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?

610

What is shuffling in mapreduce?

574

Can we rename the output file?

647

What do sorting and shuffling do?

652

Explain about the partitioning, shuffle and sort phase

641

What are the four basic parameters of a reducer?

623

what is distributed cache in mapreduce framework?

629

What is the inputsplit in map reduce software?

593

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

652

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

575

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

888

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

652

List out Hadoop's three configuration files?

564

Mention Hadoop core components?

623

What is RecordReader in a Map Reduce?

618

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Un-Answered Questions { MapReduce }

What is Data Locality in Hadoop?

624

What comes in Hadoop 2.0 and MapReduce V2 YARN

971

What are the steps involved in MapReduce framework?

941

How to sort intermediate output based on values in MapReduce?

637

What happen if the number of the reducer is 0 in MapReduce?

612

What is mapreduce algorithm?

565

When should you use a reducer?

598

What is the difference between Reducer and Combiner in Hadoop MapReduce?

637

what is a Task Tracker in Hadoop?

653

what are the three modes in which Hadoop can be run?

591

What do you understand by the term Straggler ?

645

What is heartbeat in hdfs? Explain.

651

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

646

How to optimize MapReduce Job?

626

Write a short note on the disadvantages of mapreduce

573

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