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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467776#comment-13467776
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Sylvain Lebresne commented on CASSANDRA-3974:
---------------------------------------------

Sorry, I've forgot about that one, so the patch needs rebasing. But from a 
cursory inspection, v5 looks ok (except maybe for the M/R support Jeremy 
suggested above (but I'm not sure where's the best place to add that)).

Also, CASSANDRA-3442 adds info that should help use optimize things by dropping 
fully expired sstables, but I'm not sure the optimization itself is implemented 
yet. Do we want to do that in this ticket or should we move that to later (I'm 
good either way)?
                
> Per-CF TTL
> ----------
>
>                 Key: CASSANDRA-3974
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3974
>             Project: Cassandra
>          Issue Type: New Feature
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Jonathan Ellis
>            Assignee: Kirk True
>            Priority: Minor
>             Fix For: 1.2.0
>
>         Attachments: trunk-3974.txt, trunk-3974v2.txt, trunk-3974v3.txt, 
> trunk-3974v4.txt, trunk-3974v5.txt
>
>
> Per-CF TTL would allow compaction optimizations ("drop an entire sstable's 
> worth of expired data") that we can't do with per-column.

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