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Define Writable data types in MapReduce?
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Name job control options specified by mapreduce.
What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?
What is the need of MapReduce in Hadoop?
Clarify what is shuffling in map reduce?
What is shuffling and sorting in mapreduce?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
What do you mean by inputformat?
What counter in Hadoop MapReduce?
How does fault tolerance work in mapreduce?
What is a partitioner and how the user can control which key will go to which reducer?
What is a RecordReader in Hadoop MapReduce?
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
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