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

MapReduce Interview Questions

Questions Answers Views Company eMail

How is reporting controlled in hadoop?

781

What is Hadoop Map Reduce ?

804

what does the text input format do?

814

What happens when a datanode fails ?

777

In Hadoop, which file controls reporting in Hadoop?

772

how can you debug Hadoop code?

837

For a job in Hadoop, is it possible to change the number of mappers to be created?

784

What are the primary phases of a Reducer?

822

how indexing in HDFS is done?

854

What is the role of a MapReduce partitioner?

805

Is it important for Hadoop MapReduce jobs to be written in Java?

844

what job does the conf class do?

787

What is the key- value pair in Hadoop MapReduce?

678

What is InputFormat in Hadoop MapReduce?

665

What are the various InputFormats in Hadoop?

649

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Un-Answered Questions { MapReduce }

What is difference between a MapReduce InputSplit and HDFS block

674

What is a "reducer" in Hadoop?

869

What is a RecordReader in Hadoop MapReduce?

675

What is the role of recordreader in hadoop mapreduce?

733

What happens when a datanode fails ?

777

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

988

How many Reducers run for a MapReduce job in Hadoop?

590

What is the purpose of textinputformat?

703

what happens in textinformat ?

666

How to optimize MapReduce Job?

648

What is shuffling and sorting in Hadoop MapReduce?

624

What is reduce side join in mapreduce?

613

What is the data storage component used by Hadoop?

619

Is it possible to split 100 lines of input as a single split in MapReduce?

963

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

824

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