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 is the difference between hbase and hadoop/hdfs?

177

When should you use hbase?

192

What is wal and hlog in hbase?

317

What is a cell in hbase?

190

What are the different types of filaters used in hbase?

195

How to create hadoop archive?

460

When should be hadoop archive create?

466

What mode(s) can hadoop code be run in?

493

How often do you need to reformat the namenode?

558

What is the role of the namenode?

499

What happen on the namenode when a client tries to read a data file?

507

What is replication factor?

489

If the hadoop administrator needs to make a change, which configuration file does he need to change?

497

What is distributed copy (distcp)?

530

What is the role of the secondary namenode?

487

Un-Answered Questions { Hadoop }

What all tasks you can perform for managing host using Ambari host tab?

What is a rack awareness algorithm and why is it used in hadoop?

When we are using queries instead of scripting?

771

What is the difference between python and spark?

295

What is Text Input Format?

718

Can you explain bloommapfile.

508

Explain how is hadoop different from other data processing tools?

770

What database does spark use?

290

Can you explain broadcast variables?

318

What is spark and what is its purpose?

286

What do you understand by column family?

100

How do you write your own custom SerDe ?

778

What is data skew and how do you fix it?

342

is HQL case sensitive?

902

How do Hadoop MapReduce works?

791

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