[jboss-dev-forums] [Design of JBossCache] - Re: Custom data versions

[manik.surtani@jboss.com]

BTW, the reason why custom data versions are important in Hibernate's use case is detailed below.

* Node in DB has v1
* Server1 writes v2 to the cache and the db.
* This results in an invalidation message clearing the state of the node in neighbouring Servers.
* Server2 does a read from the db before Thread1 completes.  Gets v1.
* Server2 attempts to put v1 in the cache, but there is a race condition and this happens after Server1's invalidation message comes in.
* Server2's put succeeds and Server1's state is invalidated.

Caches now have v1 while the db has v2!!



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