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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3442) TTL histogram for sstable metadata
Date Tue, 28 Feb 2012 14:35:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218226#comment-13218226
] 

Jonathan Ellis commented on CASSANDRA-3442:
-------------------------------------------

Yes, I'm working on an updated patch.
                
> 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: 1.2
>
>         Attachments: cassandra-1.1-3442.txt
>
>
> 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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