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Which Sorting algorithm is used in Hadoop MapReduce?
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what is the Hadoop MapReduce APIs contract for a key and value class?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
what daemons run on a master node and slave nodes?
What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
how can you check whether Namenode is working beside using the jps command?
What is optimal size of a file for distributed cache?
Is it possible to search for files using wildcards?
What is the difference between Hadoop and RDBMS?
It can be possible that a Job has 0 reducers?
What is SequenceFileInputFormat?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
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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