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What is Output Format in MapReduce?
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What are the four basic parameters of a reducer?
What happens when a DataNode fails during the write process?
How many Mappers run for a MapReduce job in Hadoop?
What is a combiner and where you should use it?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
Explain the difference between a MapReduce InputSplit and HDFS block?
In MapReduce, ideally how many mappers should be configured on a slave?
How to submit extra files(jars, static files) for MapReduce job during runtime?
how to proceed to write your first mapreducer program?
What is a partitioner and how the user can control which key will go to which reducer?
How to create a custom key and custom value in MapReduce Job?
What is Reducer in MapReduce?
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