What is the Job interface in MapReduce framework?
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Explain the differences between a combiner and reducer
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
Whether the output of mapper or output of partitioner written on local disk?
What are combiners? When should I use a combiner in my MapReduce Job?
What is a distributed cache in mapreduce framework?
What is the need of MapReduce?
mapper or reducer?
how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
what is storage and compute nodes?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
What is the data storage component used by Hadoop?
How many Reducers run for a MapReduce job?
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