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?

172

When should you use hbase?

186

What is wal and hlog in hbase?

307

What is a cell in hbase?

179

What are the different types of filaters used in hbase?

193

How to create hadoop archive?

425

When should be hadoop archive create?

437

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

465

How often do you need to reformat the namenode?

523

What is the role of the namenode?

460

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

472

What is replication factor?

437

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

449

What is distributed copy (distcp)?

489

What is the role of the secondary namenode?

450

Un-Answered Questions { Hadoop }

What is the role of the kafka producer api.

538

What is KeyValueTextInputFormat in Hadoop?

538

What are the differences between relational databases and impala?

Write a query to insert a new column(new_col int) into a hiev table (htab) at a position before an existing column (x_col)

797

What load do concurrent queries produce on the namenode?

What is output format in hadoop?

693

Why should we use ‘orderby’ keyword in pig scripts?

546

Define the term ‘sparse vector.’

283

What is spark parallelize?

321

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

1285

List out some key features of apache cassandra?

What are the features and characteristics of Apache Spark?

289

How to create a custom key and custom value in MapReduce Job?

684

How can native libraries be included in yarn jobs?

488

Define catalog tables in HBase?

215

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