MapReduce Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

MapReduce Interview Questions

Questions Answers Views Company eMail

What is difference between an input split and hdfs block?

694

How do reducers communicate with each other?

725

How does inputsplit in mapreduce determines the record boundaries correctly?

681

How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

720

What main configuration parameters are specified in mapreduce?

718

How do you stop a running job gracefully?

641

Is it necessary to write a mapreduce job in java?

661

What is shuffling and sorting in mapreduce?

686

What is the function of mapreducer partitioner?

674

What is partitioner and its usage?

744

Is there any point of learning mapreduce, then?

692

What is streaming?

727

What does conf.setmapper class do?

714

What are ‘maps’ and ‘reduces’?

742

What does a split do?

677

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Un-Answered Questions { MapReduce }

What is a partitioner and how the user can control which key will go to which reducer?

994

How to set mappers and reducers for Hadoop jobs?

652

what are the basic parameters of a Mapper?

862

Explain the Reducer's reduce phase?

1108

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

736

What is a map side join?

722

Is it mandatory to set input and output type/format in MapReduce?

787

How to create custom key and custom value in MapReduce Job?

648

Explain what is the function of mapreduce partitioner?

676

What are ‘reduces’?

762

How to get the single file as the output from MapReduce Job?

671

how indexing in HDFS is done?

892

What is shuffling in mapreduce?

651

How to set mappers and reducers for MapReduce jobs?

671

What combiners is and when you should use a combiner in a MapReduce Job?

670

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