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In Map Reduce why map write output to Local Disk instead of HDFS?
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What do you understand by the term Straggler ?
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.
Explain what are the basic parameters of a mapper?
what daemons run on a master node and slave nodes?
What is a "reducer" in Hadoop?
What can be optimum value for Reducer?
How to optimize Hadoop MapReduce Job?
How to overwrite an existing output file during execution of mapreduce jobs?
What does a 'MapReduce Partitioner' do?
Does Partitioner run in its own JVM or shares with another process?
What is Text Input Format?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
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