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From "Jonathan Ellis (Created) (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-3442) TTL histogram for sstable metadata
Date Wed, 02 Nov 2011 03:36:32 GMT
TTL histogram for sstable metadata

                 Key: CASSANDRA-3442
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jonathan Ellis
            Priority: Minor

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.

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