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Posted to commits@cassandra.apache.org by "Yuki Morishita (Updated) (JIRA)" <ji...@apache.org> on 2012/02/09 20:09:59 UTC

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

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

Yuki Morishita updated CASSANDRA-3442:
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    Attachment:     (was: 3442.txt)
    
> 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
>             Fix For: 1.1.1
>
>
> 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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