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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13278489#comment-13278489
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Jonathan Ellis commented on CASSANDRA-3974:
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RSVH still goes through getColumnFamily. It can either go through the index
AbstractScanIterator which calls getCF at line 195 in KeysSearcher, or the seq
scan iterator via CFS.filterColumnFamily (RowIteratorFactory line 111).
Remember that these only remove *expired* tombstones; non-expired ones need to
be returned to the coordinator for read repair.
> 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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