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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3234) LeveledCompaction has several performance problems
Date Wed, 21 Sep 2011 15:49:09 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-3234:
--------------------------------------

    Attachment:     (was: 0003-fix-leveled-BF-size-calculation.txt)

> LeveledCompaction has several performance problems
> --------------------------------------------------
>
>                 Key: CASSANDRA-3234
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3234
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.0.0
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 1.0.0
>
>
> Two main problems:
> - BF size calculation doesn't take into account LCS breaking the output apart into "bite
sized" sstables, so memory use is much higher than predicted
> - ManyToMany merging is slow.  At least part of this is from running the full reducer
machinery against single input sources, which can be optimized away.

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