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https://issues.apache.org/jira/browse/GIRAPH-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408191#comment-13408191
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Jan van der Lugt commented on GIRAPH-240:
-----------------------------------------
I agree that NullWritable should be used for vertices without a value. The
vertex id, however, should never be null or nullwritable, right? I think Giraph
would crash in that case, since it uses those ids internally.
> Our vertices shouldn't accept null ids or values
> ------------------------------------------------
>
> Key: GIRAPH-240
> URL: https://issues.apache.org/jira/browse/GIRAPH-240
> Project: Giraph
> Issue Type: Bug
> Components: graph
> Reporter: Alessandro Presta
>
> I may be missing something, but I don't understand why HashMapVertex and
> EdgeListVertex (and possibly others) check for null vertexId and vertexValue
> instead of complaining.
> Shouldn't each vertex be forced to have an id and a value? It's a source of
> potential bugs (see the serialization code that has to check for null and
> read/write a boolean flag) and I don't see the logic.
> If one doesn't want vertex/edge values at all there's always NullWritable.
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