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What is the difference between Reducer and Combiner in Hadoop MapReduce?


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More MapReduce Interview Questions

What is difference between a MapReduce InputSplit and HDFS block

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What is map/reduce job in hadoop?

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how JobTracker schedules a task ?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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What are the key differences between Pig vs MapReduce?

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What is the InputSplit in map reduce ?

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what is "map" and what is "reducer" in Hadoop?

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What is the process of changing the split size if there is limited storage space on Commodity Hardware?

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Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

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What is a "map" in Hadoop?

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It can be possible that a Job has 0 reducers?

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What combiners is and when you should use a combiner in a MapReduce Job?

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