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https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917189#comment-13917189
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Michael McCandless commented on LUCENE-5476:
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I don't think we need a sampling package (overkill), and I also don't think we
need a separate "config" class (SamplingParams/Config) which will bring
complexity/questions itself; I think it's a non-goal here to revive the
previous sampling implementation with all of its complexity, nor to push all of
this responsibility onto Rob, who's doing great work here.
Rather, I think we should start simple (what Rob needs, here), commit that, and
iterate from there, bringing back features as users need them.
> 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, 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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