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 to process data using Transformation operation in Spark?

318

What is Resilient Distributed Dataset (RDD) in Apache Spark? How does it make spark operator rich?

304

What are the differences between Caching and Persistence method in Apache Spark?

323

Explain the operation reduce() in Spark?

310

Explain the lookup() operation in Spark?

245

Explain the processing speed difference between Hadoop and Apache Spark?

304

Explain the operation transformation and action in Apache Spark RDD?

348

Explain Spark join() operation?

296

How is RDD in Apache Spark different from Distributed Storage Management?

354

Explain various Apache Spark ecosystem components. In which scenarios can we use these components?

399

Explain Spark leftOuterJoin() and rightOuterJoin() operation?

313

List out the difference between textFile and wholeTextFile in Apache Spark?

420

What are the exact differences between reduce and fold operation in Spark?

465

Explain countByValue() operation in Apache Spark RDD?

286

Explain Spark countByKey() operation?

337

Un-Answered Questions { Hadoop }

How to specify more than one path for storage in Hadoop?

559

When do you call the cleanup method?

554

What are the network requirements for hadoop?

524

What is Safemode in Apache Hadoop?

781

Is hadoop required for data science?

732

What is distributed cache in spark?

364

Explain what is kafka?

572

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

335

What problem does Apache Pig solve?

843

What is the disadvantage of spark sql?

379

Explain Dsstream with reference to Apache Spark

408

Define the term ‘sparse vector.’

297

What is DStream in Apache Spark Streaming?

331

Where can the metastore database be hosted?

Explain about the different channel types in Flume.

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