[jboss-user] [JBossCache] - Re: Behaviour of the cache in case of a node failure

[manik.surtani@jboss.com]

If a node fails during the 2-phase commit protocol, an exception  is thrown internally by the comms layer.  This is trapped and the transaction is marked for rollback, and the TM sees this and initiates a rollback.

If the node does before the 2-pc protocol commences, then the tx does not fail; it just excludes the dead node from the cluster.

There is no difference between a shutdown and a node crashing as far as the 2-pc protocol is concerned.  If the node dies/is shut down in the middle of the 2-pc protocol, it will cause a rollback on the initiator of the commit.  Else, it will be excluded from the cluster before the 2-pc commences.

We detect dead nodes using JGroups' failure detection protocols - FD and FD_SOCK.  See JGroups docs for details on this.



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