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https://issues.apache.org/jira/browse/LUCENE-5586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965101#comment-13965101
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Uwe Schindler commented on LUCENE-5586:
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OK, that's fine!
I don't think this causes bugs at the moment, but it prevents misuse.
> BufferedChecksumIndexInput is not cloneable
> -------------------------------------------
>
> Key: LUCENE-5586
> URL: https://issues.apache.org/jira/browse/LUCENE-5586
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.8
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5586.patch
>
>
> {{BufferedChecksumIndexInput}} implements {{Cloneable}}, yet its close method
> would return a shallow copy that still wraps the same {{IndexInput}} and
> {{Checksum}}. This is trappy, because reading on the clone would also read on
> the original instance and update the checksum.
> Since {{Checksum}} are not cloneable, I think {{ChecksumIndexInput.clone}}
> should just throw an UOE.
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