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?

533

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

369

Explain is it possible to search for files using wildcards?

428

Explain what is hadoop?

402

Explain what is sequencefileinputformat?

410

Mention how hadoop is different from other data processing tools?

374

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

411

Mention what is rack awareness?

356

Mention what is the difference between an rdbms and hadoop?

386

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

387

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

577

Explain what is storage and compute nodes?

474

Explain how jobtracker schedules a task?

426

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

397

What happens in text format?

414

Un-Answered Questions { Hadoop }

What is identity mapper and chain mapper?

621

What does apache spark do?

300

What is map in apache spark?

254

What is document store db? Explain with an example.

what are the key components of hbase?

163

Explain leftOuterJoin() and rightOuterJoin() operation in Apache Spark?

374

Differentiate Reducer and Combiner in Hadoop MapReduce?

624

When should you use cassandra?

How does rdd work in spark?

275

Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

404

Is it possible to leverage real time analysis on the big data collected by flume directly? If yes, then explain how?

Name some AVRO Reference APIs?

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

328

How HDFS client divide the file into the block while storing inside HDFS?

In a given spark program, how will you identify whether a given operation is Transformation or Action ?

312

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