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how can you debug Hadoop code?
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.
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
Write a short note on the disadvantages of mapreduce
Explain the process of spilling in MapReduce?
Clarify what is shuffling in map reduce?
How to set mappers and reducers for MapReduce jobs?
Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?
What are the various InputFormats in Hadoop?
What do sorting and shuffling do?
List the configuration parameters that have to be specified when running a MapReduce job.
Why MapReduce uses the key-value pair to process the data?
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