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From "Maja Kabiljo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-273) Aggregators shouldn't use Zookeeper
Date Mon, 30 Jul 2012 16:23:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424964#comment-13424964
] 

Maja Kabiljo commented on GIRAPH-273:
-------------------------------------

It seems Pregel already does tree based reduction - from Pregel paper:
"At the end of the superstep workers form a tree to reduce partially reduced aggregators into
global values and deliver them to the master."
                
> Aggregators shouldn't use Zookeeper
> -----------------------------------
>
>                 Key: GIRAPH-273
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-273
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
>
> We use Zookeeper znodes to transfer aggregated values from workers to master and back.
Zookeeper is supposed to be used for coordination, and it also has a memory limit which prevents
users from having aggregators with large value objects. These are the reasons why we should
implement aggregators gathering and distribution in a different way.

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