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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?
720How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
892If 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?
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Clarify what is shuffling in map reduce?
Where is the output of Mapper written in Hadoop?
Where sorting is done in Hadoop MapReduce Job?
Is there any point of learning mapreduce, then?
What combiners is and when you should use a combiner in a MapReduce Job?
Where is Mapper output stored?
What is Data Locality in Hadoop?
When is the reducers are started in a MapReduce job?
Is it necessary to write a mapreduce job in java?
How to configure the number of the Combiner in MapReduce?
What is the input type/format in MapReduce by default?
What can be optimum value for Reducer?
How to write MapReduce Programs?
How to change the name of the output file from part-r-00000 in Hadoop MapReduce?
Explain the input type/format in mapreduce by default?
