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 Hadoop MapReduce?

638

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

699

What is shuffling and sorting in Hadoop MapReduce?

625

Define the Use of MapReduce?

664

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

671

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

698

Explain the process of spilling in MapReduce?

597

What is LazyOutputFormat in MapReduce?

683

What is Output Format in MapReduce?

694

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

617

What are the identity mapper and reducer in MapReduce?

780

How to optimize Hadoop MapReduce Job?

631

How to specify more than one directory as input in the Hadoop MapReduce Program?

713

How to change the name of the output file from part-r-00000 in Hadoop MapReduce?

650

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

613

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Un-Answered Questions { MapReduce }

What are the primary phases of a Reducer?

822

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

676

What are the main components of MapReduce Job?

679

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

599

Explain the Reducer's Sort phase?

882

What is the use of InputFormat in MapReduce process?

650

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

626

Can we rename the output file?

685

Define Writable data types in Hadoop MapReduce?

638

how indexing in HDFS is done?

854

What can be optimum value for Reducer?

946

how can you check whether Namenode is working beside using the jps command?

663

What is a combiner and where you should use it?

661

What does a split do?

620

What is the key- value pair in MapReduce?

774

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