In Map Reduce why map write output to Local Disk instead of HDFS?
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How does MapReduce framework view its input internally?
Explain what does the conf.setmapper class do?
What is LazyOutputFormat in MapReduce?
What happens when a datanode fails ?
When is the reducers are started in a MapReduce job?
What is mapper in map reduce?
when do reducers play their role in a mapreduce task?
What combiners are and when you should utilize a combiner in a map reduce job?
What is identity mapper and chain mapper?
What happen if the number of the reducer is 0 in MapReduce?
Explain what you understand by speculative execution
Why Mapreduce output written in local disk?
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