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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258685#comment-13258685
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Kirk True commented on CASSANDRA-3974:
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There are a few pieces missing yet:
# The ability to alter a column family to change the default TTL option.
Because I made the change to use max(column TTL, CF TTL) at column mutate time,
altering the column family default TTL value will be "lost" on such columns.
# I'm fighting with Python to understand why 'DESCRIBE COLUMNFAMILY FOO'
doesn't show the new default TTL value. I made the change in the Python and
Java layers to accept this new option, but the describe fails to display it.
> 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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