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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3855) DocValues support
Date Thu, 08 Nov 2012 10:55:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493115#comment-13493115
] 

Adrien Grand commented on SOLR-3855:
------------------------------------

bq. Having to know all of the field names to actually get all of the field values is not a
good thing.

Good point. I should rework this part of the patch.

bq. I think we should model the docvalues as stored fields (that's how I always planned on
doing it - but never got around to it). fl=* should still return these fields.

This was my first idea too, but at this time I forced doc values to be memory-resident. I
think Robert's point to not fetch doc values automatically because they could potentially
imply a crazy number of random disk seeks makes sense.

A trade-off could be to only fetch automatically memory-resident doc values but I think it
would be very confusing for users.

bq. I wonder if we could pick a better name?

I used this name because it is the name in the Lucene API and because this feature has been
"marketed" with this name in various blog posts and conference talks. Do you have an idea
for another name?
                
> DocValues support
> -----------------
>
>                 Key: SOLR-3855
>                 URL: https://issues.apache.org/jira/browse/SOLR-3855
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.1, 5.0
>
>         Attachments: SOLR-3855.patch, SOLR-3855.patch
>
>
> It would be nice if Solr supported DocValues:
>  - for ID fields (fewer disk seeks when running distributed search),
>  - for sorting/faceting/function queries (faster warmup time than fieldcache),
>  - better on-disk and in-memory efficiency (you can use packed impls).

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