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What is the fundamental difference between a MapReduce InputSplit and HDFS block?
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Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
Why comparison of types is important for MapReduce?
What is the difference between a MapReduce InputSplit and HDFS block?
What is an identity mapper and identity reducer?
What is a RecordReader in Hadoop MapReduce?
Explain the Reducer's reduce phase?
What happens when a datanode fails ?
What combiners are and when you should utilize a combiner in a map reduce job?
what is NameNode in Hadoop?
For a job in Hadoop, is it possible to change the number of mappers to be created?
Mention what is the next step after mapper or maptask?
Define speculative execution?
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