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

MapReduce Interview Questions

Questions Answers Views Company eMail

How hadoop mapreduce works?

593

What is shuffling in mapreduce?

567

Can we rename the output file?

636

What do sorting and shuffling do?

641

Explain about the partitioning, shuffle and sort phase

629

What are the four basic parameters of a reducer?

612

what is distributed cache in mapreduce framework?

618

What is the inputsplit in map reduce software?

582

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

644

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

564

Can MapReduce program be written in any language other than Java?

878

How to set which framework would be used to run mapreduce program?

637

List out Hadoop's three configuration files?

553

Mention Hadoop core components?

612

What is RecordReader in a Map Reduce?

607

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Un-Answered Questions { MapReduce }

What is the best way to copy files between HDFS clusters?

631

What is Mapper in Hadoop MapReduce?

691

List out Hadoop's three configuration files?

553

Explain Working of MapReduce?

920

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

658

How many Mappers run for a MapReduce job in Hadoop?

570

Define Writable data types in Hadoop MapReduce?

599

How to compress mapper output in Hadoop?

632

How can we control particular key should go in a specific reducer?

862

What are combiners? When should I use a combiner in my MapReduce Job?

866

What is streaming?

625

What is the function of mapreducer partitioner?

561

how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

743

What are the data components used by Hadoop?

701

Explain how do ‘map’ and ‘reduce’ work?

577

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