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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Sat, 01 Mar 2014 20:57:22 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917189#comment-13917189
] 

Michael McCandless commented on LUCENE-5476:
--------------------------------------------

I don't think we need a sampling package (overkill), and I also don't think we need a separate
"config" class (SamplingParams/Config) which will bring complexity/questions itself; I think
it's a non-goal here to revive the previous sampling implementation with all of its complexity,
nor to push all of this responsibility onto Rob, who's doing great work here.

Rather, I think we should start simple (what Rob needs, here), commit that, and iterate from
there, bringing back features as users need them.

> 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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