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?

322

Explain the operation reduce() in Spark?

309

Explain the lookup() operation in Spark?

245

Explain the processing speed difference between Hadoop and Apache Spark?

302

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?

397

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?

464

Explain countByValue() operation in Apache Spark RDD?

284

Explain Spark countByKey() operation?

337

Un-Answered Questions { Hadoop }

Hadoop sqoop is which type of tool?

Define replication factor?

102

How can we import data from particular row or column? What is the destination types allowed in Sqoop import command?

What do you mean by the NameNode High Availability in hadoop?

530

What is the difference between HDFS and NAS ?

1420

Mention what is the number of default partitioner in Hadoop?

744

Specify what the information segments utilized by hadoop are?

468

How can I install Cloudera VM in my system?

1015

How to sort intermediate output based on values in MapReduce?

692

How to copy file from HDFS to local?

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

752

What is yarn in hadoop?

716

how can we access the sub directories recursively?

844

How is 0xdata's h2o different from apache mahout ?

How can you connect an application, if you run hive as a server?

754

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