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Why can aggregation not be done in Mapper in MapReduce?


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More MapReduce Interview Questions

What is OutputCommitter?

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What are the various InputFormats in Hadoop?

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What is the difference between map and reduce?

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How to set mappers and reducers for MapReduce jobs?

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How does fault tolerance work in mapreduce?

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Explain task granularity

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how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

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Explain the process of spilling in Hadoop MapReduce?

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Explain the general mapreduce algorithm

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What are the main components of MapReduce Job?

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What is heartbeat in hdfs? Explain.

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Illustrate a simple example of the working of MapReduce.

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