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https://issues.apache.org/jira/browse/CASSANDRA-5366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne updated CASSANDRA-5366:
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    Attachment: 5366.txt

Attaching simple patch to change the default behavior (to skip current version 
sstables) and adding a flag to restore the old one.
                
> UpgradeSSTables Optimisation
> ----------------------------
>
>                 Key: CASSANDRA-5366
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5366
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brooke Bryan
>         Attachments: 5366.txt
>
>
> Currently, if you run upgradesstables, cassandra will run through every 
> single SSTable within the scope of the request.  Where we have some large 
> tables, an upgrade on a single sstable can take hours, even if its already 
> sat on the same version.
> After upgrading to a new cassandra version, it would be ideal to be able to 
> upgrade only sstables not sat in the latest version, as it seems like it just 
> needs to do a massive amount of disk IO, with nothing being achieved at the 
> end of it.
> Maybe its worth putting an option onto the nodetool command, or creating a 
> new command for this type of upgrade

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