Mention what is the next step after mapper or maptask?
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What is a "reducer" in Hadoop?
How to set the number of reducers?
When Namenode is down what happens to job tracker?
What is the problem with the small file in Hadoop?
what does the text input format do?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
How does Mappers run method works?
How to set the number of mappers for a MapReduce job?
what are the basic parameters of a Mapper?
what is Speculative Execution?
What counter in Hadoop MapReduce?
What is the input type/format in MapReduce by default?
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