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From "Sylvain Lebresne (Assigned) (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-3855) RemoveDeleted dominates compaction time for large sstable counts
Date Sun, 05 Feb 2012 22:05:59 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne reassigned CASSANDRA-3855:
-------------------------------------------

    Assignee: Sylvain Lebresne
    
> 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
>            Reporter: Stu Hood
>            Assignee: Sylvain Lebresne
>            Priority: Critical
>              Labels: compaction, deletes, leveled
>         Attachments: 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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