when do reducers play their role in a mapreduce task?
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What happens when a datanode fails ?
Explain how do ‘map’ and ‘reduce’ work?
Where the mapper's intermediate data will be stored?
What is shuffling and sorting in mapreduce?
what is NameNode in Hadoop?
What is the Reducer used for?
Where sorting is done in Hadoop MapReduce Job?
What is a partitioner and how the user can control which key will go to which reducer?
What is the difference between a MapReduce InputSplit and HDFS block?
What is a MapReduce Combiner?
What is map/reduce job in hadoop?
What is the process of changing the split size if there is limited storage space on Commodity Hardware?
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