What are the various input and output types supported by mapreduce?
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What happens when the node running the map task fails before the map output has been sent to the reducer?
Can we submit the mapreduce job from slave node?
What does a split do?
Explain the differences between a combiner and reducer
What is Text Input Format?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
How to overwrite an existing output file during execution of mapreduce jobs?
Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?
What is optimal size of a file for distributed cache?
What is the input type/format in MapReduce by default?
Explain the process of spilling in MapReduce?
What is map/reduce job in hadoop?
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