescing Reply with quote

Acolyte

Joined: 17 Jul 2014
Posts: 52

I understand what the mqoo-fail-if-quiescing option does and its purpose.... but I'm struggling to understand the reasoning for using it.

What is a use case that I would not want to use it?
What is a use case that I would want to use it?

Thank you.
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Vitor
PostPosted: Thu Sep 28, 2017 6:40 am Post subject: Re: Please explain fail if quiescing Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25070
Location: Ohio, USA

MABeatty1978 wrote:
What is a use case that I would not want to use it?


- you have a badly designed application that absolutely has to finish a large amount of processing (e.g. a file) once it's started because it can't be restarted / rerun
- you really dislike the MQ Admin at your site and don't think he should have complete control over the queue managers he's responsible for
- you think it's fun to have applications in an inconsistent state following a forced closedown and watch everyone trying to recover (and blaming the MQ Admin - see also above)

MABeatty1978 wrote:
What is a use case that I would want to use it?


All the time. On all MQI calls.
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bruce2359
PostPosted: Thu Sep 28, 2017 7:40 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8080
Location: US: west coast, almost. Otherwise, enroute.

Quite simply, if the sysadmin issues the endmqm command, do you want your application to be notified - so that it can gracefully end its processing (complete units of work) ?
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MABeatty1978
PostPosted: Thu Sep 28, 2017 7:50 am Post subject: Reply with quote

Acolyte

Joined: 17 Jul 2014
Posts: 52

bruce2359 wrote:
Quite simply, if the sysadmin issues the endmqm command, do you want your application to be notified - so that it can gracefully end its processing (complete units of work) ?


If it doesn't fail, what happens to the message? Will end stay on the queue (assuming persistence) when the qmgr comes back up or will it (could it) be lost.
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bruce2359
PostPosted: Thu Sep 28, 2017 8:52 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8080
Location: US: west coast, almost. Otherwise, enroute.

Fail if quiescing means that the MQI call will receive a reason code and completion code telling you ONLY that the qmgr is quiescing.

Your program should complete UofW's (either MQCMIT or MQBACK, as your business rules dictate) and end the program.

More specifically, if the qmgr is quiescing, AND an MQGET call with MQGMO_FAIL_IF_QUIESCING will NOT deliver a message from the queue. An MQPUT call with MQPMO_FAIL_IF_QUIESCING will not put a message to a queue. So, no message(s) will be 'lost'.
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