What happens when a datanode fails ?
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Is it possible to search for files using wildcards?
How can we assure that the values regarding a particular key goes to the same reducer?
What is the function of mapreduce partitioner?
What is shuffling in mapreduce?
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.
What is SequenceFileInputFormat in Hadoop MapReduce?
What do sorting and shuffling do?
Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?
Explain slot in Hadoop Map-Reduce v1?
What is Distributed Cache in the MapReduce Framework?
What is Mapper in Hadoop MapReduce?
What are the various configuration parameters required to run a mapreduce job?
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