Explain what you understand by speculative execution
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What happens when the node running the map task fails before the map output has been sent to the reducer?
How many Reducers run for a MapReduce job?
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With the help of two examples name the map and reduce function purpose
What is the difference between HDFS block and input split?
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Explain Working of MapReduce?
It can be possible that a Job has 0 reducers?
what is a sequence file in Hadoop?
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