[infinispan-dev] HotRod, ClientIntelligence and client-side key location

[Manik Surtani]

On 26 Mar 2010, at 08:42, Galder Zamarreno wrote:

> On Tue, 23 Mar 2010 14:12:19 +0100, Manik Surtani <manik at jboss.org> wrote:
> 
>> 
>> On 23 Mar 2010, at 07:48, Galder Zamarreno wrote:
>> 
>>>> 
>>>> * Hash space size (the modulus for all modular arithmetic, hard-coded
>>>> for now, may change in future).  An int.
>>> 
>>> That would need adding to the response header, wouldn't it?
>>> http://community.jboss.org/wiki/HotRodProtocol#HashDistributionAware_Client_Topology_Change_Header
>> 
>> 
>> Umm, not sure what you mean.  This is has nothing to do with server (or  
>> even endpoint) count... I would have thought this is sent along with  
>> hash function version.
> 
> Oh right, so what you're implying is that the version itself defines the  
> corresponding hash space size? When I first read it, I thought clients  
> could pass different space size for each version, hence why I was  
> wondering if it should be part of the protocol.

No, no - it should be a part of the protocol.

What I meant by "Sent alongside hash function version" is:

   ... bytes... [hash function version][hash space size] ... bytes...   

I foresee making the hash space size a tuning parameter in the future.  This is independent of hash function used.   

> 
>> 
>> Cheers
>> Manik
>> --
>> Manik Surtani
>> manik at jboss.org
>> Lead, Infinispan
>> Lead, JBoss Cache
>> http://www.infinispan.org
>> http://www.jbosscache.org
>> 
>> 
>> 
>> 
> 
> 
> -- 
> Galder Zamarreño
> Sr. Software Engineer
> Infinispan, JBoss Cache
> 
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--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org