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From "Ajith Ranabahu" <>
Subject Re: [Axis2] An approach for clustering Axis2
Date Fri, 25 Aug 2006 05:14:16 GMT
Hi Guys,
This seems to be a very good proposal and +1 to go ahead. I am +1
*not* to cluster operation contexts and message contexts since the
overhead will be enormous and we would probably loose the advantage of
the clustering!
Anyway have you guys thought about the following issues ? (I'm not
sure whether these details are already discussed or not. If so bear
with me :))

1. How would the replication happen ?
  How much resources would be used for clustering depends partly on
the mechanism we select to transfer the state - and of course this
brings up the issue whether the contexts are serializable or not
(Since our contexts are 'unrestricted' service authors can put all
sorts of junk there) ! As Rajith suggested we can use something like
JGroups or Tribes underneath or do we go for a relevant WS
specification ?
  I believe there was an idea of using RSS for doing this!

2.  How can you deploy a service in the cluster ?
  Since we are using a remote repository the ability to just drop in
an archive to the remote repo would not suffice (I suppose the lst
file needs to be modified too). This might be  problematic if we have
a hot deployment mechanism.

I'll come up with more comments when I get enough time to think
through the matters :)

Ajith Ranabahu

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