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what are the three modes in which Hadoop can be run?
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What is a partitioner and how the user can control which key will go to which reducer?
What is the core of the job in MapReduce framework?
How to compress mapper output in Hadoop?
What is a map side join?
When Namenode is down what happens to job tracker?
What is Combiner in MapReduce?
What are the main configuration parameters in a MapReduce program?
What are the the issues associated with the map and reduce slots based mechanism in mapReduce?
How do reducers communicate with each other?
Define Writable data types in MapReduce?
Can we rename the output file?
how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
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