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

How can one check whether NameNode is working or not?

542

How would you restart NameNode?

422

How NameNode tackle Datanode failures in Hadoop?

463

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

436

If DataNode increases, then do we need to upgrade NameNode in Hadoop?

454

What is meant by streaming access?

546

How to add/delete a Node to the existing cluster?

524

What is Mapper in Hadoop?

555

What is Reducer in Hadoop?

549

What are the most common InputFormats in Hadoop?

591

Explain InputSplit in Hadoop?

460

What is the purpose of RecordReader in hadoop?

482

What is Combiner in Hadoop?

534

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

451

Why aggregation cannot be done in Mapper?

560

Un-Answered Questions { Hadoop }

Would you be able to change the block size of hdfs files?

Does spark require hadoop?

286

What are the types of cluster managers in spark?

282

What is the bag?

533

What purpose would an engineer use spark?

407

Difference between hive and impala?

727

Define Simple Strategy?

128

Clarify how hive de-serialize and serialize the information?

643

When a large data set is maintained?

715

Write a Pig UDF Example ?

767

What are the main components of MapReduce Job?

680

Difference between cassandra and mongodb?

Explain the role of offset in kafka?

516

What is the role of CQLSH?

How to use Hive using the command line and Beeline?

943

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