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What is mapper in map reduce?
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What is the next step after Mapper or MapTask?
What is the relationship between Job and Task in Hadoop?
What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?
Is it possible to rename the output file?
What is SequenceFileInputFormat?
Is it possible to split 100 lines of input as a single split in MapReduce?
What is partitioning in MapReduce?
For a Hadoop job, how will you write a custom partitioner?
How many InputSplits is made by a Hadoop Framework?
What are the data components used by Hadoop?
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?
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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