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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3855) DocValues support
Date Thu, 08 Nov 2012 14:11:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493197#comment-13493197
] 

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

Here are the details:
 - stored fields and doc values are considered very different features (with different parameter
names in the schema to enable/disable them)
 - fl=* would only load stored fields by default (so fields that have doc values would also
need to be stored if you want them to be loaded with fl=*),
 - the fl parameter can accept field names that have doc values but are not stored (and this
would work as expected),
 - DocValues would be useful for documents' unique keys and version numbers (because having
fast random access to these fields is important)
 - if the fl parameter only contains one field that has both doc values and stored fields
enabled, it makes sense to use doc values (same number of disk seeks in the worst case). Otherwise,
it should stick to stored fields by default. It might make sense to add an option to force
doc values with several fields in the field list (fl.docValues=true?) but we should add appropriate
warnings about it in the docs.

I'll update my patch soon. Yonik, please correct me if I'm wrong!
                
> 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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