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