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https://issues.apache.org/jira/browse/LUCENE-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727843#action_12727843
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Michael McCandless commented on LUCENE-1726:
--------------------------------------------

Yes, we should eventually see a failure; I think it's just rare.  Maybe try 
making a new test that constantly indexes docs, w/ low merge factor & 
maxBufferedDocs (so lots of flushing/merging happens) in one thread and 
constantly opens an NRT reader in another thread, to tease it out?

> 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
>
>   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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