What is the difference between Job and Task in MapReduce?
What are the various InputFormats in Hadoop?
Why MapReduce uses the key-value pair to process the data?
What is Output Format in MapReduce?
How hadoop mapreduce works?
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 job does the conf class do?
How does inputsplit in mapreduce determines the record boundaries correctly?
Can we submit the mapreduce job from slave node?
What do sorting and shuffling do?
Explain the difference between a MapReduce InputSplit and HDFS block?
What is the difference between an RDBMS and Hadoop?
What is the need of MapReduce?
List out Hadoop's three configuration files?
In mapreduce what is a scarce system resource? Explain?