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https://issues.apache.org/jira/browse/GIRAPH-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494135#comment-13494135
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Eli Reisman commented on GIRAPH-414:
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Yes! This makes me happy!
> Create BinaryCombiner ands specialized message store for it
> -----------------------------------------------------------
>
> Key: GIRAPH-414
> URL: https://issues.apache.org/jira/browse/GIRAPH-414
> Project: Giraph
> Issue Type: Improvement
> Reporter: Maja Kabiljo
> Assignee: Maja Kabiljo
>
> Current combiner interface is very general, but also doesn't provide the best
> performance. All the combiners we currently have are binary combiners, i.e.
> they can combine two messages into one. Having a lists around this simple
> concept makes it slower and requires more object creations.
> Adding BinaryCombiner, and a specialized message store which will be used
> with it. This message store has only one message per vertex instead of having
> a collection per vertex.
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