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What do sorting and shuffling do?
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What is identity mapper and identity reducer?
How to set the number of mappers for a MapReduce job?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
Explain combiners.
Define speculative execution?
Can you tell us how many daemon processes run on a hadoop system?
What is an identity mapper and identity reducer?
what does the text input format do?
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 need of MapReduce in Hadoop?
In MapReduce, ideally how many mappers should be configured on a slave?
What are ‘maps’ and ‘reduces’?
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