[jboss-dev-forums] [Design of JBossCache] - Re: PojoCache uses a special node factory

[ben.wang@jboss.com]

This is interesting proposal, Brian. :-)

But I am still pondering will it really help. I have been grapling with this problem for a while now since I encountered this in the "stress" test env.

Basically, in release 2.0, since we move to the flat-space approach as all the real POJO attachment happens at "__JBossInternal__" node. E.g., we will store the real POJO under, say, "__JBossInterna__/e4xx99ssjswi" node.

This imposes the fqn "__JBossInternal__" as the bottleneck as whenever I need to map another POJO, I will need to obtain a WL on "__JBossInternal__" first. And note that WL is needed for both attach and detach (a la, remove) as well.

So question is what options that we have to improve the concurrency while maintaining the correctness? I am finding not a lot, other than using the Region concept to improve it somewhat.

Can a specialized Node for "__JBossInternal__" help? During the creation and removal of child node, actually I can forgo the interceptor chain and just rely on the Node ConcurrentHashMap to provide synchonization. But I will run into problem when I need to rollback either attach or detach operations (unless I still go thru the interceptor stack).

Any thought?


View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3999350#3999350

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3999350