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https://issues.apache.org/jira/browse/CASSANDRA-5062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13531113#comment-13531113
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Jonathan Ellis commented on CASSANDRA-5062:
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One part I don't have a good answer to yet: how do you deal with timeouts in
lock-based CAS after the lock succeeds? That is: I acquire the lock, write my
new user record, but that write times out. Remember that this means "write is
in progress," not "write has failed," but an in-progress write might well not
yet be visible for another client that also tries to CAS.
> 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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