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Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
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Mention what is the hadoop mapreduce apis contract for a key and value class?
How to set the number of reducers?
Developing a MapReduce Application?
What is an identity mapper and identity reducer?
What happens when the node running the map task fails before the map output has been sent to the reducer?
when do reducers play their role in a mapreduce task?
What is Data Locality in Hadoop?
What are the various configuration parameters required to run a mapreduce job?
Different ways of debugging a job in MapReduce?
When is it not recommended to use MapReduce paradigm for large scale data processing?
Explain the process of spilling in MapReduce?
What happens when a datanode fails ?
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