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https://issues.apache.org/jira/browse/LUCENE-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160689#comment-13160689
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Simon Willnauer commented on LUCENE-3612:
-----------------------------------------
+1
> remove _X.fnx
> -------------
>
> Key: LUCENE-3612
> URL: https://issues.apache.org/jira/browse/LUCENE-3612
> Project: Lucene - Java
> Issue Type: Task
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-3612.patch
>
>
> Currently we store a global (not per-segment) field number->name mapping in
> _X.fnx
> However, it doesn't actually save us any performance e.g on IndexWriter's
> init because
> since LUCENE-2984 we are to loading the fieldinfos anyway to compute files()
> for IFD, etc,
> as thats where hasProx/hasVectors is.
> Additionally in the past global files like shared doc stores have caused us
> problems,
> (recently we just fixed a bug related to this file in LUCENE-3601).
> Finally this is trouble for backwards compatibility as its difficult to
> handle a global
> file with the codecs mechanism.
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