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Detail description of the Reducer phases?
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When should you use sequencefileinputformat?
Whether the output of mapper or output of partitioner written on local disk?
How to submit extra files(jars, static files) for MapReduce job during runtime?
What main configuration parameters are specified in mapreduce?
Can you tell us how many daemon processes run on a hadoop system?
Explain what is “map” and what is "reducer" in hadoop?
What is the next step after Mapper or MapTask?
what are the most common input formats defined in Hadoop?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
what is a Task Tracker in Hadoop?
What is an identity mapper and identity reducer?
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