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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3606) Make IndexReader really read-only in Lucene 4.0
Date Thu, 01 Dec 2011 00:31:41 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160515#comment-13160515
] 

Uwe Schindler commented on LUCENE-3606:
---------------------------------------

OK, I will work on this as soon as I can (next weekend). I will be gald to remove the copy-on-write
setNorm stuff in Lucene40 codec and make Lucene3x codec completely read-only (only reading
the newest norm file). I hope Robert will possibly help me :-)
                
> Make IndexReader really read-only in Lucene 4.0
> -----------------------------------------------
>
>                 Key: LUCENE-3606
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3606
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: core/index
>    Affects Versions: 4.0
>            Reporter: Uwe Schindler
>
> As we change API completely in Lucene 4.0 we are also free to remove read-write access
and commits from IndexReader. This code is so hairy and buggy (as investigated by Robert and
Mike today) when you work on SegmentReader level but forget to flush in the DirectoryReader,
so its better to really make IndexReaders readonly.
> Currently with IndexReader you can do things like:
> - delete/undelete Documents -> Can be done by with IndexWriter, too (using deleteByQuery)
> - change norms -> this is a bad idea in general, but when we remove norms at all and
replace by DocValues this is obsolete already. Changing DocValues should also be done using
IndexWriter in trunk (once it is ready)

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