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MapReduce Interview Questions
Questions Answers Views Company eMail

What is identity mapper and reducer? In which cases can we use them?

448

Is YARN a replacement of Hadoop MapReduce?

1 903

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

563

What is the Hadoop MapReduce API contract for a key and value Class?

763

Explain the Reducer's Sort phase?

335

What can be optimum value for Reducer?

304

When is the reducers are started in a MapReduce job?

297

What is the input type/format in MapReduce by default?

488

What is the default value of map and reduce max attempts?

369

What is the Reducer used for?

380

What comes in Hadoop 2.0 and MapReduce V2 YARN

401

Why comparison of types is important for MapReduce?

387

What is the InputSplit in map reduce ?

441

what are the basic parameters of a Mapper?

207

What is a MapReduce Combiner?

234


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Un-Answered Questions { MapReduce }

What do you mean by data locality?

94


What main configuration parameters are specified in mapreduce?

134


What do you understand by the term Straggler ?

114


What is a MapReduce Combiner?

234


What is partitioning in MapReduce?

102






What is Text Input Format?

107


For a Hadoop job, how will you write a custom partitioner?

98


Explain the differences between a combiner and reducer

100


Explain what is shuffling in mapreduce?

84


Which are the methods in the mapper interface?

90


What is the need of MapReduce?

93


What is the difference between an RDBMS and Hadoop?

114


What is the purpose of textinputformat?

85


How do you stop a running job gracefully?

85


how JobTracker schedules a task ?

238