How data is spilt in Hadoop?
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What is Combiner in 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.
What do you understand by compute and storage nodes?
What is a "map" in Hadoop?
Explain what is “map” and what is "reducer" in hadoop?
What is Hadoop Map Reduce ?
What is the role of a MapReduce partitioner?
What do you understand by the term Straggler ?
mapper or reducer?
Detail description of the Reducer phases?
How can we assure that the values regarding a particular key goes to the same reducer?
What are the steps involved in MapReduce framework?
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