[infinispan-dev] ISPN 200

[Israel Lacerra]

Thanks Manik!! I just did not understand the last item..

> - 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.


Israel

On Wed, Sep 15, 2010 at 7:16 AM, Manik Surtani <manik at jboss.org> 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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>>>
>>> --
>>> Navin Surtani
>>> Intern Infinispan
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>>
>>
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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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