Related InterviewSolutions

• If Reducers Do Not Start Before All Mappers Finish Then Why Does The Progress On Mapreduce Job Shows Something Like Map(50%) Reduce(10%)? Why Reducers Progress Percentage Is Displayed When Mapper Is Not Finished Yet?
• When Is The Reducers Are Started In A Mapreduce Job?
• What Is A Identitymapper And Identityreducer In Mapreduce ?
• What Is Writable & Writablecomparable Interface?
• What Are Combiners? When Should I Use A Combiner In My Mapreduce Job?
• Where Is The Mapper Output (intermediate Kay-value Data) Stored ?
• Can I Set The Number Of Reducers To Zero?
• Does Mapreduce Programming Model Provide A Way For Reducers To Communicate With Each Other? In A Mapreduce Job Can A Reducer Communicate With Another Reducer?
• How Namenode Handles Data Node Failures?
• What Is The Difference Between Hdfs And Nas ?