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Explain how mapreduce works.
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What is the difference between a MapReduce InputSplit and HDFS block?
mapper or reducer?
What is the need of MapReduce?
Difference between mapreduce and spark
What happens when the node running the map task fails before the map output has been sent to the reducer?
Is it mandatory to set input and output type/format in MapReduce?
How data is spilt in Hadoop?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
What is Mapper in Hadoop MapReduce?
How many Reducers run for a MapReduce job?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
Explain what is “map” and what is "reducer" in hadoop?
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