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 how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

403

Explain what is a task tracker in hadoop?

391

Explain what is speculative execution?

386

Explain what happens in text format?

525

Mention what is distributed cache in hadoop?

401

Explain how can you debug hadoop code?

434

Explain how can you check whether namenode is working beside using the jps command?

392

Explain what is webdav in hadoop?

474

Mention what job does the conf class do?

389

For using hadoop list the network requirements?

424

Explain deletion in hbase? Mention what are the three types of tombstone markers in hbase?

137

What are the main key structures of hbase?

162

What is the use of hbase hmaster?

141

Which technique can you use in hbase to access hfile directly without the help of hbase?

169

Explain what is wal and hlog in hbase?

297

Un-Answered Questions { Hadoop }

Define a namenode?

611

What are the different types of tables available in Hive?

649

How is rdd distributed?

301

What are the Benefits Of Zookeeper?

Why is Transformation lazy in Spark?

324

How does apache spark engine work?

285

How many ways can you create rdd in spark?

304

Mention what job does the conf class do?

389

What is Cassandra-CQL collection?

Explain what is the role of the zookeeper?

463

How will you update the rows that are already exported?

What is heartbeat in hdfs?

612

what is difference between int and intwritable?

1408

What is apache spark for beginners?

265

What is the default extension of the files produced from a sqoop import using the –compress parameter?

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