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From "Rob Audenaerde (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Tue, 11 Mar 2014 08:04:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13930078#comment-13930078
] 

Rob Audenaerde commented on LUCENE-5476:
----------------------------------------

Thanks again for the good points. 

I currently have an {amortizeFacetCounts} that uses the {IndexSearcher} to retrieve a reader
an a {FacetsConfig} to determine the {Term} for the {docFreq}. I'm not really sure how this
will work for hierarchies though. I will also add the {{totalHits}} as upper bound, great
idea Gilad.

I alse removed the exact assert and switch to an atLeast. Will add a patch soon.



> Facet sampling
> --------------
>
>                 Key: LUCENE-5476
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5476
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Rob Audenaerde
>         Attachments: LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch,
LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch, SamplingComparison_SamplingFacetsCollector.java,
SamplingFacetsCollector.java
>
>
> With LUCENE-5339 facet sampling disappeared. 
> When trying to display facet counts on large datasets (>10M documents) counting facets
is rather expensive, as all the hits are collected and processed. 
> Sampling greatly reduced this and thus provided a nice speedup. Could it be brought back?



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