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How do you stop a running job gracefully?
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What is the role of recordreader in hadoop mapreduce?
When the reducers are are started in a mapreduce job?
Why Hadoop MapReduce?
What is a Distributed Cache in Hadoop?
What is the difference between Hadoop and RDBMS?
How does fault tolerance work in mapreduce?
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?
How to set the number of reducers?
Is reduce-only job possible in Hadoop MapReduce?
Illustrate a simple example of the working of MapReduce.
What is heartbeat in hdfs?
What is a MapReduce Combiner?
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