cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-8329) LeveledCompactionStrategy should split large files across data directories when compacting
Date Tue, 18 Nov 2014 10:06:34 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcus Eriksson updated CASSANDRA-8329:
---------------------------------------
    Attachment: 0001-get-new-sstable-directory-for-every-new-file-during-.patch

Attaching patch that gets a new directory for every new file during compaction.

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message