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

MapReduce Interview Questions

Questions Answers Views Company eMail

Define Writable data types in MapReduce?

709

What happens when a DataNode fails during the write process?

694

Compare RDBMS with Hadoop MapReduce.

670

what is a Task Tracker in Hadoop?

744

what are the most common input formats defined in Hadoop?

695

what daemons run on a master node and slave nodes?

749

What is Text Input Format?

711

what is WebDAV in Hadoop?

785

What platform and Java version is required to run Hadoop?

692

what are the three modes in which Hadoop can be run?

671

How data is spilt in Hadoop?

690

what is storage and compute nodes?

788

When Namenode is down what happens to job tracker?

753

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

649

what is "map" and what is "reducer" in Hadoop?

681

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Un-Answered Questions { MapReduce }

what is Speculative Execution?

885

What are the key differences between Pig vs MapReduce?

655

How to compress mapper output in Hadoop?

732

What is a TaskInstance?

705

Can MapReduce program be written in any language other than Java?

970

How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

675

In MapReduce how to change the name of the output file from part-r-00000?

667

How to get the single file as the output from MapReduce Job?

671

Where is Mapper output stored?

896

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

689

What is partitioner and its usage?

744

What is a IdentityMapper and IdentityReducer in MapReduce ?

990

Define MapReduce?

737

How does Mappers run method works?

939

how to proceed to write your first mapreducer program?

1413

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