def reducer_cmd(self):
        raise NotImplementedError
Change the target pool size. If we have too many connections already,
dataset/ETHPy150Open Yelp/mrjob/mrjob/job.py/MRJob.reducer_cmd--crossover with--dataset/ETHPy150Open driftx/Telephus/telephus/pool.py/CassandraClusterPool.adjustPoolSize