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 Erasure Coding in Hadoop?

555

What is Disk Balancer in Hadoop?

570

How would you check whether your NameNode is working or not?

453

Is Namenode machine same as DataNode machine as in terms of hardware?

512

If DataNode increases, then do we need to upgrade NameNode?

591

What happens if the number of reducers is 0 in Hadoop?

518

Why is Data Block size set to 128 MB in Hadoop?

474

What is a Heartbeat in Hadoop?

615

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

556

What is a Backup node in Hadoop?

611

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

536

What is the default replication factor in Hadoop and how will you change it?

651

Why Hadoop performs replication, although it results in data redundancy?

1322

What is Balancer in Hadoop?

530

What is active and passive NameNode in Hadoop?

506

Un-Answered Questions { Hadoop }

What is Hadoop HDFS – Hadoop Distributed File System?

How can you implement machine learning in Spark?

297

What is zookeper?

How to optimize Hadoop MapReduce Job?

682

Explain the process for starting a kafka server?

564

Explain the key features of Spark.

303

What is scala and spark?

296

What are the tools that are used in ambari monitoring?

Are there any problems which can only be solved by MapReduce and cannot be solved by PIG? In which kind of scenarios MR jobs will be more useful than PIG?

825

Why not just use zookeeper for everything?

How do you do a file system check in hdfs?

Explain the Constituents of Apache ZooKeeper Architecture?

What is apache spark architecture?

335

What is a combiner and where you should use it?

726

In what ways sparksession different from sparkcontext?

360

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