How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
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Where sorting is done in Hadoop MapReduce Job?
What is partitioner and its usage?
What happens when the node running the map task fails before the map output has been sent to the reducer?
what daemons run on a master node and slave nodes?
What combiners is and when you should use a combiner in a MapReduce Job?
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Write a short note on the disadvantages of mapreduce
Explain JobConf in MapReduce.
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Define Writable data types in MapReduce?
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