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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104091#comment-13104091
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Robert Muir commented on LUCENE-3433:
-------------------------------------

no opinion has changed: traversing on disk automata in the way you describe is 
inefficient. 

here I describe accessing a fixed long value: 1 seek per access.

how many seeks will an fst lookup take? hint: its more than 1!

> 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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