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What is mapreduce algorithm?
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Explain what are the basic parameters of a mapper?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is the best way to copy files between HDFS clusters?
What is the Reducer used for?
How many Mappers run for a MapReduce job in Hadoop?
how can you debug Hadoop code?
What is partitioning in MapReduce?
Mention what is the next step after mapper or maptask?
what is the Hadoop MapReduce APIs contract for a key and value class?
What is the Job interface in MapReduce framework?
Whether the output of mapper or output of partitioner written on local disk?
What combiners are and when you should utilize a combiner in a map reduce job?
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