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From John Bickerstaff <>
Subject Re: Average of Averages in Solr
Date Thu, 06 Oct 2016 15:56:30 GMT
This may help?  Note the "Bloomberg Analytics" at the bottom of the post...

Quote from article:

   - *Bloomberg Analytics Component for Solr*: Bloomberg Financial Services
   uses Solr extensively, and found the existing statistical packages woefully
   lacking. So, they developed a high-performance framework that can perform
   complex calculations and aggregations on time-series data, and then
   released it to OpenSource.

On Thu, Oct 6, 2016 at 8:53 AM, Shawn Heisey <> wrote:

> On 10/6/2016 12:04 AM, Lewin Joy (TMS) wrote:
> > There is a requirement to take an average on "Amount" field against
> > each "code" field. And then calculate the averages on this averages.
> > Since my "code" field has a very huge cardinality, which could be
> > around 200,000 or even in millions ; It gets highly complex to
> > calculate the average of averages through Java. Even Solr takes a huge
> > time listing the averages. And the JSON response size becomes huge. Is
> > there some way we can tackle this? Any way we stats on stats?
> I wasn't sure what you meant with the first sentence I quoted above, but
> in order to get statistics from your index that are relevant for the
> results of a query, you probably want the stats component.
> Thanks,
> Shawn

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