Explain the Reducer's Sort phase?
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What is the InputSplit in map reduce ?
Why MapReduce uses the key-value pair to process the data?
What is a "reducer" in Hadoop?
What is streaming?
What happens when the node running the map task fails before the map output has been sent to the reducer?
What is a combiner and where you should use it?
What does a split do?
Where is the output of Mapper written in Hadoop?
what is the Hadoop MapReduce APIs contract for a key and value class?
What happens when a datanode fails ?
Explain what is shuffling in mapreduce?
What is an identity mapper and identity reducer?
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