How do I validate customArguments?
Hi again. My application needs to pass in a String argument to the computation which each Vertex needs access to. (The argument is a list of the form [item1, item2, ...].) I found --customArguments (which I set in my tests via conf.set(arg_name, arg_val)) but I need to check that it's properly formatted. Where do I do that? The only thing I thought of is to specify a DefaultMasterCompute subclass whose initialize() does the check, but all the initialize() examples do is register aggregators; none of them check args or do anything else. Thanks in advance! -- matt -- Matthew Cornell | m...@matthewcornell.org | 413-626-3621 | 34 Dickinson Street, Amherst MA 01002 | matthewcornell.org
Which is better to use to manage Vertex state: POJO instance variables or Giraph values?
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 -- Matthew Cornell | m...@matthewcornell.org | 413-626-3621 | 34 Dickinson Street, Amherst MA 01002 | matthewcornell.org
