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What is the difference between Hadoop and RDBMS?
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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?
When is it suggested to use a combiner in a MapReduce job?
List the configuration parameters that have to be specified when running a MapReduce job.
Explain what does the conf.setMapper Class do in MapReduce?
Why can aggregation not be done in Mapper in MapReduce?
What is the default value of map and reduce max attempts?
Can there be no Reducer?
Where is Mapper output stored?
What is mapper in map reduce?
Clarify what is shuffling in map reduce?
what is a Task Tracker in Hadoop?
Explain how mapreduce works.
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