Claudio Martella commented on GIRAPH-124:

1) Weird... I'll take a look at it.
2) To be honest I didn't remember what we had agreed exactly, but <= sounds 
> 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
> 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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