What combiners are and when you should use a combiner in a mapreduce job?
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How to set which framework would be used to run mapreduce program?
What happen if the number of the reducer is 0 in MapReduce?
How much space will the split occupy in Mapreduce?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
When Namenode is down what happens to job tracker?
Mention what is the hadoop mapreduce apis contract for a key and value class?
Explain what is “map” and what is "reducer" in hadoop?
What is heartbeat in hdfs? Explain.
Why do we need MapReduce during Pig programming?
What can be optimum value for Reducer?
In Hadoop, which file controls reporting in Hadoop?
How to specify more than one directory as input in the Hadoop MapReduce Program?
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