[ https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533172 ] 

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

Thanks all for the reviews and comments!

There seem to be some issues/open questions concerning the cloning. 
Before I comment on them I think it would make sense to decide whether
we want to stick with the cloning approach or not. Mike suggests this 
approach:

> Actually if we went back to the sharing (not cloning) approach, could
> we insert a check for any writing operation against the re-opened
> reader that throws an exception if the original reader is not yet
> closed?

Interesting, yes that should work in case we have two readers (the 
original one and the re-opened one). But what happens if the user calls 
reopen twice to get two re-opened instances back? Then there would be 
three instances, and without cloning the two re-opened ones would also 
share the same resources. Is this a desirable use case or would it be 
okay to restrict reopen() so that it can only create one new instance?

> 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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