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From "Sylvain Lebresne (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3666) Changing compaction strategy from Leveled to SizeTiered logs millions of messages about nothing to compact
Date Tue, 03 Jan 2012 14:46:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13178755#comment-13178755
] 

Sylvain Lebresne commented on CASSANDRA-3666:
---------------------------------------------

+1 on the patch (but we can wait on Viktor to confirm it does fix it for him).

(I actually think that it's the settings of the threshold in LCS that is the ugly part, but
let's not bother with that)
                
> Changing compaction strategy from Leveled to SizeTiered logs millions of messages about
nothing to compact
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3666
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3666
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>         Environment: Windows Server 2008 R2 64bit
>            Reporter: Viktor Jevdokimov
>            Assignee: Jonathan Ellis
>              Labels: compaction
>             Fix For: 1.0.7
>
>         Attachments: 3666.txt
>
>
> When column family compaction strategy is changed from Leveled to SizeTiered and there're
Leveled compaction tasks pending, Cassandra starting to flood in logs with thousands per sec
messages:
> Nothing to compact in ColumnFamily1.  Use forceUserDefinedCompaction if you wish to force
compaction of single sstables (e.g. for tombstone collection)
> As a result, log disk is full and system is down.

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