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Explain what does the conf.setMapper Class do in MapReduce?
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What is the input type/format in MapReduce by default?
what are the most common input formats defined in Hadoop?
What are the main components of MapReduce Job?
What does conf.setmapper class do?
What is an identity mapper and identity reducer?
What is reduce side join in mapreduce?
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?
Does Partitioner run in its own JVM or shares with another process?
What is difference between an input split and hdfs block?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
Explain the general mapreduce algorithm
In Map Reduce why map write output to Local Disk instead of HDFS?
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