How do Hadoop MapReduce works?
What combiners are and when you should use a combiner in a mapreduce job?
what is distributed cache in mapreduce framework?
In Map Reduce why map write output to Local Disk instead of HDFS?
Explain the difference between a MapReduce InputSplit and HDFS block?
what does the conf.setMapper Class do ?
Define Writable data types in Hadoop MapReduce?
How does Mappers run method works?
What is the relationship between Job and Task in Hadoop?
What is partitioning in MapReduce?
when do reducers play their role in a mapreduce task?
What are the primary phases of a Reducer?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?