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What is the Job interface in MapReduce framework?
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What do you understand by compute and storage nodes?
What is LazyOutputFormat in MapReduce?
What is heartbeat in hdfs?
What is SequenceFileInputFormat in Hadoop MapReduce?
Why can aggregation not be done in Mapper in MapReduce?
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?
what is the Hadoop MapReduce APIs contract for a key and value class?
Explain what is shuffling in mapreduce?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
What is the difference between HDFS block and input split?
How many times combiner is called on a mapper node in Hadoop?
what are the basic parameters of a Mapper?
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