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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104079#comment-13104079
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Jason Rutherglen commented on LUCENE-3433:
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This is somewhat funny, as it seems the opinion has changed on MMap'ing and the
potential for page faults:
http://www.lucidimagination.com/search/document/8951a336dffa9535/storing_and_loading_the_fst_directly_from_disk#8951a336dffa9535
> 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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