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Mention what is the hadoop mapreduce apis contract for a key and value class?
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What is difference between an input split and hdfs block?
What happens when a DataNode fails during the write process?
what is "map" and what is "reducer" in Hadoop?
Explain what you understand by speculative execution
When is the reducers are started in a MapReduce job?
How is mapreduce related to cloud computing?
What are the steps involved in MapReduce framework?
Explain what is the function of mapreduce partitioner?
What do you understand by the term Straggler ?
Is it mandatory to set input and output type/format in MapReduce?
What happens when the node running the map task fails before the map output has been sent to the reducer?
How to set the number of mappers for a MapReduce job?
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