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From "Gianmarco De Francisci Morales (JIRA)" <>
Subject [jira] [Commented] (GIRAPH-266) Average aggregators don't calculate real average
Date Tue, 24 Jul 2012 17:53:34 GMT


Gianmarco De Francisci Morales commented on GIRAPH-266:

Average is not an associative operation, so I would not support it directly in aggregators.
So I am also in favor of option 1.
Option 3 sounds over-engineered to me, however there might be use cases where one wants to
aggregate complex values, so it might have some value in the long run.
> Average aggregators don't calculate real average
> ------------------------------------------------
>                 Key: GIRAPH-266
>                 URL:
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
> 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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