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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427343#comment-13427343
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Sylvain Lebresne commented on CASSANDRA-3974:
---------------------------------------------
Well, if the goal is just to be able to drop entire sstables when we know
everything is expired, we could compute and keep in the metadata the min TTL of
the sstable.
> 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
> Reporter: Jonathan Ellis
> Assignee: Kirk True
> Priority: Minor
> Fix For: 1.2
>
> Attachments: trunk-3974.txt, trunk-3974v2.txt, trunk-3974v3.txt,
> trunk-3974v4.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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