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https://issues.apache.org/jira/browse/CASSANDRA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695461#action_12695461
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Jonathan Ellis commented on CASSANDRA-48:
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No, that's up to the client. It may wish to retry the write, or try to write
back the old value.
> 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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