How to set the number of mappers for a MapReduce job?
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What is the difference between a MapReduce InputSplit and HDFS block?
Explain about the partitioning, shuffle and sort phase
How to set mappers and reducers for Hadoop jobs?
List the network requirements for using Hadoop ?
In Map Reduce why map write output to Local Disk instead of HDFS?
What is a combiner and where you should use it?
How do ‘map’ and ‘reduce’ work?
What are the various InputFormats in Hadoop?
What is the role of a MapReduce partitioner?
How to change the name of the output file from part-r-00000 in Hadoop MapReduce?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
Explain combiners.
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