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https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664511#action_12664511
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Michael McCandless commented on LUCENE-1314:
--------------------------------------------
{quote}
Changed DirectoryIndexReader. acquireWriteLock to throw an
UnsupportedOperationException (rather than a
LockObtainFailedException) when the reader is readonly because
TestIndexReader.testReadOnly was failing
{quote}
We can't really make that change -- it's technically a change to back compat.
Can we just fix the test that was failing (why was it failing?).
{quote}
Cloning a read only reader into a writeable reader throws an
exception.
{quote}
Why not allow this? (It shouldn't be hard to allow it?)
{quote}
Why does DirectoryIndexReader and SegmentReader have a readonly
variable?
{quote}
Hmm -- that's no good. Can you remove SegmentReader's?
> 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
>
>
> 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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