Jake Mannix commented on GIRAPH-36:

In fact, thinking about VertexReader further, it seems its entire API is a 
little backwards.  Why are we *passing in* instantiated Vertices, and filling 
them in?  Shouldn't they effectively be "iterators" over the InputSplit?

> Ensure that subclassing BasicVertex is possible by user apps
> ------------------------------------------------------------
>                 Key: GIRAPH-36
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-36
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.70.0
>            Reporter: Jake Mannix
>            Assignee: Jake Mannix
>            Priority: Blocker
>             Fix For: 0.70.0
> Original assumptions in Giraph were that all users would subclass Vertex 
> (which extended MutableVertex extended BasicVertex).  Classes which wish to 
> have application specific data structures (ie. not a TreeMap<I, Edge<I,E>>) 
> may need to extend either MutableVertex or BasicVertex.  Unfortunately 
> VertexRange extends ArrayList<Vertex>, and there are other places where the 
> assumption is that vertex classes are either Vertex, or at least 
> MutableVertex.
> Let's make sure the internal APIs allow for BasicVertex to be the base class.

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