What are the primary phases of a Reducer?
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Which are the methods in the mapper interface?
What is a map side join?
what does the text input format do?
how can you check whether Namenode is working beside using the jps command?
How can we assure that the values regarding a particular key goes to the same reducer?
For a Hadoop job, how will you write a custom partitioner?
Is it mandatory to set input and output type/format in MapReduce?
What is a IdentityMapper and IdentityReducer in MapReduce ?
What is the input type/format in MapReduce by default?
How to change a number of mappers running on a slave in MapReduce?
How do reducers communicate with each other?
How to set the number of mappers for a MapReduce job?
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