[infinispan-dev] ISPN-200

[Israel Lacerra]

Ok! Understood.

So I'll try to use RpcManager to broadcast the query.

Thanks!
Israel

On Fri, Jun 18, 2010 at 6:42 PM, Manik Surtani <manik at jboss.org> wrote:

>
> On 9 Jun 2010, at 05:45, Israel Lacerra wrote:
>
> > Manik,
> >
> > About the "map" part of the map/reduce of ISPN-200.
> >
> > Looking in the code, my intention is(briefly) create a ReplicableCommand
> in CacheQueryImpl and then use RpcManager to make the query on all nodes.
> >
> > But ISPN-200 depends on ISPN-39, right?
>
> Well, not precisely.  They are related and a degenerate case of ISPN-39
> *could* work for you, but isn't necessary.  Let me explain:
>
> ISPN-39 is about pushing tasks to nodes based on key.  So, you may say
> something like, here's a task, T, which requires keys K1, K2, K3.  The
> DistributionManager could then be used to determine the most appropriate
> node(s) to send T to, and process it there.
>
> Now in the case of ISPN-200, you don't know which nodes contain the entries
> you are looking for.  So you would need to broadcast the task, T, which in
> this case is a query task, to *all* nodes.  So while it is similar to
> ISPN-39 in that it executes remote tasks, the logic of determining which
> nodes to execute the task on is different - you would need to execute the
> task on all nodes all the time.
>
> Hope this clarifies things a bit.  :)
>
> Cheers
> Manik
>
> > This dependecy is about the map part? The idea behind ISPN-39 is to
> migrate a computation to other nodes? Like a "continuation"? And then
> ISPN-200 will use this api to make the query on all nodes?
> >
> >
> > thanks!
> >
> > Israel
> >
> >
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>
> --
> Manik Surtani
> manik at jboss.org
> Lead, Infinispan
> Lead, JBoss Cache
> http://www.infinispan.org
> http://www.jbosscache.org
>
>
>
>
>
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