[
https://issues.apache.org/jira/browse/CASSANDRA-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuki Morishita updated CASSANDRA-3442:
--------------------------------------
Attachment: 3442.txt
Patch is against 1.0 branch. Added TTL histogram and logic to determine whether
to perform compaction over sstables that have expiring columns more than
threshold.
Threshold is default to 20% (0.2) but you can specify via
compaction_strategy_options.
> 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
> Attachments: 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
