@classmethod
  def find_by_mapreduce_state(cls, mapreduce_state):
    keys = cls.calculate_keys_by_mapreduce_state(mapreduce_state)
    return [state for state in db.get(keys) if state]
Find all shard states for given mapreduce.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/model.py/ShardState.find_by_mapreduce_state