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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4602) Use DocValues to store per-doc facet ord
Date Sun, 23 Dec 2012 10:52:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539016#comment-13539016
] 

Shai Erera commented on LUCENE-4602:
------------------------------------

I created LUCENE-4647 to simplify CatDocBuilder so that we can make this cutover easily (while
still supporting all existing features, e.g. associations).
                
> Use DocValues to store per-doc facet ord
> ----------------------------------------
>
>                 Key: LUCENE-4602
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4602
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>         Attachments: LUCENE-4602.patch, LUCENE-4602.patch
>
>
> Spinoff from LUCENE-4600
> DocValues can be used to hold the byte[] encoding all facet ords for
> the document, instead of payloads.  I made a hacked up approximation
> of in-RAM DV (see CachedCountingFacetsCollector in the patch) and the
> gains were somewhat surprisingly large:
> {noformat}
>                     Task    QPS base      StdDev    QPS comp      StdDev            
   Pct diff
>                 HighTerm        0.53      (0.9%)        1.00      (2.5%)   87.3% (  83%
-   91%)
>                  LowTerm        7.59      (0.6%)       26.75     (12.9%)  252.6% ( 237%
-  267%)
>                  MedTerm        3.35      (0.7%)       12.71      (9.0%)  279.8% ( 268%
-  291%)
> {noformat}
> I didn't think payloads were THAT slow; I think it must be the advance
> implementation?
> We need to separately test on-disk DV to make sure it's at least
> on-par with payloads (but hopefully faster) and if so ... we should
> cutover facets to using DV.

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