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What is identity mapper and reducer? In which cases can we use them?
Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?
What is the Hadoop MapReduce API contract for a key and value Class?
Explain the Reducer's Sort phase?
What can be optimum value for Reducer?
When is the reducers are started in a MapReduce job?
What is the input type/format in MapReduce by default?
What is the default value of map and reduce max attempts?
What is the Reducer used for?
What comes in Hadoop 2.0 and MapReduce V2 YARN
Why comparison of types is important for MapReduce?
What is the InputSplit in map reduce ?
In which scenario Pig is better fit than MapReduce?
What do you mean by a bag in Pig?
Different running modes for running Pig?
