[jira] [Created] (LUCENE-8324) Unreferenced files of dropped segments should be released

["Nhat Nguyen (JIRA)" <ji...@apache.org>]

Nhat Nguyen created LUCENE-8324:
-----------------------------------

             Summary: 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
         Attachments: 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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