[jboss-dev-forums] [Design of Clustering on JBoss (Clusters/JBoss)] - Re: JBAS-4228 Preferred master node for HASingleton

[bstansberry@jboss.com]

"galder.zamarreno at jboss.com" wrote : 
  | 1.-  The intention of JBAS-4228, according to the JIRA, is that if a preferred master is there, use it, otherwise fall back on standard policy. The standard policy imo is the policy that should be applied when no election policies defined, which is, as per HASingletonSupport.partitionTopologyChanged(), :
  | 
  | isElectedNewMaster = isDRMMasterReplica();
  | 
  | So, I think we should have a default policy with this implemented and have PreferredMasterElectionPolicy extend it.

I want it to keep extending HASingletonElectionPolicySimple.  That really is the new default, in the sense that a call to isDRMMasterReplica() is basically the same as a HASEPS with a default 0 position. Extending HASEPS lets us have the simple added feature of that class. 

anonymous wrote : 
  | 2.- Does PreferredMasterElectionPolicy need an MBean interface? We had a chat about this stuff in a previous forum post. I don't think there's a need to have an MBean interface at this level. If anyone wants to check or change this at runtime, this could be done via HASingletonSupportMBean.set/getElectionPolicy() bearing in mind that HASingletonControllerMBean extends HASingletonSupportMBean. Thoughts?

Yeah, give it an MBean interface.  Let people change the preferred master via the JMX console. Changing a string attribute is a lot simple to support via tools vs. having to plug in a new polcy instance.

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