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From Steve Vinoski <vino...@iona.com>
Subject Re: clustering
Date Fri, 22 Dec 2006 18:30:59 GMT

On Dec 22, 2006, at 1:24 PM, Carl Trieloff wrote:

> Steve Vinoski wrote:
>> On Dec 22, 2006, at 1:16 PM, Carl Trieloff wrote:
>>> Tim Fox wrote:
>>>> Personally I would never use a total ordering protocol (e.g.  
>>>> totem) to implement clustering for messaging.
>>>> Naive clustering approaches often try to replicate the queue  
>>>> state machine across different nodes, and require some kind of  
>>>> total ordering to ensure the states are consistent.
>>>> You'll find this approach doesn't scale, since every replica in  
>>>> the cluster has to receive all updates from every other node.  
>>>> Therefore the amount of load on a particular node increases  
>>>> linearly with the number of nodes in the cluster.
>>> yes, exactly - thus totem is only useful for the cluster  
>>> management, not the data replication. That is why I asked about  
>>> those pieces and not data replication.
>> Given that people obviously have opinions on how we should  
>> implement clustering, it would be nice to get them captured in the  
>> wiki. Any takers?
>> --steve
> Alan has already done so.

I don't mean the design note, I mean implementation.


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