On Fri, Jun 18, 2010 at 6:42 PM, Manik Surtani <manik@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@jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
http://www.jbosscache.org

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