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What is a Speculative Execution in Hadoop MapReduce?
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What are the identity mapper and reducer in MapReduce?
What is the purpose of textinputformat?
What is Reducer in MapReduce?
Whether the output of mapper or output of partitioner written on local disk?
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?
Why is output file name in Hadoop MapReduce part-r-00000?
What happens when the node running the map task fails before the map output has been sent to the reducer?
How do ‘map’ and ‘reduce’ work?
Explain the general mapreduce algorithm
how JobTracker schedules a task ?
what are the most common input formats defined in Hadoop?
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