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https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673415#action_12673415
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Michael McCandless commented on LUCENE-1314:
--------------------------------------------
{quote}
For realtime there is a use case where a Multi*Reader needs to be
cloned without (re)opening the new segments.
{quote}
I thought that's exactly what clone does (does not open the segments_N)?
{quote}
This is due to running
IW.addIndexes in a backbround thread where upon completion a
concurrent IR.clone could unintentionally open the new segments.
{quote}
If IW is opened with autoCommit false, then even on completely of addIndexes,
a newly [re-]opened reader won't see the change, until IW commits?
> IndexReader.clone
> -----------------
>
> Key: LUCENE-1314
> URL: https://issues.apache.org/jira/browse/LUCENE-1314
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch,
> LUCENE-1314.patch, LUCENE-1314.patch, LUCENE-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch,
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch
>
>
> Based on discussion
> http://www.nabble.com/IndexReader.reopen-issue-td18070256.html. The problem
> is reopen returns the same reader if there are no changes, so if docs are
> deleted from the new reader, they are also reflected in the previous reader
> which is not always desired behavior.
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