[jboss-user] [JBoss Cache: Core Edition] - MVCC Write Skew

zeravlai do-not-reply at jboss.com
Sun Apr 5 18:20:16 EDT 2009

I've been testing with MVCC in order to reproduce write skew. Testing's been done with JPA/Hibernate in this way:

1.- Two concurrent threads read a field of an entity.
2.- Both of them increment (by one) that field based on the value previously read.

Results are as expected. R_R causes a Data Versioning Exception and R_C does not produce any exception.

However, and this is my question, results with the two transactions are the same. Entity field is incremented one with R_R since one transaction rollbacks and same result is seen with R_C though without exception.

Is the behaviour of R_C correct ?

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