Normalization Rule Generation and Implementation Systems and Methods

Product records having attributes according to various schema are normalized such that the attributes thereof conform to a canonical schema. Attributes for large numbers of product records are normalized according to a map-reduce framework in which mappers are defined but no reducers. Rules are implemented by a rule engine that is instantiated one time per VM of the map-reduce framework. Likewise, each rule may be implemented by only one object instance per rule engine instance. Generation of rules by analysts may be facilitated by defining an attribute hierarchy. A rule defined for a parent attribute may be presented as a default rule for a child attribute and either accepted or revised. Attributes may be clusters and proposed rules generated. Proposed rules may then be accepted or rejected by an analyst.