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

Big Data Interview Questions

Questions Answers Views Company eMail

What is a IdentityMapper and IdentityReducer in MapReduce ?

1005

Explain Working of MapReduce?

1036

Write a Mapreduce Program for Character Count ?

1102

how to proceed to write your first mapreducer program?

1428

How to set the number of reducers?

1427

Developing a MapReduce Application?

1028

Different ways of debugging a job in MapReduce?

1160

Explain the Reducer's reduce phase?

1117

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2842

What are the functions of NameNode?

1 2062

How to configure hadoop to reuse JVM for mappers?

1241

mapper or reducer?

1048

How to resolve IOException: Cannot create directory

1076

Does Pig support multi-line commands?

939

How to change replication factor of files already stored in HDFS?

1041

Un-Answered Questions { Big Data }

Define the consistency levels for read operations in Cassandra?

What is the difference between persist() and cache()?

335

What do you understand by logging in cassandra?

What is the next step after Mapper or MapTask?

700

Why we use intwritable instead of int? Why we use longwritable instead of long?

536

What is difference between cache and persist in spark?

291

Is it necessary to know java to learn hadoop?

712

Can NameNode and DataNode be a commodity hardware?

1738

Name the examples of some companies that are using hadoop structure?

730

What is a heartbeat in HDFS?

977

What are the ways to create RDDs in Apache Spark? Explain.

328

What are the different math functions available in Pig?

560

What are the DDL commands used in hbase?

156

How many partitions are created by default in Apache Spark RDD?

319

What is difference between spark and hadoop?

274

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