When should you use a reducer?
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how can you debug Hadoop code?
How to set the number of reducers?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
What are mapreduce new and old apis while writing map reduce program?. Explain how it works
How to create custom key and custom value in MapReduce Job?
When Namenode is down what happens to job tracker?
How many times combiner is called on a mapper node in Hadoop?
What is Output Format in MapReduce?
What is streaming?
what happens when Hadoop spawned 50 tasks for a job and one of the task failed?
What is Hadoop Map Reduce ?
What happens when the node running the map task fails before the map output has been sent to the reducer?
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