Explain what does the conf.setmapper class do?
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What happen if the number of the reducer is 0 in MapReduce?
Explain what is distributed cache in mapreduce framework?
Explain what is “map” and what is "reducer" in hadoop?
What is a IdentityMapper and IdentityReducer in MapReduce ?
Why MapReduce uses the key-value pair to process the data?
when do reducers play their role in a mapreduce task?
what does the conf.setMapper Class do ?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
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 Text Input Format?
List out Hadoop's three configuration files?
How to optimize MapReduce Job?
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