[infinispan-dev] DIST and rehashing - again

[Manik Surtani]

Ok, these rehash designs are flawed.  While they work in concept, they  
could lock up a cluster for periods of time while a rehash is in  
progress, since every node may provide some state to every other node,  
and while state is being streamed, a recipient would need to queue  
incoming transactions to be applied on top of any state applied.   
While this will work very well if just one node receives state at at  
time, it won't work if (theoretically) every node receives some state  
(for example if a node leaves).

I have an alternate approach (sketched out in a notebook here) which  
will mean some redesign to the core dist code, I will publish these on  
the wiki when I get back from vacation.

In the meanwhile though, it means no Beta1 today (boo!) but I will  
push out an Alpha5 (yaayy!) since there are a lot of other changes and  
improvements which I want to make public.

Watch this space.

Cheers
Manik


On 8 Jun 2009, at 15:34, Manik Surtani wrote:

> Ok, so here is where I have jotted down designs for rehashing in DIST.
>
> 	http://www.jboss.org/community/wiki/DIST-distributedcachemode#Rehashing
>
> Please have a look and comment accordingly.  Some points:
>
> 1.  Heterogenous nodes are not supported at this time.  I expect to  
> add support for this later.
> 2.  Actual state is transferred using RPC calls.  A more efficient  
> streaming mechanism will come in later.
> 3.  Each view change will result in a rehash event.  Combining view  
> changes to a single rehash is something we would consider for later.
>
> Cheers
> --
> Manik Surtani
> manik at jboss.org
> Lead, Infinispan
> Lead, JBoss Cache
> http://www.infinispan.org
> http://www.jbosscache.org
>
>
>
>
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--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org