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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-266) Average aggregators don't calculate real average
Date Wed, 25 Jul 2012 00:55:35 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421907#comment-13421907
] 

Hudson commented on GIRAPH-266:
-------------------------------

Integrated in Giraph-trunk-Commit #151 (See [https://builds.apache.org/job/Giraph-trunk-Commit/151/])
    GIRAPH-266: Average aggregators don't calculate real average
(majakabiljo via aching). (Revision 1365372)

     Result = SUCCESS
aching : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1365372
Files : 
* /giraph/trunk/CHANGELOG
* /giraph/trunk/src/main/java/org/apache/giraph/aggregators/DoubleAverageAggregator.java
* /giraph/trunk/src/main/java/org/apache/giraph/aggregators/FloatAverageAggregator.java
* /giraph/trunk/src/test/java/org/apache/giraph/aggregators/TestDoubleAggregators.java
* /giraph/trunk/src/test/java/org/apache/giraph/aggregators/TestFloatAggregators.java

                
> 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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