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

MapReduce Interview Questions

Questions Answers Views Company eMail

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

765

In Map Reduce why map write output to Local Disk instead of HDFS?

756

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

742

How does Mappers run method works?

722

How does MapReduce framework view its input internally?

700

What are the steps involved in MapReduce framework?

755

What is the Job interface in MapReduce framework?

742

How to overwrite an existing output file during execution of mapreduce jobs?

MRO,

946

Detail description of the Reducer phases?

698

Can there be no Reducer?

701

What is the utility of using Writable Comparable Custom Class in Map Reduce code?

756

What is the core of the job in MapReduce framework?

674

MapReduce Types and Formats and Setting up a Hadoop Cluster?

754

It can be possible that a Job has 0 reducers?

752

Why Mapreduce output written in local disk?

745

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Un-Answered Questions { MapReduce }

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

556

How can you add the arbitrary key-value pairs in your mapper?

1266

what is WebDAV in Hadoop?

564

What are the configuration parameters in the 'MapReduce' program?

509

What do sorting and shuffling do?

529

Mention what is the hadoop mapreduce apis contract for a key and value class?

539

How to change a number of mappers running on a slave in MapReduce?

558

In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

486

What is InputFormat in Hadoop MapReduce?

474

what are the basic parameters of a Mapper?

639

Explain the input type/format in mapreduce by default?

451

What is shuffling and sorting in mapreduce?

478

What counter in Hadoop MapReduce?

485

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

601

How many Reducers run for a MapReduce job in Hadoop?

444

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