mesos/spark — pull request #175 by squito (2012-08-17 23:02:34+00:00)
Title: add accumulators for mutable collections, with correct typing!

add accumulator params for all "mutable collection" types (anything that is growable and traversable).

Rather than create a bunch of implicit objects, there is a helper method which just creates the AccumulableParam needed. This way, you also get correct typing of the accumulator. This does require a different method, though -- I called it accumulableCollection, not really tied to that name.

(this is completely independent from the other pull request on accumulable.localValue)