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?

445

Explain what is a task tracker in hadoop?

452

Explain what is speculative execution?

423

Explain what happens in text format?

573

Mention what is distributed cache in hadoop?

440

Explain how can you debug hadoop code?

466

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

431

Explain what is webdav in hadoop?

508

Mention what job does the conf class do?

422

For using hadoop list the network requirements?

471

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

141

What are the main key structures of hbase?

167

What is the use of hbase hmaster?

149

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

173

Explain what is wal and hlog in hbase?

312

Un-Answered Questions { Hadoop }

Explain Hadoop streaming?

476

What port does spark use?

316

When is it not recommended to use MapReduce paradigm for large

647

What problem does Apache Flume solve?

101

What causes sparks?

293

What is the use of map transformation?

313

What is the functionality of Query Processor in Apached Hive ?

708

How to format the HDFS? How frequently it will be done?

Explain the wordcount implementation via hadoop framework ?

724

Replication causes data redundancy then why is is pursued in HDFS?

What is a generic udf in hive?

734

how Cassandra writes changed data into commitlog?

Is bigger than spark driver maxresultsize?

296

How is recovery achieved in Ambari?

When is the reducers are started in a MapReduce job?

864

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