Re: [infinispan-dev] range query in Infinispan !!
Sanne,
Prabhat and I had a chat the other day and agreed that Infinispan would
be much easier to apply to a large variety of use cases if we could
iterate over ordered keys given a starting point. Cassandra does this by
partitioning (grouping in Infinispan speak) consecutive keys on the same
node for performance reasons. I guess you could use the Query module and
distributed keys for this, but I think it is a bit overkill.
Tristan
On 05/14/2012 06:40 PM, Prabhat Jha wrote:
I have not used Infinispan's Query or Map/Reduce functionalities
yet
because of them not being in JDG yet. Yes, we can use those to get what
I have mentioned. Query should be more straight forward and simpler than
M/R I think. But Query has dependency on Lucene and I have experienced
great pain in the past when using Lucene and FileSystem for shared storage.
My perspective is a bit different. I am arguing for a "simpler" solution
for a problem that I find to be very common. Similar to how in
Cassandra, you can easily query based on a time range and the order you
want.
On 05/14/2012 11:05 AM, Sanne Grinovero wrote:
> why "not using Query" ?
>
> Such features are available in core using Map/Reduce; I don't think
> that different approaches should be provided by core otherwise, there
> is enough complexity in there...
>
> Cheers,
> Sanne
>
> On 14 May 2012 16:58, Prabhat Jha<pjha(a)redhat.com> wrote:
>> Hi,
>>
>> In QuickTweet we needed a way to get most recent x tweets for a user or
>> on a topic. Currently we are implementing it by keeping entries in the
>> cache and updating a bounded FIFO queue in parallel. However, to get
>> most recent data or data for a given time range is a very common use
>> case specially in social media applications. It would be good to see
>> this range feature available in out of box (not using Query) in upcoming
>> Infinispan releases. Thoughts?
>>
>> I can get it started by creating a Jira unless I hear otherwise.
>>
>> Regards,
>> Prabhat
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