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When is it suggested to use a combiner in a MapReduce job?
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How to get the single file as the output from MapReduce Job?
what are the three modes in which Hadoop can be run?
Difference between mapreduce and spark
What is the role of recordreader in hadoop mapreduce?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
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.
What happens when the node running the map task fails before the map output has been sent to the reducer?
Can MapReduce program be written in any language other than Java?
What is the difference between map and reduce?
Why comparison of types is important for MapReduce?
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What are mapreduce new and old apis while writing map reduce program?. Explain how it works
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