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From Filip Hanik - Dev Lists <devli...@hanik.com>
Subject Re: Tomcat 6 Member uniqueId
Date Tue, 30 Oct 2007 18:12:25 GMT
with static members, the uniqueId doesn't really matter.
The uniqueId is used to be able to differentiate between the same node 
joining a cluster, then crashing and then rejoining again.
if the uniqueId didn't change in between this, there is no way to tell 
the difference between a node going down, or just leaving the cluster 
and rejoining.

I think I need to add an "auto" flag for the static members, so that we 
can achieve the same func with static members.
but in 99.9% of all cases, the unique Id means nothing, it's there to 
add in support for more advanced future fail over handling.

Filip


Andrew R Feller wrote:
> In declaring static members for Tomcat 6 session replication, is there a
> recommended way to determine uniqueIds for each member?  Are these some
> randomly chosen IDs?  Here is the static membership example from
> http://tomcat.apache.org/tomcat-6.0-doc/config/cluster-interceptor.html:
>
>  
>
> <Member className="org.apache.catalina.tribes.membership.StaticMember"
>         port="5678"
>         securePort="-1"
>         host="tomcat01.mydomain.com"
>         domain="staging-cluster"
>         uniqueId="{0,1,2,3,4,5,6,7,8,9}" />
>
>  
>
> Thanks,
>
>  
>
> Andrew R Feller, Analyst
>
> Subversion Administrator
>
> University Information Systems
>
> Louisiana State University
>
> afelle1@lsu.edu
>
> (office) 225.578.3737
>
>  
>
>
>   
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