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From "Jie Huang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CHUKWA-647) Spread out intermediate data with the same ReduceType into different Reduce Tasks
Date Mon, 16 Jul 2012 07:00:36 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jie Huang updated CHUKWA-647:
-----------------------------

    Attachment:     (was: Chukwa-647.patch)
    
> Spread out intermediate data with the same ReduceType into different Reduce Tasks
> ---------------------------------------------------------------------------------
>
>                 Key: CHUKWA-647
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-647
>             Project: Chukwa
>          Issue Type: Improvement
>          Components: Data Processors
>    Affects Versions: 0.4.0, 0.6.0
>            Reporter: Jie Huang
>            Priority: Minor
>         Attachments: Chukwa-647-0_4.patch
>
>
> We have found that if we partitioned the map output data according to ReduceType, we
can see the data skew in some HiTune cases. Then one or two Reduce Tasks slow down the whole
Demux job somehow, since those reduce tasks have to process more input-data.    

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