what does the conf.setMapper Class do ?
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Describe what happens to a mapreduce job from submission to output?
Is there any point of learning mapreduce, then?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
What is a RecordReader in Hadoop MapReduce?
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.
What is difference between a MapReduce InputSplit and HDFS block
Define Writable data types in MapReduce?
Which Sorting algorithm is used in Hadoop MapReduce?
What is the default value of map and reduce max attempts?
Why comparison of types is important for MapReduce?
Illustrate a simple example of the working of MapReduce.
What is heartbeat in hdfs? Explain.