Does Partitioner run in its own JVM or shares with another process?
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Explain the difference between a MapReduce InputSplit and HDFS block?
How can we control particular key should go in a specific reducer?
What is identity mapper and chain mapper?
Where is Mapper output stored?
In Map Reduce why map write output to Local Disk instead of HDFS?
What is Data Locality in Hadoop?
How do reducers communicate with each other?
Mention what is the next step after mapper or maptask?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
Difference between mapreduce and spark
What do you understand by the term Straggler ?
what does the text input format do?
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