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https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535753
 ] 

Michael Busch commented on LUCENE-743:
--------------------------------------

{quote}
How about just defining the behavior such that any pending changes are flushed. 
That would make it more useful because you could then reopen readers you used 
for deletes.
{quote}

Hmm, I'm not sure I understand. A reader which is being used for deletes or 
setting norms is always current (it owns the write lock), so there should never 
be the need to re-open such a reader.

However, if you re-open an existing reader which was not used for deletes 
before and use the new instance (b) to perform deletes, it will result in a 
undefined behavior for the old reader (a):

{code:java}
IndexReader a = .....
....
IndexReader b = a.reopen();
b.deleteDocument(...);
{code}

> IndexReader.reopen()
> --------------------
>
>                 Key: LUCENE-743
>                 URL: https://issues.apache.org/jira/browse/LUCENE-743
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Otis Gospodnetic
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: IndexReaderUtils.java, lucene-743-take2.patch, 
> lucene-743.patch, lucene-743.patch, lucene-743.patch, MyMultiReader.java, 
> MySegmentReader.java, varient-no-isCloneSupported.BROKEN.patch
>
>
> This is Robert Engels' implementation of IndexReader.reopen() functionality, 
> as a set of 3 new classes (this was easier for him to implement, but should 
> probably be folded into the core, if this looks good).

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