[infinispan-dev] NBST design

[Adrian Nistor]

Hi Galder,

The intention is to decouple membership changes from the actual state 
transfer as much as possible. But they are still related of course. So 
in your example, when a node leaves the cluster everybody has to 
immediately remove it from the CH to avoid sending commands to a dead 
node. This all we need to care for now. The actual state transfer to a 
new backup owner is going to happen immediately after (but in a separate 
flow) when the rebalancer notices the imbalance (< num_owners) and acts 
accordingly. This separation allows us to process multiple joiners and 
leavers without disturbing any in-progress state transfer.

Cheers,
Adrian

On 08/15/2012 01:19 PM, Galder Zamarreño wrote:
> More comments:
>
> Leave flow, step 2: "The topology id is not incremented because the new topology does not have state to be transferered with respect to previous topology."
>
> Hmmm, if you have 2 owners for data and one leaves, aren't you gonna have to do some transfering to find a new backup owner for that data?
>
> On Aug 15, 2012, at 11:24 AM, Adrian Nistor wrote:
>
>> Hi,
>>
>> I managed to rewrite the old NBST design document and created a v2 [1]
>> that should cover the interesting aspects. I'm not sure I managed to
>> make it intelligible and sound enough, but this is the best I could do
>> after several attempts at rewriting :)
>>
>> Please read it. Your feedback is welcome!
>>
>> The old document is still there [2] for now but should not be relied
>> upon. I kept it because some parts of it might still be relevant and
>> could be moved to v2 doc, but I don't think they are essential in
>> understading the code of our pull request. Dan, could you have a look if
>> there are any bits that we need to move to v2?
>>
>> Thanks,
>> Adrian
>>
>> [1] https://community.jboss.org/wiki/Non-BlockingStateTransferV2
>>
>> [2] https://community.jboss.org/wiki/Non-blockingStateTransfer
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> --
> Galder Zamarreño
> Sr. Software Engineer
> Infinispan, JBoss Cache
>
>
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