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?

310

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

308

What is PageRank in Spark?

272

What are the drawbacks of Apache Spark?

317

Explain textFile Vs wholeTextFile in Spark?

434

Explain benefits of lazy evaluation in RDD in Apache Spark?

314

Explain first() operation in Apache Spark?

299

Explain Spark map() transformation?

358

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

322

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

287

Explain fullOuterJoin() operation in Apache Spark?

420

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

307

Explain coalesce operation in Apache Spark?

327

Explain the level of parallelism in spark streaming?

291

Explain join() operation in Apache Spark?

354

Un-Answered Questions { Hadoop }

What are the majorly used commands in sqoop?

What is executor memory in spark?

326

Define ttl in hbase?

164

Clarify what is shuffling in map reduce?

640

How can one check whether NameNode is working or not?

544

How can we create rdds in apache spark?

313

What is meant by Transformation? Give some examples.

311

Explain the core benefits for hadoop users by using the apache ambari?

What are the particular functionalities of Nagios in Ambari?

Are pig scripts support distributed file systems?

547

When is it suggested to use a combiner in a MapReduce job?

636

What is the difference between spark ml and spark mllib?

285

Explain what does hbase consists of?

159

What are the different composite keys in Cassandra?

Explain HCatLoader APIs?

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