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What is difference between reducer and combiner?
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What are the restriction to the key and value class ?
How many maps are there in a particular job?
Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?
What are the primary phases of the reducer?
What is namenode?
What is LazyOutputFormat in Hadoop?
What are the major differences between Hadoop 2 and Hadoop 3?
What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?
What are the four basic parameters of a mapper?
Can we change the file cached by distributed cache
Are there any special requirements for namenode?
What are some of the characteristics of Hadoop framework?
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