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Explain what you understand by speculative execution


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More MapReduce Interview Questions

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

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Write a Mapreduce Program for Character Count ?

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What is streaming?

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How hadoop mapreduce works?

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Can there be no Reducer?

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What is identity mapper and identity reducer?

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What is the key- value pair in Hadoop MapReduce?

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How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

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Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

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In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

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What combiners are and when you should utilize a combiner in a map reduce job?

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what daemons run on a master node and slave nodes?

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