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https://issues.apache.org/jira/browse/GIRAPH-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191510#comment-13191510
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Hudson commented on GIRAPH-124:
-------------------------------

Integrated in Giraph-trunk-Commit #65 (See 
[https://builds.apache.org/job/Giraph-trunk-Commit/65/])
    GIRAPH-124: Combiner should return Iterable<M> instead of M or null.

claudio : 
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1234997
Files : 
* /incubator/giraph/trunk/CHANGELOG
* 
/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/BasicRPCCommunications.java
* 
/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/MinimumIntCombiner.java
* 
/incubator/giraph/trunk/src/main/java/org/apache/giraph/examples/SimpleSumCombiner.java
* 
/incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/VertexCombiner.java
* /incubator/giraph/trunk/src/test/java/org/apache/giraph/TestVertexTypes.java
* 
/incubator/giraph/trunk/src/test/java/org/apache/giraph/examples/MinimumIntCombinerTest.java

                
> 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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