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?

948

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

945

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

994

How does Mappers run method works?

939

How does MapReduce framework view its input internally?

917

What are the steps involved in MapReduce framework?

1042

What is the Job interface in MapReduce framework?

951

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

MRO,

1129

Detail description of the Reducer phases?

897

Can there be no Reducer?

872

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

1045

What is the core of the job in MapReduce framework?

897

MapReduce Types and Formats and Setting up a Hadoop Cluster?

955

It can be possible that a Job has 0 reducers?

1002

Why Mapreduce output written in local disk?

1058

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Un-Answered Questions { MapReduce }

When is it not recommended to use MapReduce paradigm for large

688

How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

656

What is the role of a MapReduce partitioner?

855

Is it possible to search for files using wildcards?

687

What is the key- value pair in MapReduce?

838

What is shuffling and sorting in mapreduce?

686

What is a scarce system resource?

708

How to write a custom partitioner for a Hadoop MapReduce job?

693

What is difference between an input split and hdfs block?

694

Difference between mapreduce and spark

733

Does Partitioner run in its own JVM or shares with another process?

756

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

820

Explain what are the basic parameters of a mapper?

861

What is a mapreduce algorithm?

701

What are ‘reduces’?

762

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