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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-273) Aggregators shouldn't use Zookeeper
Date Mon, 03 Sep 2012 21:36:07 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447414#comment-13447414
] 

Eli Reisman commented on GIRAPH-273:
------------------------------------

Wanted to add something: rereading the thread here, I think I can address the HDFS concern
from earlier: the NameNode unduly suffers when HDFS is loaded up with lots of tiny files.

                
> 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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