Within Policytool there are a couple of conventions implemented.
Our setup is fully Hive focused. We assume that we have no processing outside hive. Hence, we have implemented policytool to support Hive as a first hand citizens.
We have found it useful to have several environments within one cluster. Environments can be dev, test and prod for development, testing and production respectively. This is controlled by suffix all databases/schemas with underscore environment. For instance if we have the database data_lake. In our Hadoop and Hive setup we have three databases data_lake_dev, data_lake_test and data_lake_prod.
We have divided our data warehouse into projects. Each with its own name. One project owns a set of tables in one or several databases. In Policytool we use project-name to name our Ranger rules. This way we avoid conflicting naming of rules from different projects.