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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">Community</a></h1>
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To scope or not to scope (domain.xml)
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reply from <a href="http://community.jboss.org/people/jason.greene%40jboss.com">Jason Greene</a> in <i>Management Development</i> - <a href="http://community.jboss.org/message/536347#536347">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Brian Stansberry wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Excellent question!  We need to agree on the definition of some terms.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>To me a "domain" is a set of servers meant to be managed as a unit (acknowledgment: how things are "managed as a unit" is vague/fuzzy; a key task is to clarify exactly what that means.) The servers don't need to all have a homogenous profile, as people may wish to tier things. (In example above written for the clustering meeting the "DataGrid" profile was meant to describe a bunch of servers running Infinispan to serve as large scale grid storage behind a JEE tier.)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I see a domain as needing to allow multiple clusters, even ignoring the different tier idea. Mutliple clusters are a useful mechanism for a rolling upgrade; you subdivide your overall capacity into N smaller clusters, and then can upgrade those by taking a cluster at a time off line. This is needed instead of a rolling upgrade of 1 server at a time within the same cluster if the new version of the app can't co-exist with the old in the same cluster (e.g. incompatible state).</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a slightly simpler definition, but is essentially the same as what you are describing.  I used it in req 1:</p><p>"A <strong><em>domain</em></strong> is a management policy that applies to one or more servers/nodes, which may or may not be part of a cluster"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In other words, the only thing that every member of the domain has in common is the fact that they have the same domain.xml file.  A better definition would probably be. "A domain is a management policy that applies to one or more servers/nodes, which may or may not be part of a homogenous group". When you think about it, a server-group, and a cluster are really the same thing, the only difference is that the cluster has an additional set of services that a basic group does not. This was what I meant by the cluster-service tag, a way to specify how a group would cluster a particular service (maybe not all services should be clustered). Although it was just something I through out there as an example. A better way likely exists</p></div>
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