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What do you mean by shuffling and sorting in MapReduce?
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What is the function of mapreducer partitioner?
Explain what does the conf.setMapper Class do in MapReduce?
Can MapReduce program be written in any language other than Java?
Can you tell us how many daemon processes run on a hadoop system?
How to configure the number of the Combiner in MapReduce?
what are the most common input formats defined in Hadoop?
What are the data components used by Hadoop?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
Compare RDBMS with Hadoop MapReduce.
What is the default input type in MapReduce?
Explain the Reducer's reduce phase?
What is identity mapper and identity reducer?
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