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How many Mappers run for a MapReduce job in Hadoop?
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What is the inputsplit in map reduce software?
What is partitioner and its usage?
What is OutputCommitter?
What is Hadoop Map Reduce ?
What is identity mapper and chain mapper?
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 the difference between a MapReduce InputSplit and HDFS block?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
Explain what is “map” and what is "reducer" in hadoop?
What is the need of MapReduce?
What is the best way to copy files between HDFS clusters?
what are the basic parameters of a Mapper?
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