[jboss-dev-forums] [Design of Clustering on JBoss (Clusters/JBoss)] - Re: Handling cluster state when network partitions occur

[manik.surtani@jboss.com]

I inherently don't like using a static cluster size configuration.  With larger clusters, nodes joining and leaving the cluster should be seen as "normal" and it should be able to scale up or down without reconfiguration.

Correct me if I am wrong, but if you have {A, B, C} on switch S1 and {D, E} on switch S2, and if S2 fails, does JGroups deliver 2 view changes to {A, B, C} (one without D and one without both D and E) or just a single view change, without D and E?  Assuming FD_SOCK is used for immediate switch failure detection?

If this is the case, can't a split brain threshold be used?  I.e., if a view change is received in which more than N% of members are removed, assume a split brain as opposed to normal drop-offs?

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