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What is the difference between Hadoop and RDBMS?
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What happens when a datanode fails ?
What is the difference between HDFS block and input split?
How can you add the arbitrary key-value pairs in your mapper?
Is it possible to rename the output file?
What combiners is and when you should use a combiner in a MapReduce Job?
When should you use sequencefileinputformat?
What is the role of recordreader in hadoop mapreduce?
How can we assure that the values regarding a particular key goes to the same reducer?
Explain the Reducer's reduce phase?
What is SequenceFileInputFormat?
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 a "map" in Hadoop?
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