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From "Alan Boudreault (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8329) LeveledCompactionStrategy should split large files across data directories when compacting
Date Thu, 20 Nov 2014 13:08:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14219346#comment-14219346
] 

Alan Boudreault commented on CASSANDRA-8329:
--------------------------------------------

[~krummas] Is there a patch for cassandra 2.1? I assume that this issue affects also 2.1 and
master.

> LeveledCompactionStrategy should split large files across data directories when compacting
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8329
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8329
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: J.B. Langston
>            Assignee: Marcus Eriksson
>             Fix For: 2.0.12
>
>         Attachments: 0001-get-new-sstable-directory-for-every-new-file-during-.patch
>
>
> Because we fall back to STCS for L0 when LCS gets behind, the sstables in L0 can get
quite large during sustained periods of heavy writes.  This can result in large imbalances
between data volumes when using JBOD support.  
> Eventually these large files get broken up as L0 sstables are moved up into higher levels;
however, because LCS only chooses a single volume on which to write all of the sstables created
during a single compaction, the imbalance is persisted.



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