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https://issues.apache.org/jira/browse/CASSANDRA-3328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-3328:
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Attachment: 3328.txt
Testing this idea shows that I was wrong: there really aren't very many
non-overlapping compactions going on. In fact there is exactly one, the first
L0 to L1 compaction. I guess the skipLevels code is already doing a good job
of this for us.
> make leveled compaction suck less for insert-heavy workloads
> ------------------------------------------------------------
>
> Key: CASSANDRA-3328
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3328
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Priority: Minor
> Attachments: 3328.txt
>
>
> In insert-heavy workloads, leveled compaction needs to do a lot of
> "promotion" from one level to a higher one, where the higher level has no
> overlapping sstables. We can optimize a lot of these away by not bothering to
> rewrite sstables that are younger than GCGraceSeconds.
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