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https://issues.apache.org/jira/browse/LUCENE-2985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011245#comment-13011245
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Simon Willnauer commented on LUCENE-2985:
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I will commit this in a bit if nobody objects
> Build SegmentCodecs incrementally for consistent codecIDs during indexing
> -------------------------------------------------------------------------
>
> Key: LUCENE-2985
> URL: https://issues.apache.org/jira/browse/LUCENE-2985
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Codecs, Index
> Affects Versions: CSF branch, 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: CSF branch, 4.0
>
> Attachments: LUCENE-2985.patch, LUCENE-2985.patch
>
>
> currently we build the SegementCodecs during flush which is fine as long as
> no codec needs to know which fields it should handle. This will change with
> DocValues or when we expose StoredFields / TermVectors via Codec (see
> LUCENE-2621 or LUCENE-2935). The other downside it that we don't have a
> consistent view of which codec belongs to which field during indexing and all
> FieldInfo instances are unassigned (set to -1). Instead we should build the
> SegmentCodecs incrementally as fields come in so no matter when a codec needs
> to be selected to process a document / field we have the right codec ID
> assigned.
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