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From "Gianmarco De Francisci Morales (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-273) Aggregators shouldn't use Zookeeper
Date Tue, 31 Jul 2012 11:28:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425681#comment-13425681
] 

Gianmarco De Francisci Morales commented on GIRAPH-273:
-------------------------------------------------------

IMHO, even as an option it does not make much sense.
What is the advantage of persisting (and replicating) aggregators on disk?
Especially if they are many and small, HDFS is the worst place.
                
> 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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