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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

What does ‘jps’ command do?

695

Mention what is the use of Context Object?

721

What is commodity hardware?

659

Explain what is sqoop in Hadoop ?

726

Explain how do ‘map’ and ‘reduce’ works?

738

Explain what is the purpose of RecordReader in Hadoop?

745

How to restart Namenode?

747

Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

762

Mention what are the data components used by Hadoop?

659

What does /etc /init.d do?

700

What is a Combiner?

741

Main Components of Hadoop?

769

What are the four characteristics of Big Data?

715

Mention what is the number of default partitioner in Hadoop?

694

Explain what happens in textinformat ?

748

Un-Answered Questions { Hadoop }

How many compaction types are in HBase?

181

how JobTracker schedules a task ?

850

What is difference between spark and scala?

263

What are the different commands used to startup and shutdown Hadoop daemons?

527

When should you use cassandra?

Compare Spark vs Hadoop MapReduce

330

What is spark client?

277

What is the latest version of sqoop?

What are shared variables?

332

Define "Transformations" in Spark

336

How to optimize Hadoop MapReduce Job?

632

Is hadoop open source?

718

is HQL case sensitive?

860

If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

149

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

782

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