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https://issues.apache.org/jira/browse/LUCENE-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558930#comment-14558930
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Uwe Schindler commented on LUCENE-6500:
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A second solution would be to give up on completely mirroring the whole nested
structure. We could simply create a ParallelCompositeReader with a
ParallelLeafReader for each leave(), leaving out all inner composites. This
would simplify the whole thing completely. There is (in my opinion) no reason
to not flatten the structure. The alignment of readers would still match.
> ParallelCompositeReader does not always call closed listeners
> -------------------------------------------------------------
>
> Key: LUCENE-6500
> URL: https://issues.apache.org/jira/browse/LUCENE-6500
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6500.patch
>
>
> CompositeParallelReader misses to call closed listeners when the reader which
> is provided at construction time does not wrap leaf readers directly, such as
> a multi reader over directory readers.
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