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https://issues.apache.org/jira/browse/LUCENE-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062475#comment-14062475
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Uwe Schindler commented on LUCENE-5681:
---------------------------------------

This improvement is especially important for slices of NRTCachingDirectory, 
because it uses RAMDirectory internally, too!

> Fix RAMDirectory's IndexInput to not double-buffer on slice()
> -------------------------------------------------------------
>
>                 Key: LUCENE-5681
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5681
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/store
>            Reporter: Uwe Schindler
>             Fix For: 5.0
>
>         Attachments: LUCENE-5681.patch
>
>
> After LUCENE-4371, we still have a non-optimal implementation of 
> IndexInput#slice() in RAMDirectory. We should fix that to use the cloning 
> approach like other directories do



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