Restricting to one instance of an entity per cluster

[senthilcool]

Does the Instance Per Transaction CMP 2.x EntityBean configuration of the CMP2 container restrict the number of entity instances to only one across the cluster OR is it one per instance in the cluster ?

Thanks for the help.

cheers,
senthil

[senthilcool]

Help !!!

[nraghuram]

Instance per Transaction is what it says .. one for each transaction
you can have more than one transaction running at a time on a single m/c also, in which case more than one instance of the entity will be present.
If you dont use IPT then you have a single instance but its not single across the cluster as far as i know
raghu

[senthilcool]

I actually meant to ask about the default locking policy which allows only one active instance per bean.
Does this restrict it to one instance across the cluster ?

[nraghuram]

afaik distributed locking is not present in 3.2 so it will be one instance per node. perhaps a jboss developer can answer that for you
raghu

[juha]

it is instance per node, synchronization is at the DB level (row-locking must be true). As correctly pointed out by the previous poster, there is not distributed locking in 3.2.

-- Juha

[senthilcool]

Thanks.