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From "Maja Kabiljo (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (GIRAPH-266) Average aggregators don't calculate real average
Date Tue, 24 Jul 2012 22:25:34 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Maja Kabiljo updated GIRAPH-266:
--------------------------------

    Attachment: GIRAPH-266.patch

Uploading a patch which removes average aggregators. If someone in the future has a need for
3. I can implement it.
                
> Average aggregators don't calculate real average
> ------------------------------------------------
>
>                 Key: GIRAPH-266
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-266
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
>         Attachments: GIRAPH-266.patch
>
>
> Average aggregators calculate average on workers, and then workers' averages are sent
to the master, where we actually calculate the average of averages. 
> For example, if one worker aggregates value 2, the other values 4 and 6, and third values
8, 8 and 8, we'll get the result of 5 instead of 6.

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