[infinispan-dev] Hotrod client intelligence

[Manik Surtani]

On 20 Jul 2010, at 11:59, Mircea Markus wrote:

> 
> On 20 Jul 2010, at 11:48, Manik Surtani wrote:
> 
>> 
>> On 20 Jul 2010, at 11:45, Mircea Markus wrote:
>> 
>>> 
>>> On 20 Jul 2010, at 11:29, Manik Surtani wrote:
>>> 
>>>> 
>>>> On 20 Jul 2010, at 10:52, Mircea Markus wrote:
>>>> 
>>>>> Hi,
>>>>> 
>>>>> Right now we have the following intelligence levels in HR:
>>>>> (0x01) basic client, interested in neither cluster nor hash information
>>>>> (0x02) topology-aware client, interested in cluster information
>>>>> (0x03) hash-distribution-aware client, that is interested in both cluster and hash information
>>>> 
>>>> Transaction aware clients have nothing to do with "intelligence" in that it doesn't affect the way clients discover or route connections to the back-end.
>>> not in that sense.
>>>>  Pls don't pollute this field with orthogonal characteristics.
>>> Then transaction should be supported by all clients implementing the protocol? 
>> 
>> No, but if a client doesn't start a tx, then the backend doesn't care if the client can or cannot ever support transactions, right?
> 
> Each HotRod operation needs to contain the tx id, if it is part of a transaction. 
> a) either we add this now, in 4.1, before protocol completes
> b) or we add it in 5.0 together as per this JIRA. If so, server would need to be aware that client is transactional aware, hence the new intelligence level I was taking about
> with b clients that don't support tx would't need to send an additional field. We had this discussion on a separate thread with galder, I can live with either one of the two. 

What if the field was missing?  Doesn't that implicitly mean the client is not (a) in a transaction or, (b) doesn't support transactions anyway, so inherently is in (a) as well?

Cheers
Manik
--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org




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