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?

655

How do reducers communicate with each other?

664

How does inputsplit in mapreduce determines the record boundaries correctly?

646

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

655

What main configuration parameters are specified in mapreduce?

675

How do you stop a running job gracefully?

603

Is it necessary to write a mapreduce job in java?

625

What is shuffling and sorting in mapreduce?

642

What is the function of mapreducer partitioner?

615

What is partitioner and its usage?

688

Is there any point of learning mapreduce, then?

645

What is streaming?

680

What does conf.setmapper class do?

666

What are ‘maps’ and ‘reduces’?

695

What does a split do?

620

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Un-Answered Questions { MapReduce }

When should you use a reducer?

629

How do ‘map’ and ‘reduce’ work?

649

A number of combiners can be changed or not in MapReduce?

647

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

698

Can we submit the mapreduce job from slave node?

1104

What is the InputSplit in map reduce ?

1022

What is Text Input Format?

673

How many Mappers run for a MapReduce job in Hadoop?

610

How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

634

What happens when a DataNode fails during the write process?

638

What is the difference between HDFS block and input split?

886

How to specify more than one directory as input in the Hadoop MapReduce Program?

713

If 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?

711

What is heartbeat in hdfs?

645

Is there any point of learning mapreduce, then?

645

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