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?

509

How would you restart NameNode?

395

How NameNode tackle Datanode failures in Hadoop?

442

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

402

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

426

What is meant by streaming access?

512

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

484

What is Mapper in Hadoop?

515

What is Reducer in Hadoop?

515

What are the most common InputFormats in Hadoop?

555

Explain InputSplit in Hadoop?

440

What is the purpose of RecordReader in hadoop?

451

What is Combiner in Hadoop?

502

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

431

Why aggregation cannot be done in Mapper?

531

Un-Answered Questions { Hadoop }

What is the purpose of exploding in hive?

631

What are the components of Apache Pig platform?

720

Describe coalesce() operation. When can you coalesce to a larger number of partitions? Explain.

310

Discuss the various running mode of Apache Spark?

283

What is the use of ycsb?

173

Explain what is a cluster in cassandra?

Mention what is the hadoop mapreduce apis contract for a key and value class?

646

How to setup the local repository manually?

Does google use hadoop?

625

What is cluster in Cassandra?

What are the particular functionalities of Ganglia in Ambari?

Does Hive support record level Insert, delete or update?

647

What is Purpose to Validate in Sqoop?

What is scala and spark?

261

What are active and passive "NameNodes"?

1407

For More Un-Answered { Hadoop } Questions Click Here