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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 Wed, 19 Nov 2014 02:15:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217281#comment-14217281
] 

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

Let me know if I can help here. I'm already set up for my tests in #7386, so I can probably
test this one too. CC [~enigmacurry] unless #8316 has a higher priority.

> 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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