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Why can aggregation not be done in Mapper in MapReduce?
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how indexing in HDFS is done?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
Where the mapper's intermediate data will be stored?
What is Distributed Cache in the MapReduce Framework?
Explain about the partitioning, shuffle and sort phase
What is identity mapper and chain mapper?
What are the advantages of using map side join in mapreduce?
What does a 'MapReduce Partitioner' do?
How to compress mapper output in Hadoop?
What can be optimum value for Reducer?
What is the relationship between Job and Task in Hadoop?
How to create custom key and custom value in MapReduce Job?
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