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mqsistop - effect on existing work?

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zpat

Posted: Mon Dec 21, 2009 3:26 am Post subject: mqsistop - effect on existing work?

Jedi Council

Joined: 19 May 2001
Posts: 5866
Location: UK

Can anyone elaborate what mqsistop does to currently running message flows?

I presume it waits for the current executing flows to complete their processing before closing the broker?

How long does it wait (suppose you have a flow running a MQGET node with a wait interval)?

Is it transactionally safe to stop/start a running broker?

mqmatt

Posted: Mon Dec 21, 2009 4:26 am Post subject:

Grand Master

Joined: 04 Aug 2004
Posts: 1213
Location: Hursley, UK

Transactionally, mqsistop is a safe command to use to bring down a broker as any existing work items are completed before the flow stops. The command will wait a little while (I forget how long exactly), and then fail with a BIP8016 if any execution group could not finish cleanly in the allotted time.

The mqsistop command with '-i' is more severe; if normal shutdown fails and you've specified this parameter, then the command will forcibly stop any execution groups after this time period, and thus end any work items in progress. This will usually trigger a backout if you've enabled transactionality.

nathanw

Posted: Mon Dec 21, 2009 4:58 am Post subject:

Knight

Joined: 14 Jul 2004
Posts: 550

or to put it another way the flows will finish their current unit of work but not read anymore incoming messages thus starting a new unit of work

once all are completed it will shut down taking any errors or transactionality into account

as matt says -i will shut things down alot more severely
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