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From "Marcos Chioratto Trama (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5604) Vnodes decrease Hadoop performances cause it creates too many small splits
Date Sun, 28 Jul 2013 00:05:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721805#comment-13721805
] 

Marcos Chioratto Trama commented on CASSANDRA-5604:
---------------------------------------------------

The issue causes vnodes * replicas tasks be started for each job, correct? Would be nice if
we have a parameter to specify the vnodes / task proportion. Example:
Vnodes: 256 (default)
Replicas: 3
Tasks started by Pig: 768
With proportion = 3 we would have only 768 / 3 = 256 tasks started, improving the performance.
This make sense?
                
> Vnodes decrease Hadoop performances cause it creates too many small splits
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5604
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5604
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 1.2.4
>         Environment: Linux Ubuntu 12.04 LTS x86_64
>            Reporter: Cyril Scetbon
>            Priority: Trivial
>


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