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https://issues.apache.org/jira/browse/GIRAPH-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191431#comment-13191431
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Claudio Martella commented on GIRAPH-124:
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damn RB. it should be fixed now...
> Combiner should return Iterable<M> instead of M or null.
> --------------------------------------------------------
>
> Key: GIRAPH-124
> URL: https://issues.apache.org/jira/browse/GIRAPH-124
> Project: Giraph
> Issue Type: Improvement
> Components: graph
> Affects Versions: 0.1.0
> Reporter: Claudio Martella
> Attachments: GIRAPH-124.diff, GIRAPH-124.diff
>
>
> Currently VertexCombiner is expected to return a single message combining the
> input messages, or null in case no message should be sent. The new expected
> interface should return an Iterable<M>, possibly empty. The number of
> elements in the returned Iterable is supposed to be smaller than the number
> of input messages, by the initial definition of a Combiner (defined as a
> function to reduce I/O by combining multiple messages into 1).
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