[jira] [Updated] (GIRAPH-124) Combiner should return Iterable instead of M or null.

["Claudio Martella (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GIRAPH-124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claudio Martella updated GIRAPH-124:
------------------------------------

    Attachment: GIRAPH-124.diff

Implements the Iterable<M> interface on the return value. Throwing IllegalStateException when returned number of elements is >= the number of original messages.
                
> 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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