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

[manik.surtani@jboss.com]

Yup that pretty much sums it up.  Concurrent updates will be dealt with exactly as they are dealt with right now.

Regarding releasing, it is easier than you think: DataVersions were a strictly Optimistic-Locking feature.  With MVCC, we never made any promises that DataVersions would apply.  Just as we ignore custom data versions with Pessimistic Locking, I expect to do the same with MVCC.

The problem with leaving versioning logic in MVCC is that it is pretty central.  (Use VersionedNode instead of UnversionedNode, different write-skew check, different ways of handing custom data versions which may be unnecessary).  I'd rather we leave this out (if the logic makes sense) and move on from a fragile and broken API.  :-)

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