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https://issues.apache.org/jira/browse/CASSANDRA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695799#action_12695799
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Jun Rao commented on CASSANDRA-48:
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What are the version numbers set by the 2 updates? If the version numbers are 
the same, it's not clear if majority read helps since the conflict resolution 
logic is based on version number.

> test-and-set
> ------------
>
>                 Key: CASSANDRA-48
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-48
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>
> Atomic test-and-set insert operation would be nice: "set value to X but only 
> if the current value is still Y."  This allows a sort of optimistic 
> consistency: perform a GET, then perform test-and-set with the value of that 
> GET as Y.
> I do not think that this requires strong consistency to be useful.

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