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How many Reducers run for a MapReduce job?
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What is a map side join?
What is the purpose of textinputformat?
Does Partitioner run in its own JVM or shares with another process?
Different ways of debugging a job in MapReduce?
what happens when Hadoop spawned 50 tasks for a job and one of the task failed?
Mention what is the hadoop mapreduce apis contract for a key and value class?
What do you mean by data locality?
Define the purpose of the partition function in mapreduce framework
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?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
Explain the Reducer's Sort phase?
Why comparison of types is important for MapReduce?
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