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https://issues.apache.org/jira/browse/CASSANDRA-5062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589771#comment-13589771
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Cristian Opris commented on CASSANDRA-5062:
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Jonathan, how do you plan fitting CAS into Paxos ? Paxos would give consensus,
but what would the consesus be on ? The value to write ?
Is the CAS run at each replica or just the proposer ? How do you make sure when
you run CAS locally you have actually learned the *previous* consensus value
(to compare expected with) ?
> Support CAS
> -----------
>
> Key: CASSANDRA-5062
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5062
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Reporter: Jonathan Ellis
> Fix For: 2.0
>
>
> "Strong" consistency is not enough to prevent race conditions. The classic
> example is user account creation: we want to ensure usernames are unique, so
> we only want to signal account creation success if nobody else has created
> the account yet. But naive read-then-write allows clients to race and both
> think they have a green light to create.
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