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Looping msg flows on z/OS

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ahes

Posted: Mon Aug 26, 2002 10:53 am Post subject: Looping msg flows on z/OS

Newbie

Joined: 13 Jul 2002
Posts: 7

A few times we have had bad experiences with a looping msg flows.
In cases where we made a programming error in a message flow causing an endless loop in our ESQL, we had no way to recover expect stopping the whole broker.
Once such an event happens, the broker seems to be so busy executing some esql, that it won't process anything else (new deploy, stop/start msgsflow).

Anyone experienced the same problem ? Or does anyone now an elegant way to deal with a situation like this ?

CodeCraft

Posted: Mon Aug 26, 2002 12:30 pm Post subject:

Disciple

Joined: 05 Sep 2001
Posts: 195

Once this happens you've effectively blocked a thread in the DataFlowEngine and there's no nice way of curing this. Rather than stopping the whole broker, you could try stopping the relevant execution group using "operations". Not sure if this will work or not.

Two things you could do to prevent this:

1. Test locally on NT first

2. Add a get out clause to loop conditions such that if they behave unexpectedly they'll still terminate.

However, this is just a debugging fact of live!

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