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

Explain the flatMap() transformation in Apache Spark?

320

What is RDD lineage graph? How does it enable fault-tolerance in Spark?

327

What is PageRank in Spark?

289

What are the drawbacks of Apache Spark?

338

Explain textFile Vs wholeTextFile in Spark?

440

Explain benefits of lazy evaluation in RDD in Apache Spark?

331

Explain first() operation in Apache Spark?

315

Explain Spark map() transformation?

376

What are the types of transformation in RDD in Apache Spark?

336

Why is transformation lazy operation in Apache Spark RDD? How is it useful?

302

Explain fullOuterJoin() operation in Apache Spark?

447

How many partitions are created by default in Apache Spark RDD?

319

Explain coalesce operation in Apache Spark?

343

Explain the level of parallelism in spark streaming?

300

Explain join() operation in Apache Spark?

365

Un-Answered Questions { Hadoop }

Which command is used for the retrieval of the status of daemons running the hadoop cluster?

749

What are the file formats that Hive supports and can use be used for storage?

914

What is dag – directed acyclic graph?

319

Explain the Reducer's reduce phase?

1116

Why is Kafka technology significant to use?

557

What is the difference between piglatin and hiveql?

708

What kind of hardware is best for hadoop?

466

On what basis name node distribute blocks across the data nodes in HDFS?

What is the Physical plan in pig architecture?

575

What is write ahead log(journaling) in Spark?

443

What combiners is and when you should use a combiner in a MapReduce Job?

675

What is the role of “ambari-qa” user?

How is rdd fault?

298

What is the purpose of sqoop-merge?

What is the row key?

161

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