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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-48) test-and-set
Date Tue, 26 May 2009 20:39:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713237#action_12713237
] 

Jonathan Ellis commented on CASSANDRA-48:
-----------------------------------------

I'd like to get the "dial up consistency" part in first rather than the other way around,
since something like that (Zookeeper?) would be useful in other situations as well while T&S
w/o consistency is not really useful as you point out.

> 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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