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From "Robert Muir (Created) (JIRA)" <>
Subject [jira] [Created] (LUCENE-3612) remove _X.fnx
Date Wed, 30 Nov 2011 21:27:40 GMT
remove _X.fnx

                 Key: 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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