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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/12/13 16:26:12 UTC

[jira] [Created] (CASSANDRA-5062) Support CAS

Jonathan Ellis created CASSANDRA-5062:
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             Summary: 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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