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?

546

What is High Availability feature in Hadoop2?

482

What is the command to change the replication factor ?

551

What is JobTracker?

482

How many datanodes can run on a single Hadoop cluster?

487

What are some typical functions of Job Tracker?

481

What is TaskTracker?

524

Give a brief overview of Hadoop history?

468

How Big is ‘Big Data’?

463

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

504

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

518

What are some of the characteristics of Hadoop framework?

489

Where are Hadoop’s configuration files located?

551

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

484

How to remove safemode of namenode forcefully in HDFS?

Un-Answered Questions { Hadoop }

How is 0xdata's h2o different from apache mahout ?

State the difference between persist() and cache() functions.

333

What is Mapper? How can we compress Mapper output in Hadoop?

559

Should we use RAID in Hadoop or not?

1112

Explain the use of tasktracker in the hadoop cluster?

683

How many types of nosql databases?

Explain tomap function?

631

Mention what are the data components used by Hadoop?

695

How can we see only top 15 records from the student.txt out of100 records in the HDFS directory?

620

What are the components of Hive architecture?

1158

How is RDD in Apache Spark different from Distributed Storage Management?

354

What are the basic available commands in Hadoop sqoop ?

1012

What is ng in flume?

101

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

585

In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

697

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