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 TextInputFormat and KeyValueInputFormat class?

502

What is High Availability feature in Hadoop2?

447

What is the command to change the replication factor ?

509

What is JobTracker?

441

How many datanodes can run on a single Hadoop cluster?

458

What are some typical functions of Job Tracker?

433

What is TaskTracker?

489

Give a brief overview of Hadoop history?

422

How Big is ‘Big Data’?

431

How can you set an arbitrary number of mappers to be created for a job in Hadoop?

461

How many job tracker processes can run on a single Hadoop cluster?

479

What are some of the characteristics of Hadoop framework?

444

Where are Hadoop’s configuration files located?

512

Can you give a detailed overview about the Big Data being generated by Facebook?

442

How to remove safemode of namenode forcefully in HDFS?

Un-Answered Questions { Hadoop }

How does hdfs give great throughput?

Can you explain clustering in mahout?

What is the use of truncate command?

188

How does apache spark engine work?

315

What is zookeper?

How often do you need to reformat the namenode?

523

Why aggregation cannot be done in Mapper?

567

What is Pig Latin?

598

mapper or reducer?

1009

Where is kafka used?

548

Explain pipe() operation in Apache Spark?

311

What are the basic steps to writing a UDF Function in Pig?

706

In Hadoop, which file controls reporting in Hadoop?

780

Can hadoop handle streaming data?

467

Explain avrostorage function?

632

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