[infinispan-dev] ISPN 200

[Emmanuel Bernard]

You give up any hope of implementing sorting (explicit or using relevance).

On 15 sept. 2010, at 12:16, Manik Surtani wrote:

> How about something like:
> 
> - Broadcast the query
> - Every node creates the QueryHits inst, runs the query and collects results.  Starts streaming the results back immediately.
> - The lazy iterator returns to the user immediately, and maintains an internal cache of results coming in from N remote QueryHits instances
> - iterator.next() blocks until this cache has available entries to return.
> - on an implementation level, the GetHItsCommand (or something like that) could return with a single hit, or N hits, with a flag of whether more hits are available or not.
> 
> Does that help?
> 
> Manik
> 
> 
> On 14 Sep 2010, at 20:46, Israel Lacerra wrote:
> 
>> Hi guys,
>> 
>> I'm still thinking about it, but I don't have a really good idea about the lazy iterator yet. The only way (that I see) I could make it more lazily is:
>> 
>> - Broadcast the query.
>> - Every node creates a QueryHits instance with the query and keep it in a simple little cache (array, hash, etc)
>> - A "state" of the query is created and every lazyIterator.next() must send a command to a node and get the next hit (the next key).
>> - After a certain time, the instances of queryHits "dies".
>> 
>> It seems to me that this is not too efficient. But I don't have any other ideas.
>> 
>> Do you have any suggestions about it?
>> 
>> thanks!
>> Israel
>> 
>> AnyoneOn Tue, Aug 31, 2010 at 9:14 AM, Israel Lacerra <israeldl at gmail.com> wrote:
>> Hi Navin,
>> 
>> I'm trying to do ISPN-200 (https://jira.jboss.org/browse/ISPN-200) and I don't know how to implement a good lazy iterator in a "distributed way".
>> 
>> (Sorry... my english is not soo good. If you don't understand again, please just ask again!  :)
>> 
>> 
>> Israel
>> 
>> 
>> On Tue, Aug 31, 2010 at 6:27 AM, Navin Surtani <nsurtani at redhat.com> wrote:
>> Hi Israel,
>> 
>> Just a quick question to your issue. What do you mean by you do not have
>> the LazyIterator? I suppose I'm not really understanding what your issue
>> is. Is it just that you don't want the lazy version or you don't know
>> how to use it? :S
>> 
>> 
>> On 25/08/10 14:39, Israel Lacerra wrote:
>> > Ok, Manik!
>> >
>> > I've already have a code working, but not too "lazy" (and without the
>> > "sort" part). I get the keys on all nodes, and then I use them. So I
>> > have a EagerIterator, but not the LazyIterator. :/
>> >
>> > I'll think about it...
>> >
>> > thanks
>> >
>> > On Wed, Aug 25, 2010 at 10:23 AM, Manik Surtani <manik at jboss.org
>> > <mailto:manik at jboss.org>> wrote:
>> >
>> >
>> >     On 24 Aug 2010, at 17:20, Israel Lacerra wrote:
>> >
>> >      > Manik,
>> >      >
>> >      > What you mean by:
>> >      > "   * The calling node returns a CacheQuery impl that lazily fetches
>> >      > and collates results from the cluster." (JIRA)
>> >      >
>> >      > Is enough if each node returns a list of keys and then, we lazily
>> >     get the values using the keys? Or the process has to be more lazy yet?
>> >
>> >     I think it can be "more lazy" as you said.  :)
>> >     --
>> >     Manik Surtani
>> >     manik at jboss.org <mailto:manik at jboss.org>
>> >     Lead, Infinispan
>> >     Lead, JBoss Cache
>> >     http://www.infinispan.org
>> >     http://www.jbosscache.org
>> >
>> >
>> >
>> >
>> >
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>> >
>> >
>> >
>> >
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>> 
>> 
>> --
>> Navin Surtani
>> Intern Infinispan
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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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