Abstract: Today, world is going to become more digital. As everyone using internet today, large amount of data gets generated every day. Every single person has his own account on different social sites, shopping sites, commercial sites. Billion kilobytes of data get generated every single day. This data may important for user. We need to store those data for future use. There is need to provide privacy and security to such data. Hadoop is used to store and analyse the data. There are different tools which research on the top of Hadoop stack to provide security to data. The motive of this study to provide review of existing privacy and security methods for Hadoop security.