maxData = sc.accumulator(0)
minData = sc.accumulator(0)
meanData = sc.accumulator(0)
totalData = sc.accumulator(0)

def countParallel(data):
    global maxData, minData, meanData, totalData
    maxData = data.max()
    minData = data.min()
    meanData = data.mean()
    totalData = data.count()
    return (maxData, minData, meanData, totalData)