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From "Arun Suresh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-10) Aggregators are not exported
Date Tue, 15 Nov 2011 07:39:52 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-10?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150283#comment-13150283
] 

Arun Suresh commented on GIRAPH-10:
-----------------------------------

Avery, I am assuming that a Vertex implemented by the user would have to implement this interface
if he requires his Aggregates to be persisted.. rite ? 

Firstly, I feel that Aggregrators MUST be persisted at the end of each superstep if the Vertex
has implemented AggregatorWriter. 

Secondly, the problem with exposing it as an interface I guess is.. Assume we have a default
AggregateWriter, how would the user include the default behavior in his custom vertex ?
I guess a better approach would be to let the user specify the AggregaterWriter class in the
Giraph JobConf and pass an instance of the class to methods in the BspServiceWorker class
like [~cmartella] mentioned in his comment.

With respect to writing Aggregators by type.. do you mean persisting a Map<AggregatorType,
List<Entry<String, Aggregator>>> for each job ?
                
> Aggregators are not exported
> ----------------------------
>
>                 Key: GIRAPH-10
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-10
>             Project: Giraph
>          Issue Type: New Feature
>            Reporter: Avery Ching
>            Priority: Minor
>
> Currently, aggregator values cannot be saved after a Giraph job.  There should be a way
to do this.

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