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mapper or reducer?
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Is YARN a replacement of Hadoop MapReduce?
How many numbers of reducers run in Map-Reduce Job?
What is the data storage component used by Hadoop?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
When Namenode is down what happens to job tracker?
What MapReduce framework consists of?
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
How to change a number of mappers running on a slave in MapReduce?
What is an identity mapper and identity reducer?
Explain what is “map” and what is "reducer" in hadoop?
Explain about the basic parameters of mapper and reducer function
What is MapReduce? What are the syntax you use to run a MapReduce program?
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