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