Is there a recommended rules engine for Hadoop? Has anyone tested Drool with Hive?

[#1]

Is there a recommended rules engine for Hadoop? Has anyone tested Drool with Hive and/or Spark?

The idea is to have a repository of rules, and the engine should read the rules and apply them to the data. These rules could be simple (e.g. value >10) or complex (e.g. average age is 40% greater than the standard deviation of the population). I know that I can write these rules manually in HIVE, but we would like to let the end users make changes on the rules without having us re-write the rule.

[#2]

Any responses received for this?