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https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917072#comment-13917072
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Robert Muir commented on LUCENE-5476:
-------------------------------------
{quote}
Also, one thing that we did in the old impl is not use Math.random() or Random
at all. Rather some crazy formula was used to create faster samples. I don't
say we need to do that now, but maybe drop a TODO. At any rate, I don't think
we should use Math.random(), but rather init a Random once and call
nextDouble(). This will also allow to reuse a seed.
{quote}
xor-shift might be a good choice here.
> 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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