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How hadoop mapreduce works?
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What is the role of a MapReduce partitioner?
Name job control options specified by mapreduce.
Does Partitioner run in its own JVM or shares with another process?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
Is it mandatory to set input and output type/format in MapReduce?
What is the default input type in MapReduce?
What is a RecordReader in Hadoop MapReduce?
Explain Working of MapReduce?
What is MapReduce?
Define speculative execution?
Define Writable data types in MapReduce?
Explain what is the function of mapreduce partitioner?
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