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https://issues.apache.org/jira/browse/CASSANDRA-4947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496866#comment-13496866
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Edward Capriolo commented on CASSANDRA-4947:
--------------------------------------------

-1 there are people out there using different conventions. 

http://wiki.apache.org/cassandra/DataModel
Timestamps can be anything you like, but microseconds since 1970 is a 
convention. Whatever you use, it must be consistent across the application, 
otherwise earlier changes may overwrite newer ones. 

You can't unring a bell.  
                
> Disallow client-provided timestamps in cql3
> -------------------------------------------
>
>                 Key: CASSANDRA-4947
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4947
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>            Reporter: Jonathan Ellis
>            Priority: Blocker
>             Fix For: 1.2.0
>
>
> Client-provided timestamps cause a lot of pain since we can't make any 
> assumptions as to client:server clock agreement.  Is this worth the pain?  If 
> not we should rip out {{WITH TIMESTAMP}} before 1.2.0. 

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