Explain combiners.


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More MapReduce Interview Questions

Where the mapper's intermediate data will be stored?

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What is Output Format in MapReduce?

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Explain task granularity

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How to set which framework would be used to run mapreduce program?

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Explain the Reducer's reduce phase?

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Mention what are the main configuration parameters that user need to specify to run mapreduce job?

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what is a Task Tracker in Hadoop?

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Is reduce-only job possible in Hadoop 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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What are combiners? When should I use a combiner in my MapReduce Job?

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how indexing in HDFS is done?

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Explain what combiners are and when you should use a combiner in a mapreduce job?

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