When should you use a reducer?
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Explain the process of spilling in MapReduce?
How data is spilt in Hadoop?
What is the need of MapReduce?
How to compress mapper output in Hadoop?
Mention what is the next step after mapper or maptask?
Explain what does the conf.setMapper Class do in MapReduce?
What are the data components used by Hadoop?
With the help of two examples name the map and reduce function purpose
When is it suggested to use a combiner in a MapReduce job?
How many Reducers run for a MapReduce job?
What do you understand by the term Straggler ?
What do you mean by inputformat?
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