Explain what combiners are and when you should use a combiner in a mapreduce job?
Is YARN a replacement of Hadoop MapReduce?
What is the difference between RDBMS with Hadoop MapReduce?
What is Combiner in MapReduce?
What is Counter in MapReduce?
What is OutputCommitter?
How to set the number of mappers to be created in MapReduce?
Name job control options specified by mapreduce.
Compare RDBMS with Hadoop MapReduce.
Can you tell us how many daemon processes run on a hadoop system?
Mention Hadoop core components?
What is identity mapper and chain mapper?
when do reducers play their role in a mapreduce task?