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Posted to commits@cassandra.apache.org by "Yuki Morishita (Commented) (JIRA)" <ji...@apache.org> on 2012/02/10 20:00:59 UTC
[jira] [Commented] (CASSANDRA-3442) TTL histogram for sstable
metadata
[ https://issues.apache.org/jira/browse/CASSANDRA-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205640#comment-13205640 ]
Yuki Morishita commented on CASSANDRA-3442:
-------------------------------------------
Patch also can apply to trunk at this moment.
> 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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