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It can be possible that a Job has 0 reducers?
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Whether the output of mapper or output of partitioner written on local disk?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
What is the difference between Reducer and Combiner in Hadoop MapReduce?
What are ‘maps’ and ‘reduces’?
Define Writable data types in Hadoop MapReduce?
What is the process of changing the split size if there is limited storage space on Commodity Hardware?
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?
How to submit extra files(jars, static files) for MapReduce job during runtime?
what happens when Hadoop spawned 50 tasks for a job and one of the task failed?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
What is the need of key-value pair to process the data in MapReduce?
What do you mean by inputformat?
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