[jira] [Commented] (LUCENE-3612) remove _X.fnx

["Uwe Schindler (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-3612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160467#comment-13160467 ] 

Uwe Schindler 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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