Transaction management in cluster

[chaosad]

Hi all!

I am a newbie in this field, so probably this can sound as a fare stupid question, but:

How is it with JBoss transaction management in cluster - can the nodes share transactions and thus balance a load?
Is Tyrex (transaction mgmt.) able to run successfully in JBoss clustered configuration?
What is the benefit of using Tyrex instead of JBoss transaction management?

Thanks.

[slaboure]

The real question you should ask yourself first is: what do you want to use the clustering for? Answers will then seem logical.

So, what are you trying to solve?

cheers,

sacha

[chaosad]

Well,

what we want to implement is client-server application communicating with more databases together. We proposed to use DAO pattern for this. We will use global transactions, so business layer will make call like:

beginTransaction();
dao1.insert(data);
dao2.update(data);
commitTransaction();

where dao1 can be Oracle database and dao2 can be DB2 database, for example.

As we are expecting a lot of user requests at a time, we will probably need to set up a cluster environment and thus transaction manager will probably need to divide some tasks into nodes.

Sometimes I can see using of Tyrex in JBoss, but I really cannot find any reason for this. Is it better configurable, more powerfull?

Thanks.

[slaboure]

don't try to share the load of ONE user i.e. by sharing calls from ONE user to multiple nodes, but instead try to share the load AMONG users => each user will dynamicaly use a different node => no problem of Transaction any more, keep it simply, a Tx started on a node will finish on that node, NO NEED for costly, slow distributed transaction.

Forget about tyrex, it doesn't implement logging, recovery, etc. => everything that should compose a real DTM.

If you really need a DTM (which doesn't to be your specific case), then don't use a toy but use a real strong implementation such as Arjuna DTM. It is fully integrated in JBoss.

cheers,


sacha

[chaosad]

Thanks for the replay!

I was just wondering what is the Tyrex about, if it is better than JBoss TM or why should/should not we use it as it is (for 3.2 was) also included in JBoss distribution package.

Regards.

[slaboure]

Tyrex is advertised as a DTM (distributed TM), while JBossTM is a local TM (XA and non-XA)