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

Explain the basic architecture of Hadoop?

933

On what basis name node distribute blocks across the data nodes?

1060

Name some companies that use Hadoop?

Airtel,

955

what is hadoop archive?

922

Rack awareness of Namenode?

854

Have you ever used Counters in Hadoop. Give us an example scenario?

1063

How is the distance between two nodes defined in Hadoop?

1455

What is bucketing in Hive?

1 2066

What is speculative execution in Hadoop?

1051

How we can change Replication factor when Data is on the fly?

1343

What alternate way does HDFS provides to recover data in case a Namenode

955

What are the problems with Hadoop 1.0?

1048

what are the nodes in the Hadoop cluster?

1045

What are the differences between Hive and RDBMS?

1 2353

What Mapper does?

985

Un-Answered Questions { Hadoop }

What is accumulator in spark?

489

How to iterate all rows in ColumnFamily?

Do you know the comparative differences between apache spark and hadoop?

276

Explain the difference between COUNT_STAR and COUNT functions in Apache Pig?

769

What is shuffle in spark?

405

Explain the features of pseudo mode?

702

Is spark sql faster than hive?

287

Why is Cassandra popular? Clarify.

Which Sorting algorithm is used in Hadoop MapReduce?

599

What operations RDD support?

310

Does spark store data?

289

What is a pipelinedrdd?

435

Is hive similar to sql?

729

Is scala required for spark?

305

What does producer api in kafka?

489

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