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What is heartbeat in hdfs? Explain.
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Define Writable data types in MapReduce?
Is it mandatory to set input and output type/format in MapReduce?
What are the key differences between Pig vs MapReduce?
What are the various configuration parameters required to run a mapreduce job?
How many numbers of reducers run in Map-Reduce Job?
What comes in Hadoop 2.0 and MapReduce V2 YARN
What is a "map" in Hadoop?
What is the role of a MapReduce partitioner?
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?
Where sorting is done in Hadoop MapReduce Job?
what is NameNode in Hadoop?
What is the core of the job in MapReduce framework?
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