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Date: Thu, 6 Mar 2014 08:46:44 +0000 (UTC)
From: "Rob Audenaerde (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12697648.1393495197626.12983.1394095604548@arcas>
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References: <JIRA.12697648.1393495197626@arcas>
Subject: [jira] [Updated] (LUCENE-5476) Facet sampling
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     [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rob Audenaerde updated LUCENE-5476:
-----------------------------------

    Attachment: LUCENE-5476.patch

I have a patch ready that implements the random sampling usign override on {{.getMatchingDocs()}}. It passes the test, so it should be ok :). 

It is slower however (only 3x speedup),  but maybe there is room for optimization?

Exact  :168 ms
Sampled:55 ms


> 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, 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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