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What are the primary phases of a Reducer?
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What are the identity mapper and reducer in MapReduce?
What is a combiner and where you should use it?
What is the next step after Mapper or MapTask?
How many Mappers run for a MapReduce job in Hadoop?
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 combiners are and when you should use a combiner in a mapreduce job?
What is identity mapper and identity reducer?
What main configuration parameters are specified in mapreduce?
When is the reducers are started in a MapReduce job?
Why MapReduce uses the key-value pair to process the data?
Mention what is the next step after mapper or maptask?
Is YARN a replacement of Hadoop MapReduce?
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