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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Tue, 04 Mar 2014 13:00:23 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13919348#comment-13919348
] 

Robert Muir commented on LUCENE-5476:
-------------------------------------

-1 to adding this XOrShiftRandom to lucene/core. There is absolutely no need for it to be
here. We are an IR library, not a JDK. Just because its "useful" is _not_ good enough to expose
something as a public API. 

Moreover, this class does not extend java.util.Random, has no statistical tests, etc. Doesn't
belong as a public api in lucene core. please keep it package private in facets.

> 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,
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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