lucene-solr-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Vijay Tiwary <vijaykr.tiw...@gmail.com>
Subject Re: JSON facet performance for aggregations
Date Sun, 30 Apr 2017 07:58:08 GMT
Json facet on string fields run lot slower than on numeric fields. Try and
see if you can represent studentid as a numeric field.

On Apr 30, 2017 1:19 PM, "Mikhail Ibraheem" <mikhail.ibraheem@oracle.com>
wrote:

> Hi,
>
> I am trying to do aggregation with JSON faceting but performance is very
> bad for one of the requests:
>
> json.facet={
>
>    studentId:{
>
>       type:terms,
>
>       limit:-1,
>
>       field:"studentId",
>
>                   facet:{
>
>                   x:"sum(grades)"
>
>                   }
>
>    }
>
> }
>
>
>
> This request finishes in 250 seconds, and we can't paginate for this
> service for functional reason so we have to use limit:-1, and the
> cardinality of the studentId is 7500.
>
>
>
> If I try the same with flat facet it finishes in 3 seconds :
> stats=true&facet=true&stats.field={!tag=piv1
> sum=true}grades&facet.pivot={!stats=piv1}studentId
>
>
>
> We are hoping to use one approach json or flat for all our services. JSON
> facet performance is better for many case.
>
>
>
> Please advise on why the performance for this is so bad and if we can
> improve it. Also what is the default algorithm used for json facet.
>
>
>
> Thanks
>
> Mikhail
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message