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What is shuffling in mapreduce?
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Explain the Reducer's Sort phase?
What is the problem with the small file in Hadoop?
What is an identity mapper and identity reducer?
A number of combiners can be changed or not in MapReduce?
Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?
Describe what happens to a mapreduce job from submission to output?
How can you add the arbitrary key-value pairs in your mapper?
Is it mandatory to set input and output type/format in MapReduce?
Explain JobConf in MapReduce.
How to write a custom partitioner for a Hadoop MapReduce job?
How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?
For a Hadoop job, how will you write a custom partitioner?
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