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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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What is heartbeat in hdfs? Explain.
Why do we need MapReduce during Pig programming?
When should you use a reducer?
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What are the various configuration parameters required to run a mapreduce job?
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what does the conf.setMapper Class do ?
Clarify what is shuffling in map reduce?
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Where sorting is done on mapper node or reducer node in MapReduce?
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