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

MapReduce Interview Questions

Questions Answers Views Company eMail

Where is Mapper output stored?

896

what is JobTracker in Hadoop? What are the actions followed by Hadoop?

819

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

1007

What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

924

Is it possible to rename the output file?

832

how JobTracker schedules a task ?

898

what is NameNode in Hadoop?

936

what does the conf.setMapper Class do ?

859

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

820

What is SequenceFileInputFormat?

859

What is a "map" in Hadoop?

834

What is a "reducer" in Hadoop?

914

what is Speculative Execution?

885

Explain JobConf in MapReduce.

848

What is OutputCommitter?

859

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Un-Answered Questions { MapReduce }

How to configure the number of the Combiner in MapReduce?

663

Explain slot in Hadoop Map-Reduce v1?

731

What is the Reducer used for?

975

What is the key- value pair in MapReduce?

838

How to specify more than one directory as input to the MapReduce Job?

735

How do you stop a running job gracefully?

641

How to create a custom key and custom value in MapReduce Job?

722

Define the Use of MapReduce?

713

Explain what combiners are and when you should use a combiner in a mapreduce job?

657

List the configuration parameters that have to be specified when running a MapReduce job.

640

what does the conf.setMapper Class do ?

859

What is a "reducer" in Hadoop?

914

What is a Speculative Execution in Hadoop MapReduce?

696

What is Counter in MapReduce?

725

Why Hadoop MapReduce?

698

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