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What is a partitioner and how the user can control which key will go to which reducer?
How does Mappers run method works?
How does MapReduce framework view its input internally?
What are the steps involved in MapReduce framework?
What is the Job interface in MapReduce framework?
How to overwrite an existing output file during execution of mapreduce jobs?
Detail description of the Reducer phases?
Can there be no Reducer?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
What is the core of the job in MapReduce framework?
MapReduce Types and Formats and Setting up a Hadoop Cluster?
It can be possible that a Job has 0 reducers?
Why Mapreduce output written in local disk?
What is identity mapper and reducer? In which cases can we use them?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
