[jboss-dev-forums] [Design of Clustering on JBoss (Clusters/JBoss)] - Re: Distributed Lock Mechanism

[bela@jboss.com]

There is a DLM that's part of JGroups but it is somewhat unsupported (I didn't write it and the guy who did is too busy to support it): http://www.koders.com/java/fidC73888EED1C2ECCDD56AF33274914F9AB36641F7.aspx?s=DistributedLockManager

The existing DLM is also a bit costly, as it does a 2-phase lock acquisition phase. Also, IIRC it requires total consensus, not majority-based consensus as you described above.
You also have to solve the issue where a member which is currently holding the lock crashes. In this case, you have to release all the locks held by a crashed member.

If you submit a concise spec then something like what you described could be implemented in a few days...

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