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?

644

What happens when a DataNode fails during the write process?

603

Compare RDBMS with Hadoop MapReduce.

585

what is a Task Tracker in Hadoop?

637

what are the most common input formats defined in Hadoop?

603

what daemons run on a master node and slave nodes?

656

What is Text Input Format?

626

what is WebDAV in Hadoop?

679

What platform and Java version is required to run Hadoop?

600

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

581

How data is spilt in Hadoop?

617

what is storage and compute nodes?

694

When Namenode is down what happens to job tracker?

641

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

577

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

597

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Un-Answered Questions { MapReduce }

What are the advantages of using mapreduce with hadoop?

552

Whether the output of mapper or output of partitioner written on local disk?

642

What is the fundamental difference between a MapReduce InputSplit and HDFS block?

583

What is the need of key-value pair to process the data in MapReduce?

618

In mapreduce what is a scarce system resource? Explain?

619

How data is spilt in Hadoop?

617

What happens if the quantity of the reducer is 0 in mapreduce?

558

Where sorting is done in Hadoop MapReduce Job?

611

Explain the Reducer's Sort phase?

839

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

672

A number of combiners can be changed or not in MapReduce?

596

In Hadoop what is InputSplit?

589

what is a Task Tracker in Hadoop?

637

What happen if the number of the reducer is 0 in MapReduce?

605

What is RecordReader in a Map Reduce?

606

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