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https://issues.apache.org/jira/browse/LUCENE-5434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891108#comment-13891108
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Mark Miller commented on LUCENE-5434:
-------------------------------------

My first thought on this was that since it was not needed by windows or unix, 
it could be optional. My second thought was that it doesn't really change 
anything for windows or unix either - the deletes will happen at roughly 
equivalent times. Perhaps this is just a better way to handle deletion file 
references in general.

> Let NRT Readers prevent their files from being removed.
> -------------------------------------------------------
>
>                 Key: LUCENE-5434
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5434
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Mark Miller
>             Fix For: 5.0, 4.7
>
>
> See SOLR-5693 and our HDFS support - for something like HDFS to work with 
> NRT, we need an ability for near realtime readers to hold references to their 
> files to prevent deletes.



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