Small road map question

[roman.mandeleil1]

Hi JBoss Cache fellows,

I see that pessimistic locking is being deprecated for MVCC scheme, the question is why ? I do understand that pessimistic lock scheme has very poor
performance but in some case you don't have any other option. Why to deprecate ? Why it can't be left as an option ?

Thank in advance
Roman

[galder.zamarreno]

In which cases do you wanna use PL instead of MVCC?

[roman.mandeleil1]

Let's say I am working on a trading application, ask orders against bid orders, when there is an order match there is a deal.

The point is that I can't take any chance there. If the order is there I don't want any other cache instance to pull it out. I prefer all the instances to lock, proceed and then go on. The safety factor is very important here.

Regards
Roman

[galder.zamarreno]

A match could modify those orders somehow in which case you'd need a WL and hence others wouldn't be able to match that order. You could also do a get with Option.forceWriteLock() so that reads result on WL. Finally, for any future development, I'd suggest you use Infinispan rather than JBoss Cache since the latter is in maintenance mode now.