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

What are the restriction to the key and value class ?

433

If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

665

If datanodes increase, then do we need to upgrade namenode?

467

Which object can be used to get the progress of a particular job

472

Give me examples of unstructured data?

483

Explain the core methods of the reducer?

515

How to handle bad records during parsing?

453

What is the use of context object?

466

What happens if number of reducers are 0?

470

What are the primary phases of the reducer?

459

what is next step after mapper or maptask?

431

What is a rack?

423

Do we require two servers for the namenode and the datanodes?

528

We have already sql then why nosql?

426

What is difference between reducer and combiner?

569

Un-Answered Questions { Hadoop }

What is the importance of — the split-by clause in running parallel import tasks in sqoop?

What are the most memory-intensive operations?

Why is HDFS only suitable for large data sets and not the correct tool to use for many small files?

What is the bottom layer of abstraction in the Spark Streaming API ?

799

Does spark require hadoop?

290

Differentiate Reducer and Combiner in Hadoop MapReduce?

684

How hive can improve performance with orc format tables?

720

What daemons run on master nodes?

490

Can you use Spark to access and analyse data stored in Cassandra databases?

372

Can you mention some features of spark?

320

Developing a MapReduce Application?

971

Can you explain data versioning?

172

What is Apache Cassandra?

Explain about the different cluster managers in Apache Spark

330

Which one will you choose for a project –Hadoop MapReduce or Apache Spark?

317

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