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https://issues.apache.org/jira/browse/LUCENE-5636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14004715#comment-14004715
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ASF subversion and git services commented on LUCENE-5636:
---------------------------------------------------------
Commit 1596582 from [~shaie] in branch 'dev/branches/branch_4x'
[ https://svn.apache.org/r1596582 ]
LUCENE-5618, LUCENE-5636: write each DocValues update in a separate file; stop
referencing old fieldInfos files
> SegmentCommitInfo continues to list unneeded gen'd files
> --------------------------------------------------------
>
> Key: LUCENE-5636
> URL: https://issues.apache.org/jira/browse/LUCENE-5636
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5636.patch
>
>
> I thought I handled it in LUCENE-5246, but turns out I didn't handle it
> fully. I'll upload a patch which improves the test to expose the bug. I know
> where it is, but I'm not sure how to fix it without breaking index
> back-compat. Can we do that on experimental features?
> The problem is that if you update different fields in different gens, the
> FieldInfos files of older gens remain referenced (still!!). I open a new
> issue since LUCENE-5246 is already resolved and released, so don't want to
> mess up our JIRA...
> The severity of the bug is that unneeded files are still referenced in the
> index. Everything still works correctly, it's just that .fnm files are still
> there. But as I wrote, I'm still not sure how to solve it without requiring
> apps that use dv updates to reindex.
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