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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Compute Node accessing DB retry

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mqjeff
PostPosted: Tue Jul 14, 2009 5:52 am    Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17447
angka wrote:
So there is no way to configure the compute node to retry accessing the database until it is up??


, there is a way.

angka wrote:
How many times the compute node will try to connect to the Data source before it fails?

As many times as you code it to do so within your DECLARE HANDLER block.

angka wrote:
message affinity

Don't do that.
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Vitor
PostPosted: Tue Jul 14, 2009 6:06 am    Post subject: Reply with quote

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Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
At the risk of being as picky as you were a while back, that's not configuring the compute node - that's coding a retry strategy. There are a number of ways to have failing messages re-presented after a period of time, one of these is the way you mention, most of the others have been discussed in here at one time or another.

Many of these methods founder on the rocks of message affinity - any retry method in use here would have to ensure that failed messages was reprocessed before new messages. This poses additional challenges if there are new messages sitting on the input queue and failed messages sitting on a backout queue waiting for a timeout to expire.

I'm sure also you were not advocating a DEFINE HANDLER that just kept retrying until the database was back (to pre-empt the poster's next question).
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