Explain the difference between a MapReduce InputSplit and HDFS block?
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How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
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?
Describe what happens to a mapreduce job from submission to output?
What are mapreduce new and old apis while writing map reduce program?. Explain how it works
How to optimize MapReduce Job?
Is it possible to rename the output file?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
Why can aggregation not be done in Mapper in MapReduce?
what does the conf.setMapper Class do ?
How to optimize Hadoop MapReduce Job?
In MapReduce, ideally how many mappers should be configured on a slave?
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