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https://issues.apache.org/jira/browse/CASSANDRA-8085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14382165#comment-14382165
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Tyler Hobbs commented on CASSANDRA-8085:
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Is there a reason we shouldn't backport this to 2.0? It looks like [~tjake]
set the fixver to 2.1 -- any particular reason for doing that?
> Make PasswordAuthenticator number of hashing rounds configurable
> ----------------------------------------------------------------
>
> Key: CASSANDRA-8085
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8085
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Sam Tunnicliffe
> Fix For: 3.0, 2.1.4
>
> Attachments: 8085-2.1.txt, 8085-3.0.txt
>
>
> Running 2^10 rounds of bcrypt can take a while. In environments (like PHP)
> where connections are not typically long-lived, authenticating can add
> substantial overhead. On IRC, one user saw the time to connect,
> authenticate, and execute a query jump from 5ms to 150ms with authentication
> enabled ([debug logs|http://pastebin.com/bSUufbr0]).
> CASSANDRA-7715 is a more complete fix for this, but in the meantime (and even
> after 7715), this is a good option.
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