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https://issues.apache.org/jira/browse/CASSANDRA-5831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-5831:
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      Component/s: Tools
         Priority: Minor  (was: Major)
    Fix Version/s: 1.2.9
         Assignee: Tyler Hobbs

I think all we need to do here is "don't run upgradesstables if the ks/cf/ 
heirarchy doesn't exist already for the system tables."

In particular, upgradesstables against a 1.1 install should be fine.
                
> Running sstableupgrade on C* 1.0 data dir, before starting C* 1.2 for the 
> first time breaks stuff
> -------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5831
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5831
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Jeremiah Jordan
>            Assignee: Tyler Hobbs
>            Priority: Minor
>             Fix For: 1.2.9
>
>
> If you try to upgrade from C* 1.0.X to 1.2.X and run offline sstableupgrade 
> to try and migrate the sstables before starting 1.2.X for the first time, it 
> messes up the system folder, because it doesn't migrate it right, and then C* 
> 1.2 can't start.
> sstableupgrade should either refuse to run against a C* 1.0 data folder, or 
> migrate stuff the right way.

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