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https://issues.apache.org/jira/browse/CASSANDRA-3794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194567#comment-13194567
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Peter Schuller commented on CASSANDRA-3794:
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Which I interpret as the cf id:s that are embedded in e.g. row mutations 
(remember all those "invalid cfId..." cases upon schema changes). In general, 
UUID:s should minimize the chances of accidentally applying something to the 
wrong CF (which I suppose is a generalization of the simultaneous creation case 
mentioned in the ticket description).

                
> Change ColumnFamily identifiers to be UUIDs instead of sequential Integers.
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3794
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3794
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Pavel Yaskevich
>            Assignee: Pavel Yaskevich
>            Priority: Minor
>             Fix For: 1.2
>
>
> Change ColumnFamily identifiers to be UUIDs instead of sequential Integers. 
> Would be useful in the situation when nodes simultaneously trying to create 
> ColumnFamilies.

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