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https://issues.apache.org/jira/browse/LUCENE-2468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868604#action_12868604
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Earwin Burrfoot commented on LUCENE-2468:
-----------------------------------------

Reusing fieldCacheKey is probably a good temporary solution? (possibly renaming 
it in the process to just cacheKey)
NRT.reopen() is not the only case when we're getting shallow clones, IR.clone() 
explicitly does that, so with cacheKey we're getting all the bases covered.

> reopen on NRT reader should share readers w/ unchanged segments
> ---------------------------------------------------------------
>
>                 Key: LUCENE-2468
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2468
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Yonik Seeley
>            Assignee: Michael McCandless
>         Attachments: LUCENE-2468.patch
>
>
> A repoen on an NRT reader doesn't seem to share readers for those segments 
> that are unchanged.
> http://search.lucidimagination.com/search/document/9f0335d480d2e637/nrt_and_caching_based_on_indexreader

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