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https://issues.apache.org/jira/browse/LUCENE-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491432#comment-13491432
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Adrien Grand commented on LUCENE-4539:
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Only in tests. This is why I think that writing a full header (including the
"PackedInts" codec name) is useless most of time if not always.
> 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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