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https://issues.apache.org/jira/browse/CASSANDRA-3442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuki Morishita updated CASSANDRA-3442:
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Attachment: cassandra-1.1-3442.txt
I modified the patch to perform single sstable compaction when nothing else can
be compacted.
I added new single_compaction_interval option which defaults to 24 hours in
order to prevent recursive compaction on the same sstable.
I also added unit test to CompactionsTest.
> 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
>
> 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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