how indexing in HDFS is done?
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mapper or reducer?
In MapReduce how to change the name of the output file from part-r-00000?
what is "map" and what is "reducer" in Hadoop?
What is RecordReader in a Map Reduce?
Mention what is the hadoop mapreduce apis contract for a key and value class?
What is the purpose of textinputformat?
What happens when a datanode fails ?
What are the configuration parameters in the 'MapReduce' program?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
what is a Task Tracker in Hadoop?
What is the need of MapReduce?
What is a MapReduce Combiner?
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