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From "Dan Cooper (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2894) Implement distributed pivot faceting
Date Mon, 05 Mar 2012 17:01:58 GMT


Dan Cooper commented on SOLR-2894:

Added a patch to provide distributed pivot faceting.  We've been running this code for a while
now and it seems to work OK, also created a unit test to test distributed pivot faceting on
a small set of data.

The patch was created against Solr trunk revision 1297102.

It should perform in much the same way as single shard pivot faceting.  It only sorts by count
if you specify that option otherwise it returns results in the order they were generated (may
be useful is performance is important but ordering is not).  Most will want to specify facet.sort=count.
 This patch also supports limiting results using facet.limit.

To do the merge I'm converting the NamedList objects that get returned by each shard in a
giant map (should be more efficient for merging the results) and then converting back into
a NamedList when the merge is complete.  This merge should support N depth pivots but I've
only properly tested a depth of 2.

I've added some new parameters to support the features we require from pivot faceting and
thought they may as well go in the patch in case others find them useful.

* facet.pivot.limit.method
** set to 'combined' if you want only the N number of top results to be returned across all
pivots, where N is set by facet.limit. e.g. if you pivoted by country,manufacturer and limited
by 5, obviously the top 5 countries would be returned, but only the top 5 manufacturers by
combined total would be returned too. e.g. Each country would return the same 5 manufacturers
(or less if no results).

* facet.pivot.limit.ignore
** Ignores the specified field from the limiting operations. e.g. if you pivoted by country,manufacturer
and limited by 5 and set facet.pivot.limit.ignore=country then you would get all available
countries returned (not limited) but only 5 manufacturers for each country.

Can someone test the patch and give some feedback?
> Implement distributed pivot faceting
> ------------------------------------
>                 Key: SOLR-2894
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.0
>            Reporter: Erik Hatcher
>         Attachments: distribPatch-05-03-12.txt
> Following up on SOLR-792, pivot faceting currently only supports undistributed mode.
 Distributed pivot faceting needs to be implemented.

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