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https://issues.apache.org/jira/browse/LUCENE-9404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17135473#comment-17135473
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Uwe Schindler commented on LUCENE-9404:
---------------------------------------

[~dweiss]: The Java 9 version is completely new, so in branch_8x we were not 
able to use it. Maybe that was the reason, we just forgot to update it for 
Lucene 9.

> simplify checksum calculation of ByteBuffersIndexOutput
> -------------------------------------------------------
>
>                 Key: LUCENE-9404
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9404
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Major
>         Attachments: LUCENE-9404.patch
>
>
> I think this class can avoid its current logic/copying and just call 
> CRC32.update(ByteBuffer) which is optimized for both array and direct buffers?



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