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?

828

What is Hadoop Map Reduce ?

854

what does the text input format do?

855

What happens when a datanode fails ?

831

In Hadoop, which file controls reporting in Hadoop?

821

how can you debug Hadoop code?

885

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

828

What are the primary phases of a Reducer?

875

how indexing in HDFS is done?

892

What is the role of a MapReduce partitioner?

855

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

893

what job does the conf class do?

837

What is the key- value pair in Hadoop MapReduce?

722

What is InputFormat in Hadoop MapReduce?

716

What are the various InputFormats in Hadoop?

690

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Un-Answered Questions { MapReduce }

Write a Mapreduce Program for Character Count ?

1095

How to set the number of reducers?

1421

How many Mappers run for a MapReduce job?

654

What is shuffling in mapreduce?

651

List the network requirements for using Hadoop ?

662

Explain the input type/format in mapreduce by default?

618

In Hadoop what is InputSplit?

680

How data is spilt in Hadoop?

690

what are the main configuration parameters that user need to specify to run Mapreduce Job ?

649

Define Writable data types in MapReduce?

709

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

724

How does MapReduce framework view its input internally?

917

What is heartbeat in hdfs? Explain.

738

In mapreduce what is a scarce system resource? Explain?

708

Compare RDBMS with Hadoop MapReduce.

670

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