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https://issues.apache.org/jira/browse/CASSANDRA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713242#action_12713242
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Jonathan Ellis commented on CASSANDRA-48:
-----------------------------------------
... actually, thinking about it a little more, if you are using ZK locks for
consistency I don't really see the point of T&S at all. Read/write locks are
described under shared locks here:
http://zookeeper.wiki.sourceforge.net/ZooKeeperRecipes.
> 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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