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

Mention how many inputsplits is made by a hadoop framework?

577

Explain what is jobtracker in hadoop? What are the actions followed by hadoop?

407

Explain is it possible to search for files using wildcards?

478

Explain what is hadoop?

434

Explain what is sequencefileinputformat?

456

Mention how hadoop is different from other data processing tools?

409

Mention what are the most common input formats defined in hadoop?

442

Mention what is rack awareness?

381

Mention what is the difference between an rdbms and hadoop?

424

Mention what are the three modes in which hadoop can be run?

419

Explain how does hadoop classpath plays a vital role in stopping or starting in hadoop daemons?

614

Explain what is storage and compute nodes?

512

Explain how jobtracker schedules a task?

465

Explain what happens when hadoop spawned 50 tasks for a job and one of the task failed?

439

What happens in text format?

436

Un-Answered Questions { Hadoop }

Is spark a programming language?

293

What is the difference between piglatin and hiveql?

655

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

666

In a very huge text file, you want to just check if a particular keyword exists. How would you do this using Spark?

404

What is dag – directed acyclic graph?

300

What are the machine learning algorithms supports in apache mahout?

115

How data or file is read in Hadoop HDFS?

What do you understand by node in cassandra?

How to add column in apache tajo?

Tell something about the query language used in Cassandra Database?

Explain the basic difference between traditional rdbms and hadoop?

653

How are file systems checked in hdfs?

Define replication strategy?

What is a block in HDFS, why block size 64MB?

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1214

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