Can you tell us how many daemon processes run on a hadoop system?
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What is identity mapper and reducer? In which cases can we use them?
What is difference between an input split and hdfs block?
Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?
What is heartbeat in hdfs?
Explain the process of spilling in MapReduce?
A number of combiners can be changed or not in MapReduce?
Explain the Reducer's Sort phase?
What are the disservices of utilizing Apache Spark over Hadoop MapReduce?
what are the basic parameters of a Mapper?
Different ways of debugging a job in MapReduce?
Explain about the partitioning, shuffle and sort phase
What is LazyOutputFormat in MapReduce?
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