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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258846#comment-13258846
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Jonathan Ellis commented on CASSANDRA-3974:
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I mean, a CF ttl of X is useful only if it lets us reason that an sstable
written more than X seconds ago is entirely expired. So... min? :)
Is describe caching the schema as in CASSANDRA-4052?
Agreed that if we want to allow altering CF ttl, keeping it separate from
column ttl until we need to check for expired-ness makes the most sense.
> Per-CF TTL
> ----------
>
> Key: CASSANDRA-3974
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3974
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jonathan Ellis
> Assignee: Kirk True
> Priority: Minor
> Fix For: 1.2
>
> Attachments: trunk-3974.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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