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What are mapreduce new and old apis while writing map reduce program?. Explain how it works
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What MapReduce framework consists of?
How to optimize MapReduce Job?
How many Reducers run for a MapReduce job?
what is "map" and what is "reducer" in Hadoop?
Is it important for Hadoop MapReduce jobs to be written in Java?
Can we set the number of reducers to zero in MapReduce?
How to configure the number of the Combiner in MapReduce?
What is Combiner in MapReduce?
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?
For a job in Hadoop, is it possible to change the number of mappers to be created?
When Namenode is down what happens to job tracker?
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