def reduce(self, function, initializer, target = 'keys'):
# target = 'keys': reduce across keys
# target = 'values': reduce across values
intermediate_results = []
encoded_func = util.encode_function(function)
for num in range(self.hash_grain):
try:
assignment = self.worker_assignment[num]
except KeyError:
self.execute()
proxy = xmlrpclib.ServerProxy(self.worker_assignment[num].uri)
args = util.pds(self.uid, num, encoded_func, initializer, target)
intermediate_result = proxy.worker_reduce(args)
intermediate_results.append(intermediate_result)
return reduce(function, intermediate_results, initializer)