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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Sun, 02 Mar 2014 06:58:19 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917304#comment-13917304
] 

Shai Erera commented on LUCENE-5476:
------------------------------------

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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