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?

782

What is Hadoop Map Reduce ?

805

what does the text input format do?

815

What happens when a datanode fails ?

778

In Hadoop, which file controls reporting in Hadoop?

774

how can you debug Hadoop code?

838

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

785

What are the primary phases of a Reducer?

823

how indexing in HDFS is done?

855

What is the role of a MapReduce partitioner?

806

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

845

what job does the conf class do?

788

What is the key- value pair in Hadoop MapReduce?

679

What is InputFormat in Hadoop MapReduce?

666

What are the various InputFormats in Hadoop?

650

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Un-Answered Questions { MapReduce }

What is partitioning in MapReduce?

717

Explain the input type/format in mapreduce by default?

579

Explain the general mapreduce algorithm

646

What is the key- value pair in MapReduce?

779

When is it not recommended to use MapReduce paradigm for large

646

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

What does a split do?

621

How many Reducers run for a MapReduce job in Hadoop?

590

What are the advantages of using mapreduce with hadoop?

590

What is a "map" in Hadoop?

793

Compare Pig vs Hive vs Hadoop MapReduce?

675

What comes in Hadoop 2.0 and MapReduce V2 YARN

1003

How many times combiner is called on a mapper node in Hadoop?

643

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

964

What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

645

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