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Map reduce jobs take too long. What can be done to improve the performance of the cluster?
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When is it suggested to use a combiner in a MapReduce job?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
How to sort intermediate output based on values in MapReduce?
What is the role of a MapReduce partitioner?
Explain JobConf in MapReduce.
When is it not recommended to use MapReduce paradigm for large
What is the relation between MapReduce and Hive?
What is a distributed cache in mapreduce framework?
How to overwrite an existing output file during execution of mapreduce jobs?
Clarify what is shuffling in map reduce?
What is the best way to copy files between HDFS clusters?
Mention what is the next step after mapper or maptask?
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