Where sorting is done on mapper node or reducer node in MapReduce?
What is the difference between Reducer and Combiner in Hadoop MapReduce?
What is a combiner and where you should use it?
How to specify more than one directory as input in the Hadoop MapReduce Program?
Explain what you understand by speculative execution
Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?
What is the fundamental difference between a MapReduce InputSplit and HDFS block?
Explain Working of MapReduce?
How to submit extra files(jars, static files) for MapReduce job during runtime?
What is OutputCommitter?
In Hadoop what is InputSplit?
Explain the process of spilling in Hadoop MapReduce?
Difference between mapreduce and spark