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How do reducers communicate with each other?
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What is an identity mapper and identity reducer?
What combiners is and when you should use a combiner in a MapReduce Job?
Why do we need MapReduce during Pig programming?
Where the mapper's intermediate data will be stored?
What is the relationship between Job and Task in Hadoop?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
What are the main components of MapReduce Job?
Explain about the basic parameters of mapper and reducer function
What is the next step after Mapper or MapTask?
A number of combiners can be changed or not in MapReduce?
Compare RDBMS with Hadoop MapReduce.
What is a partitioner and how the user can control which key will go to which reducer?
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