Hi,
I think the advice to stay away from distributed transactions is universal
design advice. Basically using distributed transactions just about
guarantees bad performance, as resources get tied up waiting for the 2pc to
make its way to all those other machines or vms not once but twice. If at
all possible, if you need things to happen on several machines, use
transactional messaging (jms, jbossmq) to break the work up into pieces
that can be all done on one machine + 1 resource manager + 1 message to the
next machine. I don't know what jboss/jbossmq actually does in this
scenario, however with a db and a message que as your transactional
resources the db (the slow part) could use 1pc:
1. prepare message commit
2. 1pc on db
3. commit message.
This should be roughly as fast as 1pc to the db, since jbossmq is running
in the same vm as the rest of jboss.
I learned the most about this subject from the (pre ejb) book "High
Performance Client Server" by Loosley and Douglas, isbn 0-471-16269-8
david jencks
On 2001.06.16 12:57:44 -0400 Phan Anh Tran wrote:
> We are at design time for a real system. Your suggestion "don't use it"
> is
> that due to JBOSS specific implementation issues or is it a universal
> design advice?
>
> Do you have a copy of Vlada talk? Thanks.
>
> Anh
>
> ----- Original Message -----
> From: "marc fleury" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, June 16, 2001 3:24 AM
> Subject: RE: [JBoss-user] Obtaining a transaction from outside JBoss in
> another VM Plan
>
>
> > yes anatoly ackerman finished an integration of Tyrex (real DTM) in
> JBoss.
> >
> > We truly truly discourage the use of DTx (even Vlada matena had a full
> talk
> > on that). So my question is "are you at design time" (in which case
> don't
> > use it) or is this "real life".
> >
> > marcf
> >
> > |-----Original Message-----
> > |From: [EMAIL PROTECTED]
> > |[mailto:[EMAIL PROTECTED]]On Behalf Of Phan Anh
> > |Tran
> > |Sent: Saturday, June 16, 2001 3:11 AM
> > |To: [EMAIL PROTECTED]
> > |Subject: [JBoss-user] Obtaining a transaction from outside JBoss in
> > |another VM Plan
> > |
> > |
> > |When does JBOSS plan to support the obtaining and using a transaction
> from
> > |another VM? 2.2.3? 2.3? Anytime in the near future?
> > |
> > |[App/VM1] <-> [EJB1,EJB2,.../JBOSS/VM2]
> > |
> > |App needs to setup and control the transactions, so in essence, my
> > |App needs
> > |to be able to obtain a UserTransaction via JNDI from a separate VM. I
> > |believe this feature is not supported right now, but I would like to
> > |understand when the feature is planned to be incorporated into JBOSS?
> > |Thanks.
> > |
> > |Anh
> > |
> > |
> > |
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