[ https://issues.apache.org/jira/browse/CASSANDRA-5062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544010#comment-13544010 ]
Jonathan Ellis commented on CASSANDRA-5062: ------------------------------------------- It seems to me that the most promising approach is Spinnaker-style leader election, but we can use an algorithm like the one for native locking above to choose leaders instead of requiring ZK. > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira