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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104049#comment-13104049
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Robert Muir commented on LUCENE-3433:
-------------------------------------
Simon: I think it would be a really nice feature.
Imagine someone that has a large collection and maybe quite a few docvalues
fields:
it would be nice if you have a fixed int64 docvalues for it to just be a
mmap'ed readLong() for example.
I think in a lot of cases the memory resident random-access that we have now is
going to be great, e.g.
if someone wants to use it for a scoring factor and its going to be super-hot.
but in other more advanced cases (especially if you have many of them or access
is relatively infrequent)
it would be a nice option to have available where currently you have to deal
with the downsides of
'fake terms' with a payload or stored fields.
> Random access non RAM resident IndexDocValues (CSF)
> ---------------------------------------------------
>
> Key: LUCENE-3433
> URL: https://issues.apache.org/jira/browse/LUCENE-3433
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Fix For: 4.0
>
>
> There should be a way to get specific IndexDocValues by going through the
> Directory rather than loading all of the values into memory.
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