Spark Security

默认用户获取：

1.system property:"user.name"

2.system env:"SPARK_USER"

3.UserGroupInformation.getCurrentUser().getShortUserName()

Spark security开关：

spark.authenticate：false

In YARN and local mode, generate a new secret and store it in the current user's credentials.UGI：“sparkCookie”

Others：Spark CONF >>>spark.authenticate.secret