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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
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What is mapper in map reduce?
Whether the output of mapper or output of partitioner written on local disk?
What are the various input and output types supported by mapreduce?
What is sqoop in Hadoop ?
What is the key- value pair in MapReduce?
What is a IdentityMapper and IdentityReducer in MapReduce ?
Explain how do ‘map’ and ‘reduce’ work?
Explain JobConf in MapReduce.
What is a partitioner and how the user can control which key will go to which reducer?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?
What is the best way to copy files between HDFS clusters?
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