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https://issues.apache.org/jira/browse/SOLR-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493128#comment-13493128
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Yonik Seeley commented on SOLR-3855:
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Regarding performance - it seems like for most users, the number of docvalue
fields should be relatively small.
One of the big advantages to DocValues is the better caching by the OS - so
"seeks" should often never hit the disk.
For those users where performance is a concern, they should set "fl" to
retrieve only those fields they absolutely need.
Also consider existing working clients where the solr server changes the
storage type of the field for better performance - that shouldn't be visible to
the client (just as changing the precisionStep of a trie type should not be
visible).
Naming:
At some time in the past I was considering storeSep=true/false (until there
were multiple ways to store separately), but I was never crazy about the name.
But since we're just trying to say how the field should be stored, perhaps just
overload that parameter?
stored=true // same as today
stored=[docValues method] // store separately using the given method
I'm not sold on it or anything... just throwing out ideas.
I like the separate param for "disk"/"memory" or "direct"/"memory" - the
default access method for the field really is different from how it's stored.
But it seems like that should just be a default and one should be able to
access the field via direct or memory depending on the situation?
For simply adding additional return fields, direct seems the right approach,
unless it's already been loaded into memory, in which case it would be a nice
optimization to use that.
> 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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