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How to optimize Hadoop MapReduce Job?
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What is optimal size of a file for distributed cache?
What are mapreduce new and old apis while writing map reduce program?. Explain how it works
What is Reduce only jobs?
Is it mandatory to set input and output type/format in MapReduce?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
what is a sequence file in Hadoop?
Mention Hadoop core components?
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?
What is MapReduce in Hadoop?
What is identity mapper and identity reducer?
what is storage and compute nodes?
How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?
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