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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3974) Per-CF TTL
Date Sat, 21 Apr 2012 12:28:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258846#comment-13258846
] 

Jonathan Ellis commented on CASSANDRA-3974:
-------------------------------------------

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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