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Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
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how indexing in HDFS is done?
How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?
How do reducers communicate with each other?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
Explain the process of spilling in Hadoop MapReduce?
What is optimal size of a file for distributed cache?
How do you stop a running job gracefully?
How hadoop mapreduce works?
How does fault tolerance work in mapreduce?
What is a "map" in Hadoop?
What is a Speculative Execution in Hadoop MapReduce?
What is Reduce only jobs?
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