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https://issues.apache.org/jira/browse/GIRAPH-273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446231#comment-13446231
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Avery Ching commented on GIRAPH-273:
------------------------------------

One extra connection per worker should definitely be fine.  I want to note that 
we while distributed aggregators solves the issue of having a master be a 
single point of contention (and memory), we can still implement a tree based 
solution on top of that.  One does not preclude the other.  
                
> 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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