Cloud computing is a revolutionary computing approach, which provides massive storage and computational capability. Cloud computing is a computing paradigm which enables flexible, on-demand and low cost usage of resources. These advantage, are the causes of privacy and security issues, which arises because data owned by different users are stored in cloud servers instead of under their own control. This paper introduces data anonymization technique to hide sensitive data to avoid risk. The proposed method is generalized method data anonymization using MapReduce on cloud.