[jboss-user] [JBoss Cache: Core Edition] - Re: is it possible for MVCCInvocationContext to have null mv

[manik.surtani@jboss.com]

"bstansberry at jboss.com" wrote : 
  | Manik, why is the removeNode call not removing the node? Is the MVCC code detecting that the node didn't exist when the get() call happened and therefore turning the removeNode into a no-op?
  | 

Yes.  This is consistent with R_R semantics in that you only modify data that you read.  Now if write skew detection was enabled (by setting writeSkewCheck to true) this case would throw a DataVersioningException.

See [1] for details on write skews.  And contrary to what the docs say, writeSkewCheck is false by default.

[1] http://www.jboss.org/file-access/default/members/jbosscache/freezone/docs/3.0.3.GA/userguide_en/html/transactions.html#transactions.locks.mvcc (See section on write skews)

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