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https://issues.apache.org/jira/browse/LUCENE-8324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16482797#comment-16482797
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Michael McCandless commented on LUCENE-8324:
--------------------------------------------

+1

> Unreferenced files of dropped segments should be released
> ---------------------------------------------------------
>
>                 Key: LUCENE-8324
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8324
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 7.4, master (8.0)
>            Reporter: Nhat Nguyen
>            Priority: Major
>         Attachments: LUCENE-8324.patch, release-files.patch
>
>
> {quote} This has the side-effect that flushed segments that are 100% hard 
> deleted are also
> cleaned up right after they are flushed, previously these segments were 
> sticking
> around for a while until they got picked for a merge or received another 
> delete.{quote}
>  
> Since LUCENE-8253, a fully deleted segment is dropped immediately when it's 
> flushed, however, its files might be kept around even after a commit. In 
> other words, we may have unreferenced files which are retained by Deleter.
> I am not entirely sure if we should fix this but it's nice to have a 
> consistent content between current files and commit points as before.
> I attached a failed test for this.
> /cc [~simonw]



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