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Struts & Hibernate
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| | | - Re: Regarding restricting number of instant for MDB - Found word(s) | - Re: Regarding restricting number of instant for MDB - Found word(s) 2004-07-19 - By Igor Cunko
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> -- --Original Message-- --
> From: An interest list for Sun Java Center J2EE Pattern Catalog
> [mailto:J2EEPATTERNS-INTEREST@(protected)] On Behalf Of Stefan Frank
> Sent: Monday, July 19, 2004 5:12 AM
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Re: [SPAM] - Re: Regarding restricting number of instant for MDB
> - Found word(s) list error in the Text body.
>
> I'd really like to hear, wether somebody is currently using MDB for this
> kind of "task-farming": We tried this in a similar project and ended up
> with all sorts of dead-lock-problems: Make sure, that you *really*
In application we have there is a lot of processes which can take hours in
some case (building complex tree, huge resulting data sets), except profile
updates all other interactions in system are done via MDB-s. In order to
throttle number of concurrent jobs (some external systems can't handle load)
we are limiting number of MDBs available at given stage. All together we
have around 25 MDBs corresponding to different system/process combinations,
also interesting benefits are you can prioritize processing so we are able
to bump process up/down in processing chain if needed and because of
persistence in queue our application can start exactly at correct point
after restart (if needed) , customer loves this restart ability. This
application is in production for almost 2 years pumping around 25000 records
per sec. Granted you better know how transactions are related otherwise you
are in for surprise.
Igor
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