[infinispan-dev] CacheStore redesign: no XA cache stores

[Mircea Markus]

Hi,

I don't think can support XA (JTA) enabled cache stores. Here's why:
- C1 (cache store instance) runs on node N1
- an JTA tx is started on N2 which writes to(has a key that maps to) N1 - both to the DataContainer and C1.
- the JTA transaction manager running the transaction resides on N2, so it's impossible for C1 at N1 (different process) to enlist within that transaction

This limitation doesn't exist for local caches configured with a cache store, but that's rather a particular case.

Our current recovery mechanism supports situations when writing to a cache store fails during commit. If the commit fails, the user is given the opportunity to re-apply transaction's changed and that includes both memory and local storage.

Cheers,
-- 
Mircea Markus
Infinispan lead (www.infinispan.org)