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How many Reducers run for a MapReduce job?


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More MapReduce Interview Questions

What is a map side join?

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What is the purpose of textinputformat?

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Does Partitioner run in its own JVM or shares with another process?

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Different ways of debugging a job in MapReduce?

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what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

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Mention what is the hadoop mapreduce apis contract for a key and value class?

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What do you mean by data locality?

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Define the purpose of the partition function in mapreduce framework

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If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

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Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

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Explain the Reducer's Sort phase?

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Why comparison of types is important for MapReduce?

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