Difference between mapreduce and spark
Why MapReduce uses the key-value pair to process the data?
How many Reducers run for a MapReduce job in Hadoop?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
What is optimal size of a file for distributed cache?
For a Hadoop job, how will you write a custom partitioner?
how Hadoop is different from other data processing tools?
Is it possible to search for files using wildcards?
What is partitioning in MapReduce?
Explain how mapreduce works.
MapReduce Types and Formats and Setting up a Hadoop Cluster?
What is Shuffling and Sorting in a MapReduce?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
What is the difference between Hadoop and RDBMS?
Define Writable data types in Hadoop MapReduce?