Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@cassandra.apache.org
Date: Thu, 19 Jul 2012 23:13:34 +0000 (UTC)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <467907681.79209.1342739614927.JavaMail.jiratomcat@issues-vm>
In-Reply-To: 
 <1980875938.245.1328478839174.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Commented] (CASSANDRA-3855) RemoveDeleted dominates
 compaction time for large sstable counts
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/CASSANDRA-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418775#comment-13418775 ] 

Jonathan Ellis commented on CASSANDRA-3855:
-------------------------------------------

That's definitely wrong...  I think it should be {{if (info != LIVE) return false}}
                
> 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: 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira