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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-3855) DocValues support
Date Fri, 05 Oct 2012 14:40:02 GMT

     [ https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand updated SOLR-3855:
-------------------------------

    Attachment: SOLR-3855.patch

Initial patch:

DocValues can be:
 - configured on a per-field-type basis (docValueType=...),
 - enabled on a per-field basis (docValues=true/false)

and are available for the following field types:
 - StrField,
 - UUIDField,
 - Trie*Field,
 - BoolField.

When doc values are enabled, they have precedence over the field cache for {{getValueSource}}
and {{getSortField}}, however faceting and stats cannot use doc values yet (I would like to
do this as a separate issue).

I force fields that have doc values enabled to be single-valued and to be either required
or have a default value.

I also modified a lot of code (ReturnFields especially) to make DocValues behave like stored
fields. I think this would be great for ID fields. In a cluster that has {{numShards}} shards,
it would help decrease the number of disk seeks in the .fdt file (which is often too big to
fit entirely in the OS cache) per request from {{(numShards * (start + rows) + rows)}} to
{{rows}}.

The patch is not committable yet, and I have {{BasicDistributedZkTest.testDistribSearch}}
that always fails (not sure why yet...) but I'd love to have some feedback to know whether
it is going in the right direction.
                
> 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
>
>
> 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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