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Re: [Vrs-development] (no subject)

From: Bill Lance
Subject: Re: [Vrs-development] (no subject)
Date: Thu, 2 May 2002 14:00:15 -0700 (PDT)

--- address@hidden wrote:
> > 
> > Each LDS would periodically poll the 'cluster' to
> see the
> > state of it.  This is done by Goldwater domains
> anyway,
> > and you can use the API to see if a node is
> available
> > or not.  At least that's the idea.

My working thought about how this would work is not
based on polling activity but on broadcast messaging. 
When a change takes place in the Clusater Image of any
one LDS, that change transaction is broadcast to all
online LDS's updating eaches Cluster Image.  The trick
will be keeping the individual Cluster Images
reasonably coherant and similar.  

Polling might well be necessary to verify the state of
an LDS.  A periodic check sum was suggested once. 
That might not work if the LDS's are in various states
of updating themselves in responce to update messages,

(This Cluster Image thingy is a very intreaging
problem...  :)

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