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https://issues.apache.org/jira/browse/LUCENE-9040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977663#comment-16977663
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Adrien Grand commented on LUCENE-9040:
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getGeneration sounds like the most trappy method on ReaderCommit indeed.
Documenting sounds like a good idea to me, maybe we should consider making it
throw an UOE on NRT readers.
> Questionable/Underspecified behavior of DirectoryReader.getIndexCommit() on
> NRT Readers
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-9040
> URL: https://issues.apache.org/jira/browse/LUCENE-9040
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Chris M. Hostetter
> Priority: Major
> Attachments: LUCENE-9040.patch
>
>
> It seems like DirectoryReader.getIndexCommit() returns weird
> results when using a "reopened" reader off of uncommited IW changes.
> Even though 2 diff readers will expose diff views of the index, they will
> claim to refer to the same IndexCommit (generation).
> Original email thread (no replies):
> http://mail-archives.apache.org/mod_mbox/lucene-dev/201910.mbox/%3Calpine.DEB.2.21.1910301611190.8171%40slate%3E
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