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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Sat, 01 Mar 2014 14:02:19 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917072#comment-13917072
] 

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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