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Posted to commits@cassandra.apache.org by "Jonathan Ellis (Assigned) (JIRA)" <ji...@apache.org> on 2011/11/02 04:38:32 UTC

[jira] [Assigned] (CASSANDRA-3442) TTL histogram for sstable metadata

     [ https://issues.apache.org/jira/browse/CASSANDRA-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis reassigned CASSANDRA-3442:
-----------------------------------------

    Assignee: Sylvain Lebresne

Sylvain, what do you think of this idea?  (If it has merit, we can assign to Yuki for implementation.)
                
> 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: Sylvain Lebresne
>            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.

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