Exception: Randomness of hash of string should be disabled via PYTHONHASHSEED

Exception: Randomness of hash of string should be disabled via PYTHONHASHSEED

pyCharm执行程序执行到
movies_for_user = ratings.groupBy(lambda x:x.user).mapValues(list).lookup(789)
报错
Exception: Randomness of hash of string should be disabled via PYTHONHASHSEED

解决方法：

在运行py文件前加入环境变量如下：
os.environ[‘PYTHONHASHSEED’] = “123”

value值随便写即可
如果还不行，在spark配置文件spark-defaults.conf中加入：
spark.executorEnv.PYTHONHASHSEED=0
问题解决