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From "Claudio Martella (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-124) Combiner should return Iterable<M> instead of M or null.
Date Tue, 17 Jan 2012 01:11:38 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13187352#comment-13187352
] 

Claudio Martella commented on GIRAPH-124:
-----------------------------------------

As discussed in mailing-list, there are two possible approaches on how to manage a returned
Iterable<M> with more messages than the input set: a warning in the logs or an exception.
We should take a decision about it.
                
> 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
>
> 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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