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What is a IdentityMapper and IdentityReducer in MapReduce ?
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How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
What is map/reduce job in hadoop?
What are combiners? When should I use a combiner in my MapReduce Job?
Is there any point of learning mapreduce, then?
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?
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how can you check whether Namenode is working beside using the jps command?
What is the next step after Mapper or MapTask?
How does MapReduce framework view its input internally?
Differentiate Reducer and Combiner in Hadoop MapReduce?
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