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What is difference between reducer and combiner?
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Explain InputSplit in Hadoop?
What is TextInputFormat in Hadoop?
What is job tracker role in hadoop?
What happens when two clients try to access the same file in the hdfs?
What is a combiner in hadoop?
What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?
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What is streaming access?
Is it possible to have hadoop job output in multiple directories? If yes, how?
Mention what is rack awareness?
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