Combiner should return Iterable<M> instead of M or null.
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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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