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https://issues.apache.org/jira/browse/LUCENE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728909#action_12728909
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Jason Rutherglen commented on LUCENE-1726:
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The test now passes, needs to go in the patch, perhaps in
TestIndexWriterReader? Great work on this, it's easier to
understand SegmentReader now that all the shared objects are in
one object (CoreReaders). It should make debugging go more
smoothly. 

Is there a reason we're not synchronizing on SR.core in
openDocStores? Couldn't we synchronize on core for the cloning
methods? 

> IndexWriter.readerPool create new segmentReader outside of sync block
> ---------------------------------------------------------------------
>
>                 Key: LUCENE-1726
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1726
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Assignee: Michael McCandless
>            Priority: Trivial
>             Fix For: 3.1
>
>         Attachments: LUCENE-1726.patch, LUCENE-1726.patch, LUCENE-1726.patch, 
> LUCENE-1726.patch, LUCENE-1726.patch, LUCENE-1726.trunk.test.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> I think we will want to do something like what field cache does
> with CreationPlaceholder for IndexWriter.readerPool. Otherwise
> we have the (I think somewhat problematic) issue of all other
> readerPool.get* methods waiting for an SR to warm.
> It would be good to implement this for 2.9.

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