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https://issues.apache.org/jira/browse/GIRAPH-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421904#comment-13421904
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Avery Ching commented on GIRAPH-266:
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+1, committed.
> 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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