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Is it important for Hadoop MapReduce jobs to be written in Java?
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Mention what is the next step after mapper or maptask?
What is map/reduce job in hadoop?
Explain what does the conf.setmapper class do?
Can we set the number of reducers to zero in MapReduce?
Can there be no Reducer?
What combiners are and when you should use a combiner in a mapreduce job?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
What is the difference between map and reduce?
What is the problem with the small file in Hadoop?
How to set mappers and reducers for MapReduce jobs?
What are the identity mapper and reducer in MapReduce?
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