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?

287

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?

375

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?

443

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?

364

Un-Answered Questions { Hadoop }

Does Pig give any warning when there is a type mismatch or missing field?

942

What is a parquet file?

304

How we can check hadoop sqoop installed or not in a system?

What is the use of foreach operation in Pig scripts?

629

What is Apache Cassandra?

Can you explain the term, Cassandra?

109

What is Cassandra Data Modelling ?

100

What all tasks you can perform for managing services using Ambari service tab?

Who developed Apache Avro?

How does data transfer happen from hdfs to hive?

155

What is a combiner and where you should use it?

718

Explain about the major libraries that constitute the Spark Ecosystem?

433

what is a sequence file in Hadoop?

732

What do we mean by Paraquet?

461

What are input format, input split & record reader and what they do?

665

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