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Jonathan Ellis reassigned CASSANDRA-3442: ----------------------------------------- Assignee: Yuki Morishita (was: Sylvain Lebresne) We can get average column size from row size / column count, so we could make it "If column size > N bytes or sstable is older than gc_grace_period." > TTL histogram for sstable metadata > ---------------------------------- > > Key: CASSANDRA-3442 > URL: https://issues.apache.org/jira/browse/CASSANDRA-3442 > Project: Cassandra > Issue Type: Improvement > Components: Core > Reporter: Jonathan Ellis > Assignee: Yuki Morishita > Priority: Minor > Labels: compaction > > Under size-tiered compaction, you can generate large sstables that compact > infrequently. With expiring columns mixed in, we could waste a lot of space > in this situation. > If we kept a TTL EstimatedHistogram in the sstable metadata, we could do a > single-sstable compaction aginst sstables with over 20% (?) expired data. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira