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 map transformation do? Provide an example.

332

What are the different ways of representing data in Spark?

287

What are the features of Spark?

305

What are shared variables in Apache Spark?

341

What are the various libraries available on top of Apache Spark?

326

Explain the operations of Apache Spark RDD?

302

What are the limitations of Apache Spark?

295

State the difference between persist() and cache() functions.

333

What is Directed Acyclic Graph(DAG)?

329

What are Actions? Give some examples.

330

What is the difference between DSM and RDD?

316

What do you mean by Persistence?

330

How to create a Sparse vector from a dense vector?

374

What are common uses of Apache Spark?

311

In a very huge text file, you want to just check if a particular keyword exists. How would you do this using Spark?

416

Un-Answered Questions { Hadoop }

How does one create RDDs in Spark?

298

Use of Codegen command in Hadoop sqoop?

What does ambari shell can provide?

What is a databricks cluster?

396

Is JDBC driver enough to connect sqoop to the databases?

How to change a number of mappers running on a slave in MapReduce?

842

Which one is the master node in HDFS? Can it be commodity hardware?

Mention what is the benefits of apache kafka over the traditional technique?

663

What is off heap memory in spark?

326

Does spark use hive?

288

What is the difference between TextInputFormat and KeyValueInputFormat class?

547

Features of Kafka Stream?

556

How to debug Hadoop code?

576

What are core components of Flume?

104

What do you understand by worker node?

295

For More Un-Answered { Hadoop } Questions Click Here