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https://issues.apache.org/jira/browse/CASSANDRA-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuki Morishita updated CASSANDRA-3855:
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Attachment: 3855.txt
So I summarized and attached patch. Tested on trunk and confirmed it fixed.
> RemoveDeleted dominates compaction time for large sstable counts
> ----------------------------------------------------------------
>
> Key: CASSANDRA-3855
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3855
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.1.0
> Reporter: Stu Hood
> Assignee: Yuki Morishita
> Labels: compaction, deletes, leveled
> Attachments: 3855.txt, with-cleaning-java.hprof.txt
>
>
> With very large numbers of sstables (2000+ generated by a `bin/stress -n
> 100,000,000` run with LeveledCompactionStrategy),
> PrecompactedRow.removeDeletedAndOldShards dominates compaction runtime, such
> that commenting it out takes compaction throughput from 200KB/s to 12MB/s.
> Stack attached.
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