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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.
Describe what happens to a mapreduce job from submission to output?
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 are mapreduce new and old apis while writing map reduce program?. Explain how it works
When should you use a reducer?
Can you tell us how many daemon processes run on a hadoop system?
Difference between mapreduce and spark
What is identity mapper and identity reducer?
What is heartbeat in hdfs? Explain.
What is identity mapper and chain mapper?
Name job control options specified by mapreduce.
What is heartbeat in hdfs?
What is difference between an input split and hdfs block?
How do reducers communicate with each other?
How does inputsplit in mapreduce determines the record boundaries correctly?
