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https://issues.apache.org/jira/browse/CASSANDRA-5366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607842#comment-13607842
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Brandon Williams commented on CASSANDRA-5366:
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I see, that makes sense.  We'll need a 'nodetool recompactall' or something 
similar to replace it, since occasionally upgradesstables has been used to do 
this for various reasons.
                
> UpgradeSSTables Optimisation
> ----------------------------
>
>                 Key: CASSANDRA-5366
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5366
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brooke Bryan
>
> 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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