MapReduce is being used for various data analytic applications.Based on our service engagement with enterprise customers, as well as the observation from the use of MapReduce in Web 2.0 companies, log processing emerges as an important type of data analysis commonly done with MapReduce. In log processing, a log of events, such as click-stream, log of phone call records or even a sequence of transactions, is continuously collected and stored in flat files. MapReduce is then used to compute various statistics and derive business insights from the data.