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Why do we need MapReduce during Pig programming?
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what are the most common input formats defined in Hadoop?
What are the main components of MapReduce Job?
How to specify more than one directory as input in the Hadoop MapReduce Program?
What is difference between an input split and hdfs block?
What is map/reduce job in hadoop?
what does the conf.setMapper Class do ?
Explain JobConf in MapReduce.
What is identity mapper and identity reducer?
How does MapReduce framework view its input internally?
What is identity mapper and chain mapper?
How to compress mapper output in Hadoop?
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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