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https://issues.apache.org/jira/browse/CASSANDRA-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203617#comment-13203617
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Jonathan Ellis commented on CASSANDRA-3869:
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bq. messagedigest uses ByteBuffer.get for these
Right, it uses the "destructive" get which is why we need the duplication.
> [patch] don't duplicate ByteBuffers when hashing
> ------------------------------------------------
>
> Key: CASSANDRA-3869
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3869
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Dave Brosius
> Attachments: dont_dup_bb_for_hash.diff, dont_dup_bb_for_hash2.diff
>
>
> given how often hashing of ByteBuffers occurs, don't duplicate the ByteBuffer
> when hashing. (trivial - as the byte array was never copied just the BB
> wrapper -- but still).
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