What is the difference between HDFS block and input split?
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What are the primary phases of a Reducer?
Can we rename the output file?
Which are the methods in the mapper interface?
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?
Is there any point of learning mapreduce, then?
Why comparison of types is important for MapReduce?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
When should you use sequencefileinputformat?
Explain what does the conf.setmapper class do?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
How do reducers communicate with each other?
What is partitioner and its usage?
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