[infinispan-dev] [ISPN-6] Switch to distribution for default entity/collection cache?

[Manik Surtani]

Invalidation should still be the default for entities.  Distributing  
state may be scalable but it will still be more expensive than  
Invalidation, since you still have to marshall entities.

On 2 Sep 2009, at 10:47, Galder Zamarreno wrote:

> Hi,
>
> While working on documenting the Infinispan cache provider, I've been
> thinking on the default cache settings for each Hibernate type:
>
> - Entity/Collection: Bearing in mind the requirement to keep this  
> cache
> synchronous, in the past we've gone for invalidation rather than
> replication because using replication could mean having to replicate a
> lot of data to all nodes in the cluster. For Infinispan however, I was
> thinking of the possibility of making sync distribution default for
> entities though since we are not replicating to everyone any more.
>
> One doubt I have about here is how much of an advantage would be to
> bring an entity from another node in the cluster if present
> (distribution) vs loading it from the database if not available in the
> local cache (invalidation).
>
> The one downside I see of distribution vs invalidation is that if an
> entity is not available locally and is not available in the cluster,
> distribution is more expensive that invalidation, since dist involves
> round trip in cluster and round trip to database, vs round trip to
> database with invalidation.
>
> However, unless eviction kicks in, this should only affect the 1st  
> time
> an entity/collection is queried cos the next time, it will be
> distributed already and potentially in the L1 of the node that  
> requested
> it if it's not one of the owners.
>
> So, I think I would make distribution default for entity/collection.
> Thoughts? I'd still leave an invalidated configuration in the default
> config file so that people can potentially swap to it if they want to.
>
> - Query: I think we should stick to same JBC2/3 default here which is
> local.
>
> - Timestamps: Given the chattiness of this cache, and the low size
> payloads, asynchronous replication still looks to me like a good  
> default
> for this cache.
>
> Cheers,
> -- 
> 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