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What is the data storage component used by Hadoop?
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What do you mean by shuffling and sorting in MapReduce?
What is Counter in MapReduce?
What is the difference between HDFS block and input split?
What do you know about nlineinputformat?
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
What combiners are and when you should use a combiner in a mapreduce job?
A number of combiners can be changed or not in MapReduce?
What is the Hadoop MapReduce API contract for a key and value Class?
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?
Explain InputSplit in Hadoop MapReduce?
Mention when to use Map reduce mode?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
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