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?

307

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

283

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

313

Explain the operation reduce() in Spark?

288

Explain the lookup() operation in Spark?

231

Explain the processing speed difference between Hadoop and Apache Spark?

294

Explain the operation transformation and action in Apache Spark RDD?

328

Explain Spark join() operation?

288

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

342

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

381

Explain Spark leftOuterJoin() and rightOuterJoin() operation?

300

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

403

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

450

Explain countByValue() operation in Apache Spark RDD?

269

Explain Spark countByKey() operation?

321

Un-Answered Questions { Hadoop }

Do we need to install spark in all nodes?

278

What is an "Accumulator"?

283

What is a rack awareness algorithm?

What is Hive Data Definition language?

977

What is mahout hadoop?

What are the different Complex Data Types available in Hive?

909

What is the use of ycsb?

173

Explain Hadoop Archives?

540

What is the reason for creating a new metastore_db whenever Hive query is run from a different directory?

992

Have you ever used counters in hadoop?

421

How do you process big data with spark?

283

Does cassandra support acid tractions?

Why does my insert statement fail?

Which data storage components are used by hadoop?

672

What is gossip protocol in Cassandra?

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