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https://issues.apache.org/jira/browse/LUCENE-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491097#comment-13491097
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Robert Muir commented on LUCENE-4539:
-------------------------------------

When are packed ints in their own file today?
                
> DocValues impls should read all headers up-front instead of per-directsource
> ----------------------------------------------------------------------------
>
>                 Key: LUCENE-4539
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4539
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>            Reporter: Robert Muir
>         Attachments: LUCENE-4539.patch
>
>
> Currently, when DocValues opens, it just opens files. it doesnt read codec 
> headers etc.
> Instead we read these every single time a directsource opens. 
> I think it should work like PostingsReaders: e.g. the PackedInts impl would 
> read its versioning info and codec headers and creating a new Direct impl 
> should be a IndexInput.clone() + getDirectReaderNoHeader().
> Today its much more costly.

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