What are ‘maps’ and ‘reduces’?
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Explain what is “map” and what is "reducer" in hadoop?
How do Hadoop MapReduce works?
Explain the general mapreduce algorithm
For a Hadoop job, how will you write a custom partitioner?
Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?
What happens when a datanode fails ?
What is the difference between HDFS block and input split?
What are the four basic parameters of a reducer?
How to optimize MapReduce Job?
Difference between mapreduce and spark
Is reduce-only job possible in Hadoop MapReduce?
What is shuffleing in mapreduce?
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