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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3855) RemoveDeleted dominates compaction time for large sstable counts
Date Fri, 20 Jul 2012 23:19:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419677#comment-13419677
] 

Hudson commented on CASSANDRA-3855:
-----------------------------------

Integrated in Cassandra #1734 (See [https://builds.apache.org/job/Cassandra/1734/])
    fix incorrect hasIrrelevantData result for live CF; patch by yukim, reviewed by jbellis/slebresne
for CASSANDRA-3855 (Revision d74103735126658d64cb92a16f4bb40f63d5e2e8)

     Result = ABORTED
yukim : 
Files : 
* src/java/org/apache/cassandra/db/AbstractColumnContainer.java

                
> 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
>             Fix For: 1.2
>
>         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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