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?

388

Explain what happens in text format?

526

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?

395

Explain what is webdav in hadoop?

475

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?

298

Un-Answered Questions { Hadoop }

What is a metastore in hive?

654

Mention what daemons run on a master node and slave nodes?

441

What is the difference between HDFS and NAS ?

1316

Why do we need spark?

260

What is the use of HColumnDescriptor class?

183

Define a commodity hardware? Does commodity hardware include ram?

699

What is azure spark?

281

What are the complex datatypes in pig?

923

What is a namenode in hadoop?

Clarify how hive de-serialize and serialize the information?

608

How to optimize MapReduce Job?

617

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

Describe Accumulator in detail in Apache Spark?

299

Explain the rudimentary difference between Cassandra and HBase?

What is the default file format to import data using Apache Sqoop?

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