[infinispan-dev] ISPN 200

[Israel Lacerra]

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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>
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