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

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

668

What is the role of recordreader in hadoop mapreduce?

740

What happens when the node running the map task fails before the map output has been sent to the reducer?

655

Define speculative execution?

724

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

667

What are the advantages of using map side join in mapreduce?

650

What is a map side join?

692

What is a combiner and where you should use it?

666

When should you use sequencefileinputformat?

669

What is the purpose of textinputformat?

710

What is reduce side join in mapreduce?

620

What do you mean by inputformat?

622

What are the various configuration parameters required to run a mapreduce job?

663

What is a distributed cache in mapreduce framework?

614

What do you mean by data locality?

681

Un-Answered Questions { Hadoop }

What is rack awareness in hadoop?

493

Why apache spark is faster than hadoop?

386

What problems have you faced when you are working on Hadoop code?

980

If map reduce is inferior to spark then is there any benefit of learning it?

283

Explain the Job OutputFormat?

969

Is there any benefit of learning mapreduce if spark is better than mapreduce?

1813

What is Apache Spark Machine learning library?

320

What is Ambari shell?

Does Apache Flume provide support for third party plug-ins?

Name different types of NoSQL database?

Give some points of hive for hadoop ?

728

What is the difference between Pig and SQL?

646

Explain the core components of hadoop?

667

What is spark client?

279

Does impala use caching?

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