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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 12:43:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424825#comment-13424825
] 

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

We can provide two options to the user:
1. Use standard Netty messaging between workers and master to send aggregated values.
2. Master writes aggregated values to HDFS. User should use this option if his aggregated
values are very large objects.
                
> 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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