What is the difference between a MapReduce InputSplit and HDFS block?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
Why comparison of types is important for MapReduce?
What is map/reduce job in hadoop?
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 the function of mapreduce partitioner?
What is RecordReader in a Map Reduce?
Compare Pig vs Hive vs Hadoop MapReduce?
What platform and Java version is required to run Hadoop?
What is the role of a MapReduce partitioner?
Where is Mapper output stored?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?