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 MapReduce?

1 1742

What MapReduce framework consists of?

1056

Can we submit the mapreduce job from slave node?

1048

How can we control particular key should go in a specific reducer?

861

How can you add the arbitrary key-value pairs in your mapper?

1384

What is Reduce only jobs?

1 1619

What is a IdentityMapper and IdentityReducer in MapReduce ?

899

Explain Working of MapReduce?

918

Write a Mapreduce Program for Character Count ?

1002

how to proceed to write your first mapreducer program?

1303

How to set the number of reducers?

1311

Developing a MapReduce Application?

896

Different ways of debugging a job in MapReduce?

1057

Explain the Reducer's reduce phase?

1007

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2676

Un-Answered Questions { Hadoop }

What is a databricks cluster?

361

What are the main features of impala?

What happen if the number of the reducer is 0 in MapReduce?

602

Some of the most notable applications of Kafka?

484

Explain the process to trigger automatic clean-up in Spark to manage accumulated metadata.

286

What are the differences between Caching and Persistence method in Apache Spark?

297

Can We Change settings within Hive Session? If Yes, How?

707

What are the features of spark rdd?

275

Can we change the file cached by distributed cache

392

What the information segments utilized by hadoop are?

377

What are Replication Tool and its types?

533

Explain data flow in Flume?

How do you specify the table creator name when creating a table in hive?

645

List the functions of Spark SQL?

464

How is indexing done in Hadoop HDFS?

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