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https://issues.apache.org/jira/browse/LUCENE-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057967#comment-13057967
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Simon Willnauer commented on LUCENE-3216:
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I will back out the config stuff and make it default to CFS. Somehow somebody
who needs it eventually will figure it out how to make it non-private whatever.
> Store DocValues per segment instead of per field
> ------------------------------------------------
>
> Key: LUCENE-3216
> URL: https://issues.apache.org/jira/browse/LUCENE-3216
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3216.patch, LUCENE-3216.patch, LUCENE-3216.patch,
> LUCENE-3216.patch, LUCENE-3216.patch, LUCENE-3216.patch,
> LUCENE-3216_floats.patch
>
>
> currently we are storing docvalues per field which results in at least one
> file per field that uses docvalues (or at most two per field per segment
> depending on the impl.). Yet, we should try to by default pack docvalues into
> a single file if possible. To enable this we need to hold all docvalues in
> memory during indexing and write them to disk once we flush a segment.
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