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https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917304#comment-13917304
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Shai Erera commented on LUCENE-5476:
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I agree Mike. Rob wrote though in a previous comment: _"The old style sampling
indeed had a fixed sample size, which I found very useful"_, so I assumed
that's something he wants to push for in this issue as well. I'm OK w/
re-introducing sampling in baby steps, but if Rob's goal is to use sampling +
fixed sampling, then we should help him do that in this issue - there's no
reason to break this into two issues?
Rob, if you only want to introduce sampling ratio, then I agree with Mike that
SamplingParams is an overkill for this issue. And in anyway I think a separate
sampling package is an overkill as well. If sampling code grows, we can always
refactor and move it under its own package.
> 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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