How to set the number of mappers for a MapReduce job?
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When Namenode is down what happens to job tracker?
Define the purpose of the partition function in mapreduce framework
What are the primary phases of a Reducer?
What is the difference between HDFS block and input split?
What combiners is and when you should use a combiner in a MapReduce Job?
What is the Reducer used for?
When is it not recommended to use MapReduce paradigm for large scale data processing?
Why Mapper runs in heavy weight process and not in a thread in MapReduce?
What is shuffling and sorting in Hadoop 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?
Developing a MapReduce Application?
What are ‘maps’ and ‘reduces’?
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