Which is better to use to manage Vertex state: POJO instance variables or Giraph values?

[Matthew Cornell <ma...@matthewcornell.org>]

Hi there. I'm confused about when it's OK to use Vertex instance variables
to maintain state rather than proper Giraph values ala getValue(). An
interesting example I found in the source demonstrates both:
SimpleTriangleClosingVertex, which has both an instance variable (closeMap)
and a custom vertex value (IntArrayListWritable). I'm a little surprised
that using an instance variable is legit due to possibly screwing up
serialization (?) My question: Is either valid? If so, how do I choose one
over the other? Thanks very much. -- matt

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